1: Tubes Asylum, Thanks, Jim, I always appreciate your insights. (nt) (0.00)
Posted by radiance on 2006-12-08, 16:37:04 (68.3.102.14)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

2: Tubes Asylum, Re: Newbie bias voltmeter readings question (0.00)
Posted by radiance on 2006-12-06, 11:12:05 (68.3.102.14)
you gotta find out if you're supposed to measure millivolts and TRANSLATE millivolts into milliamps, or whether you've been given true milliamp reading points. If you're measuring across a 1 ohm resis .......

3: Tubes Asylum, OK, if that's true, then you're right. First time I've heard it. (nt) (0.00)
Posted by radiance on 2006-12-06, 10:01:53 (68.3.102.14)
thanks, one less thing to worry about "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I wi .......

4: Tubes Asylum, oh, the Eico has germanium diodes...never mind... (0.00)
Posted by radiance on 2006-12-05, 23:20:42 (68.3.102.14)
never mind. i guess. unless when the germanium diodes burn out I'll need an eliminator... "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 .......

5: Tubes Asylum, the voice of experience, very good to know. thanks! (nt) (0.00)
Posted by radiance on 2006-12-05, 20:02:03 (68.3.102.14)
thanks, that's very useful information. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I .......

6: Tubes Asylum, Re: Cathode stripping - an urban legend? (0.00)
Posted by radiance on 2006-12-05, 19:31:57 (68.3.102.14)
Goddamittohell, yeah, 5AR4, not 5V4, didn't know there was a difference in warm-up time. I agree, the only way to settle this confusing mess is some destructive testing; I know damn well I read that i .......

7: Tubes Asylum, Thanks, Ray, I didn't realize the rectifier tube.... (0.00)
Posted by radiance on 2006-12-05, 11:23:49 (68.3.102.14)
....heats up more slowly than the others... or maybe it's that even though it heats up at the same rate, the B+ comes on softly, so cathode stripping doesn't occur anyway... in either case, I see now .......

8: Tubes Asylum, Jim, I'm delighted to find out about your 83 eliminator.... (0.00)
Posted by radiance on 2006-12-04, 22:42:04 (68.3.102.14)
....I had no idea! I have an Eico 635 tube tester, and I never gave it a second's thought! As soon as I read your post I ran into my shop and unplugged it! I've been in the habit of just leaving it co .......

9: Tubes Asylum, Re: What would make one output tube go bright cherry red!! too much drama (0.00)
Posted by radiance on 2006-12-04, 22:12:13 (68.3.102.14)
Hi Jim, Yeah, I think you're right, I think it's biasing. I think everyone talking about a defective tube are probably barking up the wrong tree. I have made a bit of a specialty around modding AA-151 .......

10: Tubes Asylum, thanks guys, but this is a little different......... (0.00)
Posted by radiance on 2006-12-04, 21:55:31 (68.3.102.14)
.......in this particular case I have a secondary that is dedicated to just the rectifier tube, so I have an opportunity here to delay B+ by just delaying the low voltage to the rectifier filament ins .......

11: Tubes Asylum, quick question: is it OK to delay B+ by delaying switching on of rectifier... (0.00)
Posted by radiance on 2006-12-04, 10:41:48 (68.3.102.14)
....filament? What I would like to do with these Heathkit AA-151's I'm modding is have a B+ delay, and in looking at the schematic it seems to me the easiest (lowest voltage) place to accomplish this .......

12: Tubes Asylum, Re: any feedback on ebay seller heyroy444? (0.00)
Posted by radiance on 2006-11-20, 11:22:41 (68.3.102.14)
would rather have the vintage equipment than just the tubes! The problem with this kind of stuff on ebay is unfortunately a lot of people have the bad habit of saving bad tubes after they replace them .......

13: Tubes Asylum, Re: fleshy midrange prominent 12AT7 (0.00)
Posted by radiance on 2006-11-20, 09:42:04 (68.3.102.14)
can I ask a dumb question? What about rather than rolling tubes to get what you want, you mod the circuit or add equalization? It just seems to me that the key is in the circuit, not the tube. It seem .......

14: Tubes Asylum, re verntisdale archives (0.00)
Posted by radiance on 2006-11-20, 09:39:26 (68.3.102.14)
Yeah, thanks, maybe it's me or my computer, but even when I print them out at original size and use a magnifying glass, I can't make out the tube labels on these scans, or a lot of other detail. I'm r .......

15: Tubes Asylum, Thanks, Jim, I think the mystery tube is a 6SN7 after all; I think... (0.00)
Posted by radiance on 2006-11-19, 21:48:40 (68.3.102.14)
I'll check the filament voltages for that socket and if it is 6.3 V then go ahead and fire up the remote amp with a 6SN7 in place and see wuhappens, but for the main amp I see that there are some plug .......

16: Tubes Asylum, corrections to original post (0.00)
Posted by radiance on 2006-11-19, 14:32:11 (68.3.102.14)
1. The remote speaker amp, the rsa1-l6, takes two 6L6's not 1619's, got that straightened out now. Still don't know what goes in the mystery socket, but probably a 6SN7... 2. Take back what I said abo .......

17: Tubes Asylum, anyone know the tubes for two Seeburg juke box amps.... (0.00)
Posted by radiance on 2006-11-19, 13:34:20 (68.3.102.14)
I have two: The MA1-L6 main amp and the Remote Speaker amp RSA1-L6. Unfortunately, the socket labels are painted over with black paint (from the factory?), so I'm piecing together what tubes go where .......

18: Tube DIY Asylum, Re: I did it, I finally finished my DHT preamp... (0.00)
Posted by radiance on 2006-11-09, 19:49:54 (68.3.102.14)
Nice! I like both the outside and the very cool cut-outs you did on the bottom. It's not a commercial look, but so what? That's not the point, the point is you made something for yourself the way you .......

19: Tube DIY Asylum, Re: Resistor break-in: how is this possible? (0.00)
Posted by radiance on 2006-11-09, 19:35:11 (68.3.102.14)
how do you know the resistance hasn't changed? more to the point, probably, however, is how do you know the frequency response hasnt' changed? I have recently been astonished at how much frequency res .......

20: Tube DIY Asylum, appreciate advice on spectrum analyzer esp PC based (0.00)
Posted by radiance on 2006-11-09, 19:19:29 (68.3.102.14)
I found this PC based spectrum analyzer on ebay: http://cgi.ebay.com/DIGITAL-PC-SCOPE-SPECTRUM-ANALYZER-RECORDER-NEW_W0QQitemZ160047957792QQihZ006QQcategoryZ104247QQcmdZViewItem It's about $250; does .......

21: Tube DIY Asylum, Hi Russ. How do you feel about the tradeoff of.... (0.00)
Posted by radiance on 2006-10-26, 23:14:44 (68.3.102.14)
...more distortion in an air-gapped SET OPT but the "magic" of SE vs. less distortion in a non-air-gapped PP OPT but odd-numbered harmonics left over after cancellation of even-numbered? in other word .......

22: Tube DIY Asylum, now, that's a cool idea. hmmmmmm...thanks! (nt) (0.00)
Posted by radiance on 2006-10-26, 23:11:00 (68.3.102.14)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

23: Tube DIY Asylum, found a great article! link in text. (0.00)
Posted by radiance on 2006-10-26, 23:09:38 (68.3.102.14)
http://sound.westhost.com/appnotes/an001.htm whoever these people are, they're great. the internet is changing EVERYTHING. as long as we can keep it free and open. thanks for the search tip. best, cha .......

24: Tube DIY Asylum, coolness. I will look it up. thanks! (nt) (0.00)
Posted by radiance on 2006-10-26, 23:05:27 (68.3.102.14)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

25: Tube DIY Asylum, yeah, I agree, I have the same kit.... (0.00)
Posted by radiance on 2006-10-24, 22:47:53 (68.3.102.14)
....the only change I plan to make when I get the time to put it together is to use poly in oil caps to replace the electrolytics, otherwise I advise putting it together stock. It's a fine amp just th .......

26: Tubes Asylum, Re: Youv'e already done the test! case closed!! Next!! (NT) (0.00)
Posted by radiance on 2006-10-24, 22:34:23 (68.3.102.14)
Eli, thanks. Good points, esp about iron, that's for sure. the way I have it sorted out now for me personally is tube rectification with oil/poly caps for hifi and guitar audio, SS with electrolytics .......

27: General Asylum, Re: That is what I said. The store owner/employee is NOT a UPS employee. (0.00)
Posted by radiance on 2006-10-24, 22:28:23 (68.3.102.14)
the UPS store in my area is run by kids who are either stoned or bored out of their gourds, I'm not sure which. I brought in three packages, two to Australia, one to Canada, the kid gave me three piec .......

28: Tube DIY Asylum, Re: how to use a triode or triodes to frequency double in audio range? (0.00)
Posted by radiance on 2006-10-24, 22:15:54 (68.3.102.14)
Jeff, thanks. Ah, right, that's the idea with overdrive in guitar amps; when negative feedback is used hugely to compress before overdriving, the overdrive is more controllable, useless for hifi but c .......

29: Tube DIY Asylum, Re: how to use a triode or triodes to frequency double in audio range? (0.00)
Posted by radiance on 2006-10-24, 22:12:50 (68.3.102.14)
Tom, thanks very much. One question I do have about the full wave rectification idea: if the complex musical waveform is full wave rectified, and then fed to the primary of an interstage transformer, .......

30: Tube DIY Asylum, Re: Three ways I know of ... (0.00)
Posted by radiance on 2006-10-24, 17:56:37 (68.3.102.14)
Thanks TK, very much, a nice overview and very good advice. I like the digital idea very much; obviously, this has nothing to do with hifi! the nice thing about the digital method is how clean it is; .......

31: Tube DIY Asylum, how to use a triode or triodes to frequency double in audio range? (0.00)
Posted by radiance on 2006-10-23, 22:43:55 (68.3.102.14)
before I spend what little money I have purchasing one of the online articles I found, I wondered if anyone on the forum might already have the info and be willing to share. I have found papers going .......

32: Tubes Asylum, Re: How does rectifier make a difference in sound? (0.00)
Posted by radiance on 2006-10-22, 23:24:09 (68.3.102.14)
thank you very much. i will look into these pronto. best, charles "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the for .......

33: Tubes Asylum, Re: How does rectifier make a difference in sound? (0.00)
Posted by radiance on 2006-10-22, 17:33:42 (68.3.102.14)
pardon my ignorance, but what would be examples of TV damper diodes? I am currently breadboarding various designs, but using the 5U4's in all my supplies - I am hoping that 5U4's are TV damper diodes .......

34: Tubes Asylum, Re: Youv'e already done the test! case closed!! Next!! (NT) (0.00)
Posted by radiance on 2006-10-22, 17:29:53 (68.3.102.14)
Hi Eli, Interesting you should bring up the question of guitar. As a matter of fact, the musicians I was personally referring to are indeed guitarists, but NOT ones who want sag - rather the opposite, .......

35: Tubes Asylum, Re: Youv'e already done the test! case closed!! Next!! (NT) (0.00)
Posted by radiance on 2006-10-22, 16:09:36 (68.3.102.14)
let me clarify. in attempting to avoid writing an essay, i was not as precise as i should have been. once you understand that the part of the brain that is used - whether you wish it or not - in a bli .......

36: Tubes Asylum, Re: I think it is safe to say.... (0.00)
Posted by radiance on 2006-10-21, 01:40:02 (68.3.102.14)
I agree with Russ. John Broskie and others have written on this subject with a great depth of perception, I believe - the problem is that blinded testing in audio is just about worthless. The part of .......

37: Tube DIY Asylum, Re: What kind of diode(?) is symbol of a circle next to cathode bar? (0.00)
Posted by radiance on 2006-10-19, 23:31:48 (68.3.102.14)
pray, why does the cathode need the protection of the diode? or is it acting as a constant current source, for auto-bias? best, charles "It ain't a comeback until it's left the shop" Jimmy Dunne, the .......

38: Tubes Asylum, Re: stereo tube amp for watching movies (0.00)
Posted by radiance on 2006-10-19, 23:06:10 (68.3.102.14)
just wanna tellya I'm blown away by what you've done. wow. best, charles "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has .......

39: Tubes Asylum, Re: Never mind. Did a search on the subject... (nt) (0.00)
Posted by radiance on 2006-10-17, 00:28:31 (68.3.102.14)
I am still trying to sort this one out. The problem that I run into, when I simulate a true choke input filter with a full-wave bridge using tube rectifiers, for B+ of 550+ the peak voltage from induc .......

40: Tubes Asylum, Re: repairing heath ps-3; cannot find rare tube 67-15 (0.00)
Posted by radiance on 2006-10-16, 13:31:19 (68.3.102.14)
Ah, Jim and Tom, thank you so much!! Yes, of course, these are the OA2's. The schematic is a god-send, I have a couple of fried resistors. Hoping the transformer is still good. The mods sound great, w .......

41: Tubes Asylum, repairing heath ps-3; cannot find rare tube 67-15 (0.00)
Posted by radiance on 2006-10-16, 10:56:56 (68.3.102.14)
Hi, waiting for manual for a fried Heathkit PS-3 I won (?!) on ebay, which may clear up this mystery, but I have two tubes, eight pins glass base, they look like thin diodes - or maybe they're gas vol .......

42: Tube DIY Asylum, What you just discovered is something I've been thinking.... (0.00)
Posted by radiance on 2006-08-04, 15:06:30 (72.201.10.143)
...for a while now, and that is that I don't think there are black and white advantages in terms of sonic qualities in different tubes so much as it's a matter of matching the circuit (the whole kielb .......

43: Tubes Asylum, Where can I buy GM-70? (nt) (0.00)
Posted by radiance on 2006-07-29, 13:57:00 (72.201.10.143)
tried all the web tube stores I know of; no find. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to pr .......

44: Tube DIY Asylum, Dude!!!!!!! You're the man!!!! All shall be revealed in about.... (0.00)
Posted by radiance on 2006-07-28, 11:32:17 (72.201.10.143)
...three or four days, when I've had time to put together the page; don't dare post it here, but I will repay your kindness; you got me to just the right place, and you're gonna like the little idea I .......

45: Tube DIY Asylum, yeah, I've got hard data. In a few days..explain later. (nt) (0.00)
Posted by radiance on 2006-07-28, 11:27:30 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

46: SET Asylum, please what does 5K4 mean? 5.4 kilohm? (nt) (0.00)
Posted by radiance on 2006-07-28, 11:22:43 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

47: SET Asylum, Thomas if I use LED's to bias the cathode instead of a resistor,.... (0.00)
Posted by radiance on 2006-07-28, 01:22:57 (72.201.10.143)
...do I still need the cathode bypass capacitor? I think I saw somewhere that using diodes or led's to replace the cathode resistor eliminates the need for the bypass cap. I don't know why. ???? "It a .......

48: Tubes Asylum, oops sorry didn't realize it was rare n.o.s. I use the EH's in the guitar.... (0.00)
Posted by radiance on 2006-07-28, 01:19:15 (72.201.10.143)
...amp for the 12ax7's and the 12at7's and they appear to work fabulously, and the prices are very right! thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a V .......

49: Tubes Asylum, second question - answe it and I'll tell you what sex is like.... (0.00)
Posted by radiance on 2006-07-28, 01:16:29 (72.201.10.143)
....is there an advantage to using a pentode as the upper tube, with the screen regulated? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 20 .......

50: Tubes Asylum, Poindexter, if I have separate power supplies, and give the SRPP.... (0.00)
Posted by radiance on 2006-07-28, 01:14:43 (72.201.10.143)
a negative rail appropriately below the ground of the output stage, then I cna direct couple the SRPP to the output stage tube grid? another alternative to the cap or direct coupling would be an inter .......

51: K&K Audio / Lundahl Transformers, oops, just realized LL1660SAM on the price sheet is for the amorphous.... (0.00)
Posted by radiance on 2006-07-28, 00:24:20 (72.201.10.143)
...iron. I will order it after I doublecheck the data sheets and reassure myself I understand this completely. The part I'm still unclear about is the matter of voltage multiplication depending upon h .......

52: K&K Audio / Lundahl Transformers, Re: question for KandK re app Lundahl tx's I plan to buy from KandK. (0.00)
Posted by radiance on 2006-07-28, 00:21:46 (72.201.10.143)
thanks very much, this is a big help. How much would the LL1660S be with the amorphous iron, and is it in stock right now? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to .......

53: Tube DIY Asylum, what's really funny about this is that this is one of the few times I could do that. (nt) (0.00)
Posted by radiance on 2006-07-27, 16:52:36 (72.201.10.143)
onward "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

54: Tube DIY Asylum, actually, I think AC is probably sonically better than DC UNLESS.... (0.00)
Posted by radiance on 2006-07-27, 16:36:04 (72.201.10.143)
...a particular modification is employed, which I don't want to share until I have the answer to whether switching to current regulation of the DC sounds as good as AC; for what it's worth, I suspect .......

55: Tube DIY Asylum, Re: So...what if you DO have a 12AU7?? (0.00)
Posted by radiance on 2006-07-27, 16:31:37 (72.201.10.143)
so, really stupid question: when using led's for the cathode biasing, do they light up? If so, wouldn't this look awfully coool? Does anyone have a photo of an amp with led biasing where the led's are .......

56: Tube DIY Asylum, I suggest you try current regulated supplies rather than... (0.00)
Posted by radiance on 2006-07-27, 16:07:28 (72.201.10.143)
....voltage regulated supplies, as fatbottle suggests; search for his posts on using the lm317; I THINK you might find, oddly enough, that current regulated heaters with DC sounds as good as AC. IF IT .......

57: Tube DIY Asylum, oh great! anneal?????????? where's a cliff...... (nt) (0.00)
Posted by radiance on 2006-07-26, 19:32:27 (72.201.10.143)
now i gotta read about annealing, as if i didn't have enough to do. criminey. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he .......

58: K&K Audio / Lundahl Transformers, Re: question for KandK re app Lundahl tx's I plan to buy from KandK. (0.00)
Posted by radiance on 2006-07-26, 17:44:14 (72.201.10.143)
sorry, tried to stuff too much into one post. I'm still behind the eight-ball after my accident and don't have the scanner hooked up yet, so please forgive me for trying to do this without a drawing. .......

59: Tube DIY Asylum, Re: Bear in mind LM317 is safe for load less than 1.5A. (0.00)
Posted by radiance on 2006-07-26, 17:31:21 (72.201.10.143)
fatbottle, just wanted to tell you I think you're right on the money here, just beautiful clarity. I've been reading and reading on the matter of filament supply, old books, new articles, really been .......

60: Tube DIY Asylum, Wow, you're a serious glutton for punishment. I respect that. (nt) (0.00)
Posted by radiance on 2006-07-26, 10:38:00 (72.201.10.143)
and I still don't have an explanation from anyone why such harsh language in the copywrite warning. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faste .......

61: Tube DIY Asylum, You're right, I don't. :) (nt) (0.00)
Posted by radiance on 2006-07-26, 10:35:25 (72.201.10.143)
except no one has yet explained the purpose of the copywrite warning "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the .......

62: Tube DIY Asylum, actually i have invented a new tube technology, but none of.... (0.00)
Posted by radiance on 2006-07-26, 01:23:39 (72.201.10.143)
....the information came from this forum, and when I get the patent-pending approval (soon) I will gladly share it for diy'ers only (all commercial interests may negotiate; I'm cheap); since then I've .......

63: Tube DIY Asylum, unfortunately, no go. they don't sell it. bummer. thanks. (nt) (0.00)
Posted by radiance on 2006-07-26, 01:12:23 (72.201.10.143)
thanks, nice try. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him .......

64: SET Asylum, T.M. thank you very very much, I have much better clarity on this now. (nt) (0.00)
Posted by radiance on 2006-07-26, 01:06:13 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

65: Tubes Asylum, have some info for you on the IT tx's (0.00)
Posted by radiance on 2006-07-26, 01:01:41 (72.201.10.143)
The Lundahl LL1677, which is for SE to SE and for driving the 300B, has a 1:2 stepup ratio, will run 80 ma quiescent through primary, at 80 ma it's at 1.2 Tesla's leaving 0.4 T for swing (I'm assuming .......

66: Tubes Asylum, very cool. and since i like to use a separate filament tx than the plate voltage.... (0.00)
Posted by radiance on 2006-07-26, 00:51:53 (72.201.10.143)
....tx, (long story I will post in a few days after i get my patent application in on simple idea but i think a good one, will happily share idea with all diy'ers, just want to protect idea), i like p .......

67: K&K Audio / Lundahl Transformers, question for KandK re app Lundahl tx's I plan to buy from KandK. (0.00)
Posted by radiance on 2006-07-26, 00:46:14 (72.201.10.143)
Hi, I wish to drive a 300B using the Lundahl LL1677; I have two questions on this: 1st, is it possible to drive two 300B's in parralel (still single ended) with one LL1677? And, whether or no, what tu .......

68: Tube DIY Asylum, Re: Sad Songs (Say So Much) (0.00)
Posted by radiance on 2006-07-25, 15:03:13 (72.201.10.143)
Is there a diy audio forum completely and specifically in the public interest, without draconian language regarding copywrite? Is the purpose of the draconian language to allow the owners of the forum .......

69: Tube DIY Asylum, OK, I give up. What does NVH stand for? (nt) (0.00)
Posted by radiance on 2006-07-25, 14:12:17 (72.201.10.143)
I have no problem with NVH, if it helps us understand a better PS design, and I don't even know what NVH stands for! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive .......

70: Tube DIY Asylum, Thank you very much! I'll let you know what I find out. (nt) (0.00)
Posted by radiance on 2006-07-25, 14:08:50 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

71: Tube DIY Asylum, Now that's interesting. However, the Kite only has evil intent.... (0.00)
Posted by radiance on 2006-07-25, 14:07:30 (72.201.10.143)
...from a human perspective; it is only acting true to its own nature; there is no more evil intent or maliciousness in a Kite than when you or I eat a hamburger, no? On the other hand, the word "fell .......

72: Tubes Asylum, cool, will do in an hour or so, after immediate dragon slain. (nt) (0.00)
Posted by radiance on 2006-07-25, 12:23:24 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

73: Tubes Asylum, The 6L6 is such a great tube!!! I probably SHOULD just.... (0.00)
Posted by radiance on 2006-07-25, 12:20:18 (72.201.10.143)
...design this guitar amp around parralelling as many 6L6's as needed for as much power as I want - have given that serious consideration - but I have to confess that one of the reasons I want to buil .......

74: Tubes Asylum, Aha! Great info!! I will get the primary L at lowest Hz from.... (0.00)
Posted by radiance on 2006-07-25, 11:56:39 (72.201.10.143)
....Lundahl along with current specs (I do remember they list the current max's, will check for the rest of the specs). I really like the idea of using 6L6GC triode strapped as the driver; already lik .......

75: SET Asylum, Thank you very much for the explanation; great help. I'll bite:..... (0.00)
Posted by radiance on 2006-07-25, 11:48:30 (72.201.10.143)
......if I were to design the power supply properly, which I have the capability to do from hand-winding the power supply toroid tx secondary all the way through to even a negative rail in addition to .......

76: SET Asylum, Janos, my son's guitar amp uses the Hammond 125E (not ESE, as far.... (0.00)
Posted by radiance on 2006-07-25, 01:53:15 (72.201.10.143)
...as I can tell) but we get fantastic guitar sound out of a 6L6 single ended cathode biased to precisely 40 ma!!! So, it must not be saturating, but this brings up a question: if the quiescent curren .......

77: SET Asylum, I totally agree with you that most of break in is brain accomodation, but.... (0.00)
Posted by radiance on 2006-07-25, 01:48:07 (72.201.10.143)
....I'm not putting down people who talk about the sound changing! I do NOT think caps or tubes "break in" - I think what happens is that with a new sonic signature, the brain listens at first with a .......

78: SET Asylum, Thorsten, doesn't this argue that the very best approach might... (0.00)
Posted by radiance on 2006-07-25, 01:39:42 (72.201.10.143)
...be to build mono-amplified-speakers, so the amp can be tuned to the speaker(s)? The mono-block approach solves the IMD problem; tuning the amp to the speakers helps solve that problem; perhaps we s .......

79: SET Asylum, re LF running amok and causing IMD, wouldn't the best.... (0.00)
Posted by radiance on 2006-07-25, 01:17:45 (72.201.10.143)
....fix simply be separate power supplies? Also, kind of random, but I've been wondering why so many amps use a capacitor to interstage couple rather than direct coupling - is it mostly because to dir .......

80: Tube DIY Asylum, Ah, thank you, I just realized from your post that I've been.... (0.00)
Posted by radiance on 2006-07-25, 00:48:27 (72.201.10.143)
...focusing on the wrong problem; with subcrit L ripple is a problem, but with critical L the more important issue is slew rate vs. ringing and weird waveforms. It is very good to hear from yet anothe .......

81: Tube DIY Asylum, where to find nickel-iron alloy sheet metal (tape roll) for very cool.... (0.00)
Posted by radiance on 2006-07-25, 00:29:59 (72.201.10.143)
...idea I've had for wind-your-own interstage and output tx's, better than van der veen's or whatever his name is; having a hard time locating source on web. If someone can give me an idea of how to f .......

82: Tube DIY Asylum, well, like I said, there's no way to ever know, is there? (0.00)
Posted by radiance on 2006-07-24, 21:50:39 (72.201.10.143)
On the other hand, I do now feel silly, because even if there is a Dr. Evil behind this forum, the fact is I've made some wonderful friends with truly helpful people, unlike morons who like to play mi .......

83: Tubes Asylum, Ahah!! Now I get it!! It's the current peak of a low DCR secondary.... (0.00)
Posted by radiance on 2006-07-24, 21:27:03 (72.201.10.143)
...that kills the tube diodes!!! I didn't understand that. I also now see why it's probably better in the overall picture to go with a center-tapped secondary and two diodes for full wave instead of a .......

84: Tubes Asylum, Thanks, Russ, I appreciate the good advice. I have decided (ridiculously long).... (0.00)
Posted by radiance on 2006-07-24, 21:17:08 (72.201.10.143)
....to go ahead with winding my own lower DCR chokes, but I'm just going to use the regular choke input critical inductance formulas; I have all the glassware tubecad software, hopefully in there some .......

85: Tubes Asylum, best driver tube(s) for 300B's PP using interstage tx? (0.00)
Posted by radiance on 2006-07-24, 18:49:51 (72.201.10.143)
I am going to use a Lundahl interstage double secondary transformer (the transformer splits the phase of the signal so a single tube can drive both tubes of the PP pair) to drive a pair of 300B's in P .......

86: Tube DIY Asylum, nobody's going to at least tell me I'm nuts? (nt) (0.00)
Posted by radiance on 2006-07-24, 18:42:01 (72.201.10.143)
Yeah, I know, I said (nt) but I have to put something in here anyway for it to post, so I'll just talk to myself for a while. I think I'll just go back to critical inductance choke input but wind the .......

87: Tube DIY Asylum, besides, I believe a patent can be applied for within one year of disclosure (nt) (0.00)
Posted by radiance on 2006-07-24, 18:31:24 (72.201.10.143)
it's so odd to me that no one appears to be interested in this. must be an old topic. so, is the forum owned by Dr. Evil, or are there nutcases posting groundless accusations from time to time? How od .......

88: Tube DIY Asylum, IMPORTANT POST PLEASE READ (0.00)
Posted by radiance on 2006-07-24, 11:05:40 (72.201.10.143)
Why did the following post not make it onto the forum? It was in my email, because I have all replies to my posts forwarded to my email, but unless I'm missing something, this post was NOT put on the .......

89: Tubes Asylum, now that I found out that MV tube diodes are no longer in production... (0.00)
Posted by radiance on 2006-07-24, 09:27:08 (72.201.10.143)
...please correct me if my informaton is incorrect, which tube diode (used as a rectifier in a full-wave supply) would not be damaged by use with a large power supply transformer with a secondary havi .......

90: Tube DIY Asylum, you're probly right, but why such harsh language in the fine print? (nt) (0.00)
Posted by radiance on 2006-07-24, 09:20:36 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

91: Tube DIY Asylum, yet John S did hear a significant diff, and he appears a trustworthy source. (0.00)
Posted by radiance on 2006-07-24, 01:47:54 (72.201.10.143)
otherwise, i agree! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor hi .......

92: Tube DIY Asylum, which brings up a potentially very serious problem. (0.00)
Posted by radiance on 2006-07-24, 00:03:18 (72.201.10.143)
After re-reading the copywrite warning, I am hesitant to post any more ideas. Now, mind you, I doubt I'm smart enough to ever come up with a patentable idea in electronics, certainly not one that coul .......

93: Tube DIY Asylum, suggestion for proceeding with new paradigm for power supplies. (0.00)
Posted by radiance on 2006-07-23, 22:55:23 (72.201.10.143)
OK, this one isn't as crazy as the tube regulator one. Here is the idea: perhaps there is a way to keep R, L and C's low so that slew rate is kept really fast but ripple is eliminated, by playing with .......

94: Tube DIY Asylum, Yeah, what the heck was that about? (0.00)
Posted by radiance on 2006-07-23, 21:58:05 (72.201.10.143)
hmmmmmmmmmmmmmmmmmmmm. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor .......

95: Tube DIY Asylum, the problem is that the paradigm has changed, so it's far more.... (0.00)
Posted by radiance on 2006-07-23, 12:26:05 (72.201.10.143)
....complicated now. Jeff's original paradigm was low DCR. In this paradigm, one can simply upgrade the power tx and chokes, and get immediate improvement. I really wish that was the whole shootin' ma .......

96: Tubes Asylum, thanks ffrr, actually, i have a harder time with input stages than outputs, this is simpler; will explore more (NT) (0.00)
Posted by radiance on 2006-07-23, 01:30:25 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

97: Tube DIY Asylum, Yes I used a thermistor for the B+ supply tx and NO thermistor.... (0.00)
Posted by radiance on 2006-07-23, 01:17:47 (72.201.10.143)
...for the filament supply tx; that way the filaments get a head start on the B+; one of these days when I get a break from slaying dragons I'll actually measure onset of B+ vs heatup of the filaments .......

98: Tube DIY Asylum, John, thank you so much, this is a huge help. Clarity is precious. (NT) (0.00)
Posted by radiance on 2006-07-23, 00:58:40 (72.201.10.143)
got it. thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him fo .......

99: Tube DIY Asylum, Fast Recovery Epitaxial Diode - google is a wonderful thing.... (0.00)
Posted by radiance on 2006-07-22, 19:52:23 (72.201.10.143)
....thanks for the tip, will check out 1200 v FRED's. Do you know, or can you advise me who might know, whether I can use a power tx with a secondary less than 100 ohms for a full-wave bridge using tw .......

100: Tube DIY Asylum, Thanks for answering! That's a great question.....somewhere from... (0.00)
Posted by radiance on 2006-07-22, 18:56:44 (72.201.10.143)
350 volts to 435 volts; my new guitar amp project is a 300B single ended. I was originally going to go with something like the JB Labs (Angela) circuit, which has B+ 435 volts to the primary of a 3K o .......

101: Tube DIY Asylum, yer right. i hate the delay; the ONE thing I like about digital is the immediacy (nt) (0.00)
Posted by radiance on 2006-07-22, 13:53:01 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

102: Tube DIY Asylum, I really like the CCS with shunt reg idea for a driver stage OR... (0.00)
Posted by radiance on 2006-07-22, 13:48:46 (72.201.10.143)
(and) a PP output stage, but I cannot imagine that a CCS would help a Single Ended output stage. So, I am coming to the idea of two very different PS's; highly regulated CCS shunt for driver, low DCR .......

103: Tube DIY Asylum, really useful historical information; thanks! (NT) (0.00)
Posted by radiance on 2006-07-22, 13:29:34 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

104: Tube DIY Asylum, interesting! why do tube diodes need to see more resistance in 2ndy? (NT) (0.00)
Posted by radiance on 2006-07-22, 13:27:24 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

105: Tube DIY Asylum, Question: would like to try FWB with 2 tube diodes and 2 SS diodes.... (0.00)
Posted by radiance on 2006-07-22, 13:24:01 (72.201.10.143)
....is there any advantage to making the 2 SS diodes Schottsky's, or should i just stay with plain old silicon? Thanks very much. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first .......

106: Tube DIY Asylum, great point, thanks, but everything before the PP boost is SE; the semi- (0.00)
Posted by radiance on 2006-07-22, 12:54:03 (72.201.10.143)
stack has a triode or triode-strapped tube in single ended mode driving the cabinet speakers (for recording, onstage monitor and very small venues); only the additional gig boost stage (with London Po .......

107: Tube DIY Asylum, No, I'm not kidding at all, there are multiple reasons for.... (0.00)
Posted by radiance on 2006-07-21, 22:53:45 (72.201.10.143)
...preferring a well-filtered DC supply for filaments. In my reading of Tomer, Kohl and Rosebury, I found out that filaments last longer with DC - although I admit I do not yet know whether the filame .......

108: Tube DIY Asylum, pardon my ignorance (most of you thus far have very graciously done so), but.... (0.00)
Posted by radiance on 2006-07-21, 22:39:59 (72.201.10.143)
....as a part of this new paradigm, wouldn't it make sense to also all agree on the rectifier circuit itself? I personally would vote for the full wave bridge that combines two tubes and two SS, from .......

109: Tube DIY Asylum, Re: The Jeff Dilemma, explained by Jeff (0.00)
Posted by radiance on 2006-07-21, 22:34:04 (72.201.10.143)
I would like to propose that for the sake of discovering something fabulous that we assume for the time being that low DCR low H low C has the possibility of being optimum, and discuss how we might fi .......

110: Tube DIY Asylum, pinging drlowmu and all others interested re dc filament supply..... (0.00)
Posted by radiance on 2006-07-21, 22:18:34 (72.201.10.143)
....I'm now working on the second prototype guitar amp, and this one will use DHT's and have a low H low DCR PS for the driver stage and the single ended output, BUT I would really like to use off-the .......

111: Tube DIY Asylum, oh, so I have it backward? when I switched to the 16 ohm... (0.00)
Posted by radiance on 2006-07-21, 22:07:06 (72.201.10.143)
...taps, even though the primary went up, the overall ratio went down....ah. thank you. criminey. I'll get this figured out someday. It so happens I have another output tx, an oldie I picked up on eba .......

112: Tubes Asylum, also, gotta say got really burned the last time i went on a.... (0.00)
Posted by radiance on 2006-07-21, 01:25:00 (72.201.10.143)
...sponsor's forum. I prefer to stay here where its diy. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead sca .......

113: Tube DIY Asylum, Russ are you talking about 3-phase supply from the power.... (0.00)
Posted by radiance on 2006-07-21, 01:08:28 (72.201.10.143)
....company as is wired into industrial buildings, or are you talking about converting single phase to three phase before rectifying it? If the latter, this is a very cool idea indeed. "It ain't a com .......

114: Tube DIY Asylum, sorry for the delay in answering, tough two days. the two.... (0.00)
Posted by radiance on 2006-07-20, 20:42:22 (72.201.10.143)
....we hooked up in series were: a Celestion G12K-100 (big magnet, English co but made in China, I'm afraid, great sound, brighter than the Jensen) and a Jensen Alnico 5 PM series Model P12 N (not ver .......

115: Tubes Asylum, thanks for the tips. was planning on driving 300B's PP; 211s or 845s interesting (NT) (0.00)
Posted by radiance on 2006-07-20, 20:36:30 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

116: Tube DIY Asylum, experiential lesson damping factor for 6L6 tube tone amp. (0.00)
Posted by radiance on 2006-07-20, 01:10:11 (72.201.10.143)
As Max and I continue to develop his 6L6 single ended guitar tone amp, we learned something today that was previously theory. We auditioned three 12" speakers; the Celestion, the Jensen and Tone Tubby .......

117: Tube DIY Asylum, thanks for the tip. i need the dig cam for closeups of tube autopsies to post. (NT) (0.00)
Posted by radiance on 2006-07-20, 00:46:46 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

118: Tube DIY Asylum, Naz, as usual, great thoughtful insight; thanks very much. (NT) (0.00)
Posted by radiance on 2006-07-20, 00:42:08 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

119: Tubes Asylum, No. I mean the Sophia Electric 300B/n; this is a cost-is-no... (0.00)
Posted by radiance on 2006-07-20, 00:34:30 (72.201.10.143)
...object guitar amp; in my first version I singled ended a 6L6GC triode-strapped with choice of clean or overdriven 12ax7's feeding a 12at7 driver (internally parraleled); the tone is just jaw droppi .......

120: Tubes Asylum, Russ, what tube house would you recommend for buying the Tele 12ax7's? (NT) (0.00)
Posted by radiance on 2006-07-19, 08:52:42 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

121: Tubes Asylum, Michael, thanks, your advice is always great. I'll check them out. (NT) (0.00)
Posted by radiance on 2006-07-19, 08:43:32 (72.201.10.143)
cool "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a .......

122: Tube DIY Asylum, WOW! $40! OK, forget my post about wind-your-own toroids. sheez. (NT) (0.00)
Posted by radiance on 2006-07-18, 22:55:20 (72.201.10.143)
sheez "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a .......

123: Tube DIY Asylum, for what it's worth I remember GlassWare journal article.... (0.00)
Posted by radiance on 2006-07-18, 22:53:08 (72.201.10.143)
...that chokes COULD be put in the return rather than the high voltage side, relieving the chokes of having to handle high voltage, leading to much lower cost. Possibility? By the way, re low DCR tran .......

124: Tube DIY Asylum, jeff, love and marriage are two, not three, unless....just kidding. (NT) (0.00)
Posted by radiance on 2006-07-18, 22:46:08 (72.201.10.143)
kidding! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for takin .......

125: Tube DIY Asylum, John, did you try LC as the first stage of the filter, as drlowmu.... (0.00)
Posted by radiance on 2006-07-18, 22:40:38 (72.201.10.143)
....says is mandatory? I see that your first cap in the CLCLCLC network was 50 uf, which is way way higher than even the little fast .1 or under first cap Eli I think - may be misremembering - was sug .......

126: Tube DIY Asylum, by the way, the final conclusion I've come to is..... (0.00)
Posted by radiance on 2006-07-18, 22:31:47 (72.201.10.143)
....that the tube regulator part is too problematic and certainly too expensive, although shunt regulation would probably work pretty well. What I want to try INSTEAD is this: Big TX going to a CLC wi .......

127: Tube DIY Asylum, the problem is that if you are parralelling (sp?) secondaries... (0.00)
Posted by radiance on 2006-07-18, 22:27:17 (72.201.10.143)
...with different numbers of turns you will have voltage differences which means you will have reverse currents which may do strange things to the flux AND current overload one or more windings. You c .......

128: Tube DIY Asylum, actually, now that I think about it, forget it. as you pointed out, (0.00)
Posted by radiance on 2006-07-18, 22:22:16 (72.201.10.143)
the power supply is rapidly becoming more expensive than the rest of the amp!! Hell, if I can't afford to build a second 300B monoblock, I certainly can't build a fancy regulated PS just to try and se .......

129: Tube DIY Asylum, Ray, thanks. Very good info re pentode; didn't know that. (NT) (0.00)
Posted by radiance on 2006-07-18, 22:09:55 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

130: Tube DIY Asylum, OK, I give up. You're right. One can always hope, but this ain't... (0.00)
Posted by radiance on 2006-07-18, 22:07:11 (72.201.10.143)
gonna happen, I see that. thanks. off to ebay for a cheapo digital, I know when I'm beat. my daughter got a perfectly fine digital camera for just over a hundred bucks on ebay, and when it came it was .......

131: Tubes Asylum, Ray, if I'm using an output tx with an 8 ohm tap and a 16... (0.00)
Posted by radiance on 2006-07-18, 21:46:46 (72.201.10.143)
...ohm tap - DIY GUITAR AMP OWN DESIGN NOT HIFI - am I better off putting the two identical 12" speakers in series and driving them from the 16 ohm tap, rather than putting them in parralel and drivin .......

132: Tubes Asylum, THANKS FOR HELP! New question: 300B vs KT90 for GIG stage.... (0.00)
Posted by radiance on 2006-07-18, 21:37:28 (72.201.10.143)
....I am very appreciative for the help on the mic preamp; I'm just going to go with the 12AX7's and 12AU7's with the Jensen transformer - YES!! NOW, I have to make a decision about the GIG BOOST stag .......

133: Tubes Asylum, Thank you very much; this is a great help, will do. (NT) (0.00)
Posted by radiance on 2006-07-18, 10:45:36 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

134: Tubes Asylum, thanks, great advice; yes, plan to isolate tubes from vibes. (NT) (0.00)
Posted by radiance on 2006-07-18, 10:44:04 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

135: Tube DIY Asylum, yeah, i admit the tube voltage regulator IS the weak point.... (0.00)
Posted by radiance on 2006-07-18, 10:24:11 (72.201.10.143)
...of this idea, and you could be absolutely right. Here's an idea I would be willing to do: I have the parts to make ONE 300B SET. (It's a long story why I'm a poor physician, but I didn't get into m .......

136: Tube DIY Asylum, Re: I like it - it makes SENSE! (0.00)
Posted by radiance on 2006-07-18, 10:04:28 (72.201.10.143)
Great great questions. 1. Please to forgive, I don't have the time to dig up the equations right now and figure it out (and there's always the possibility an EE will jump in and just tell us.......ple .......

137: Tube DIY Asylum, CCD!!!!! Aha!!!!!! Great idea!!!!!!! I'll check ebay heh heh (NT) (0.00)
Posted by radiance on 2006-07-18, 09:52:02 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

138: Tube DIY Asylum, Thanks for the tip; I'll check it out, sounds great. (NT) (0.00)
Posted by radiance on 2006-07-18, 09:43:47 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

139: Tube DIY Asylum, Great great advice; it's the wait that drives me nuts, but you're RIGHT! Thanks! (NT) (0.00)
Posted by radiance on 2006-07-18, 09:42:17 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

140: Tubes Asylum, am adding a mic input to my son's guitar amp; ECC88 (6DJ8) or... (0.00)
Posted by radiance on 2006-07-17, 23:52:28 (72.201.10.143)
...12AX7 or 6922EH? Which would have the richer tone? Or is there a third choice I don't know about yet? Would very much appreciate opinions. Thanks. Not concerned with power or noise so much; richnes .......

141: Tube DIY Asylum, Jeff, I KNEW you were gonna say that. I ain't got a grand! (NT) (0.00)
Posted by radiance on 2006-07-17, 23:35:49 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

142: Tube DIY Asylum, ONE MODIFICATION TO PROPOSAL (0.00)
Posted by radiance on 2006-07-17, 22:19:51 (72.201.10.143)
I realized an RF choke on the output of the voltage regulator would slow slew rate, so all that needs to be done to correct the design is use a small cap, under .1 uf as I think it was Eli pointed out .......

143: Tube DIY Asylum, thanks, interesting!! (NT) (0.00)
Posted by radiance on 2006-07-17, 21:07:14 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

144: Tube DIY Asylum, Thanks, drlowmu, great great info. See my new post. (NT) (0.00)
Posted by radiance on 2006-07-17, 21:04:08 (72.201.10.143)
just to stir things up. :) :) :) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will a .......

145: Tube DIY Asylum, drlowmu, nc, Eli, Naz, Russ, and all: AUDACIOUS PROPOSAL: (0.00)
Posted by radiance on 2006-07-17, 21:00:36 (72.201.10.143)
Ahah!! So, a little bit of ripple is not nearly so important as RF noise from the rectification - which explains why tube rectifiers are better than SS (I guess) - and the ability of PS to respond to .......

146: Tube DIY Asylum, I think the old mil spec silver coated copper stranded... (0.00)
Posted by radiance on 2006-07-17, 20:33:11 (72.201.10.143)
...teflon coated wire on ebay is hard to beat; someone on this forum turned me onto it, and I'll never use anything else. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to d .......

147: Tube DIY Asylum, OFF TOPIC: anyone know how to convert a K1000... (0.00)
Posted by radiance on 2006-07-17, 20:30:17 (72.201.10.143)
...old Pentax SLR (I've had it for over twenty years now) to digital? Surely there must be a way to mount a digital grid sensor (whatever it's called) where the film would be and run it into a compute .......

148: Tube DIY Asylum, super. thanks. (NT) (0.00)
Posted by radiance on 2006-07-17, 20:25:54 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

149: Tube DIY Asylum, John, quick question on your circuit: (0.00)
Posted by radiance on 2006-07-17, 08:26:18 (72.201.10.143)
at which point in the CLCLCLC filter are you taking B+ for the output tube(s)? After the entire CLCLCLC set of filters, or somewhere ealier in the chain? Thanks! Great post, wow!! "It ain't a comeback .......

150: Tube DIY Asylum, THANKS JOHN GREAT POST; drlowmu, why......... (0.00)
Posted by radiance on 2006-07-17, 08:21:20 (72.201.10.143)
.....is a CLC after the rectifier stage "nasty" compared to an LC stage? I have been playing with this quietly for a while now, winding my own low DCR low inductance chokes (5H or less), and I find th .......

151: Tube DIY Asylum, Funny! I got a million more straight lines where that one came from (nt) (0.00)
Posted by radiance on 2006-07-17, 07:41:49 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

152: Tube DIY Asylum, how to tell when choke core saturated? (0.00)
Posted by radiance on 2006-07-17, 00:10:03 (72.201.10.143)
If I hook up a hand wound choke to a full wave recified hihgh voltage, say 350 volts, and then run that to a resistor, bringing the curretn up slowly, a low currents I should see a substantially modif .......

153: Tube DIY Asylum, oops, yeah i get it now from both of you THANKS (nt) (0.00)
Posted by radiance on 2006-07-08, 21:37:36 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

154: Tube DIY Asylum, yeah, out in my shop, all GFI, have not changed it yet. (nt) (0.00)
Posted by radiance on 2006-07-08, 18:19:04 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

155: Tube DIY Asylum, Very clear, thank you very much. Will do. (nt) (0.00)
Posted by radiance on 2006-07-08, 18:17:31 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

156: Tube DIY Asylum, very cool! I'll check Triode Elec's out, build one, thanks! (nt) (0.00)
Posted by radiance on 2006-07-08, 18:16:14 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

157: Tube DIY Asylum, will using the 1 ohm resistor trick the ground fault circuit.... (0.00)
Posted by radiance on 2006-07-08, 11:52:00 (72.201.10.143)
...breaker into not tripping? I tried to tie the ground side of the power cord to earth ground (via the third grounding prong/cable on the power cord) in the power supply of the guitar amp I made but .......

158: Tube DIY Asylum, a thought on speakers; my own limited experience showed..... (0.00)
Posted by radiance on 2006-07-08, 10:49:36 (72.201.10.143)
....that speakers are actually relatively unimportant! Now, before I get a truckload of bricks thrown at me, let me explain: yes, there's a difference in quality between speakers, but my impression is .......

159: Tubes Asylum, Just want to say THANKS to everyone who sent me... (0.00)
Posted by radiance on 2006-07-07, 23:59:30 (72.201.10.143)
,,,busted tubes; I now have a really nice assortment of tubes for dissection. I have the computer card so I can hook up the digital camera, now I just need some alligator-free time - about a month fro .......

160: Tube DIY Asylum, I'm a total convert; a 6L6GC (russian) actually. The gig... (0.00)
Posted by radiance on 2006-07-07, 23:33:48 (72.201.10.143)
...stage I think I'm simply going to parralel 6L6GC's in SET; the 12" guitar speakers are so efficient I think two more with two speakers (one speaker each) will be all the volume Max needs for restau .......

161: Tube DIY Asylum, triode strapping wins - again! this time with guitar.... (0.00)
Posted by radiance on 2006-07-07, 20:33:00 (72.201.10.143)
...amp; I had built my son Max a 6L6 output guitar amp with preamp overdrive, reverb, etc, but had kept the screen at B+2 for volume. Then, today, while Max was playing it after another tweak, it sudd .......

162: Tubes Asylum, please give it to Russ (nt) (0.00)
Posted by radiance on 2006-07-07, 12:59:49 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

163: Tube DIY Asylum, that's just what I was wondering, perhaps choke.... (0.00)
Posted by radiance on 2006-07-07, 11:14:43 (72.201.10.143)
...based filters, LC or CLC, are best reserved for B+1, but then use RC stages for B+2, 3, 4, where the stages are primarily voltage, not current, based. "It ain't a comeback until it's left the shop" .......

164: Tube DIY Asylum, if you were designing the perfect SET tube, would you... (0.00)
Posted by radiance on 2006-07-07, 11:11:26 (72.201.10.143)
...then specify a directly heated thoriated tungsten cathode? (please see my post responding to Ed; I promise to stop saying ignorant things and restrict myself to pertinent questions and quoting reco .......

165: Tube DIY Asylum, Thanks, Ed, you're absolutely right; I recognized I needed.... (0.00)
Posted by radiance on 2006-07-07, 11:06:39 (72.201.10.143)
...to change my evil ways with that ignorant response to Mark. What I did not understand, but do now, is that there are vast differences between materials different manufacturers use for different tub .......

166: Tube DIY Asylum, This is exactly what I observed with the triode mod.... (0.00)
Posted by radiance on 2006-07-07, 10:40:33 (72.201.10.143)
...in the (lowly) heathkit aa-151 (PP, though, NOT SE): when I had it triode strapped, NFB cut, ultralinear disconnected, way high B+, the sound was stunningly gorgeous - just jaw dropping - on instru .......

167: Tube DIY Asylum, Thanks!! (That's all I'M going to say.......:) (nt) (0.00)
Posted by radiance on 2006-07-07, 10:05:33 (72.201.10.143)
wow, now that's what I call a truly helpful post. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to pr .......

168: Tubes Asylum, if the problem is the magnetics, I would like to play with... (0.00)
Posted by radiance on 2006-07-06, 23:17:05 (72.201.10.143)
....since I'd rewind them myself anyway. If it's still for takers. Best. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has .......

169: Tube DIY Asylum, continued apology for my really ignorant post....... (0.00)
Posted by radiance on 2006-07-06, 23:13:46 (72.201.10.143)
.....thanks for politely setting me straight, Mark. Yes, of course, the emission spectra are based on quanta, I knew that thirty years ago when I was a chemistry major at Juniata college - I have deci .......

170: Tube DIY Asylum, thanks for the article, LOVED it. (nt) (0.00)
Posted by radiance on 2006-07-06, 21:23:27 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

171: Tube DIY Asylum, thank you, I have saved the data sheet; I had found... (0.00)
Posted by radiance on 2006-07-06, 21:06:38 (72.201.10.143)
...two other data sheets but neither of them told me what the filament was made of. Question for you Mark, and whoever else might wish to chime in, if you were making a brand new tube from scratch, sp .......

172: Tube DIY Asylum, Now using part of the secondary to provide the anti-saturating.... (0.00)
Posted by radiance on 2006-07-06, 18:38:44 (72.201.10.143)
....current is A VERY COOL IDEA. If I can figure out the gauges of the primary and secondary wire - it would be nice if they're the same - then I can calculate by DC resistance the number of windings .......

173: Tube DIY Asylum, OOOPS! APOLOGIES!! I take it back, you're right. Here's the scoop: (0.00)
Posted by radiance on 2006-07-06, 18:30:13 (72.201.10.143)
of the RF tubes sometimes used in SET's, the 845 and the 813 have thoriated tungsten DH'd filaments. The 2A3, 300B and 45 are DH'd filaments, BUT they are oxide coated tungsten - and, yes, operate at .......

174: Tube DIY Asylum, thanks for the cool spectrum, Mark, but there is a..... (0.00)
Posted by radiance on 2006-07-06, 17:56:30 (72.201.10.143)
....flaw in your reasoning. The color of emission is dependent not only on the filament material but also the temperature to which it has been raised, which in turn is dependent upon the current being .......

175: Tube DIY Asylum, hmmm.....there's a mystery here; when I get the time to dissect.... (0.00)
Posted by radiance on 2006-07-06, 17:35:38 (72.201.10.143)
....the broken tubes I've been sent, I may be able to get this all straightened out. Here's the problem: according to my reading, and the old RCA Receiving Tube Manual, and the text on tube materials .......

176: Tube DIY Asylum, wow, great questions!! don't know, but will find out. will..... (0.00)
Posted by radiance on 2006-07-06, 14:43:55 (72.201.10.143)
....take all my reading - still ongoing, just received several more books from the '30's and the wonderful Tomer - and summarize it all into a monograph on directly and indirectly heated cathodes, whi .......

177: Tube DIY Asylum, thanks, bpur, you just saved my OP tx's!!! yeah, that.... (0.00)
Posted by radiance on 2006-07-05, 22:04:05 (72.201.10.143)
...would have been a bummer. Great ideas; lots of food for thought. Now, if I can just cut the old core out without hurting the windings.......figure out how to get a bulk roll of nickel-iron alloy ch .......

178: Tube DIY Asylum, according to my reading, it all depends upon whether.... (0.00)
Posted by radiance on 2006-07-05, 21:59:22 (72.201.10.143)
...the cathode is a direct emitter (thoriated tungsten) as in the 2A3, 300B, 45, 845, etc (long list)., or an indirectly heated emitter (oxide coated nickel over ceramic insulator with tungsten filame .......

179: Tube DIY Asylum, oops typo, meant primary. sheez, i better adjust my medication....(nt) (0.00)
Posted by radiance on 2006-07-05, 21:41:54 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

180: Tube DIY Asylum, thanks, all your ideas are great; always good to know... (0.00)
Posted by radiance on 2006-07-05, 11:22:25 (72.201.10.143)
....stuff that's been tried and didn't work so hot, like trying to put on a teriary winding - which COULD work with some fiddling, but it would mean getting rid of the coil covers (I don't know what t .......

181: Tube DIY Asylum, got it; you're exactly right; I was just being greedy.... (0.00)
Posted by radiance on 2006-07-05, 11:15:26 (72.201.10.143)
...and wanting to use the whole primary for the output tubes (formerly PP pair) in SET parralel heh heh heh probably one of those just no way to do it cheaply enough to avoid just replacing the OT (wh .......

182: Tube DIY Asylum, Thanks, Ron, great info; have saved! (nt) (0.00)
Posted by radiance on 2006-07-05, 11:11:00 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

183: Tube DIY Asylum, thanks, Ron, good to know; have saved info (nt) (0.00)
Posted by radiance on 2006-07-05, 11:09:49 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

184: Tube DIY Asylum, thanks, got it. I was being greedy and wanting to use... (0.00)
Posted by radiance on 2006-07-05, 11:06:50 (72.201.10.143)
....the whole winding for both tubes in SET, rather than one tube in SET and the other as the opposing CCS. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beet .......

185: Tube DIY Asylum, can't I prevent saturation in a non-air-gapped output... (0.00)
Posted by radiance on 2006-07-05, 00:17:27 (72.201.10.143)
....transformer I want to use as a SET tx by simply adding another power supply to run an opposing current through the primary equal to the quiescent current of the set output tube (pair, actually) - .......

186: Tube DIY Asylum, blub......blub......blub........sure is murky down here!!.(long,murky)........ (0.00)
Posted by radiance on 2006-07-04, 10:33:35 (72.201.10.143)
.....and I'm not kidding! Russ, just so you know, I have made a file right on my desktop where I save posts that give me starting points for understanding this stuff; it's stuffed with your posts, and .......

187: Tube DIY Asylum, Mark, thank you; you and BBECK have me straightened... (0.00)
Posted by radiance on 2006-07-03, 23:46:06 (72.201.10.143)
...out on this; sigh, and it seemed like such a GOOD theory - just completely wrong! It IS good to know that the electrons zip to the plate so friggin' fast that time delays at audio frequencies have .......

188: Tube DIY Asylum, oops thanks Ron for correction, have saved yr post will do (nt) (0.00)
Posted by radiance on 2006-07-03, 23:37:33 (72.201.10.143)
thanks, much appreciated. will give careful thought. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to .......

189: Tube DIY Asylum, ah, this is excellent, will do. thank you!! (nt) (0.00)
Posted by radiance on 2006-07-03, 23:23:26 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

190: Tube DIY Asylum, Ron, thank you very much. (nt) (0.00)
Posted by radiance on 2006-07-03, 23:04:37 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

191: Tube DIY Asylum, perhaps (answering my own question) I leave the resistor... (0.00)
Posted by radiance on 2006-07-03, 22:29:48 (72.201.10.143)
...with parralel cap in place and replace the 1k cathode resistor for the drive tube with a 1k pot, and bring the NFB in on the variable leg; this way the tube stays cathode biased with 1k no matter w .......

192: Tube DIY Asylum, if I want to vary NFB by using a pot instead of the resistor... (0.00)
Posted by radiance on 2006-07-03, 22:25:09 (72.201.10.143)
...in the circuit (heathkit several), what do I do about the bypass capacitor in parralel with the resistor? For example, in the aa-151 (I wish I could give you the values for the aa-32, but I misplac .......

193: Tube DIY Asylum, BTW, does 6K5 mean 6.5K? (nt) (0.00)
Posted by radiance on 2006-07-03, 22:12:15 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

194: Tube DIY Asylum, oh, thanks, Dave, sorry if I over-reacted. :) (nt) (0.00)
Posted by radiance on 2006-07-03, 11:59:51 (72.201.10.143)
a "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a cha .......

195: Tube DIY Asylum, I'm not part of this debate, I was ONLY suggesting.... (0.00)
Posted by radiance on 2006-07-02, 13:24:47 (72.201.10.143)
....that if a poster wants to whack a mole, we'd be a little better off by using a more accurate term such as "technodogma" rather than the word "science". Science to me is a sacred concept and proces .......

196: Tube DIY Asylum, Re: aa-32 mod...(not REAL long!)....2nd harmonic theory.... (0.00)
Posted by radiance on 2006-07-02, 11:42:13 (72.201.10.143)
Dear BBECK, Thank you very much; I sincerely appreciate you taking the time to talk to me about this. I will have to chew on this for awhile. I'll reread your post and think about it carefully, do som .......

197: Tube DIY Asylum, Re: aa-32 mod...(not REAL long!)....2nd harmonic theory.... (0.00)
Posted by radiance on 2006-07-02, 00:54:45 (72.201.10.143)
Thanks, Jeff, very much; very interesting and different take on the screen. Now, when you say separate supply for the screen, do you mean a fixed voltage that does not change in relationship to anythi .......

198: Tube DIY Asylum, Re: aa-32 mod...(not REAL long!)....2nd harmonic theory.... (0.00)
Posted by radiance on 2006-07-02, 00:47:26 (72.201.10.143)
Thank you for your post; I really appreciate it; all information is helpful so I can understand better. I do not think mathematically, and no amount of beating on my brain will work - after 50+ years .......

199: Tube DIY Asylum, Re: One problem with keeping the chassis is... (0.00)
Posted by radiance on 2006-07-01, 14:07:26 (72.201.10.143)
thanks for the info. now I know how I got it on ebay, I just threw in an early bid and forgot about it, I did not expect to get it!!!! Oh well, it will be a great learning experience. I can always put .......

200: Tubes Asylum, THANK YOU ALL!!! Thanks very much...... (0.00)
Posted by radiance on 2006-07-01, 13:21:06 (72.201.10.143)
.....I will put together a non-scientific "take" on the results and post it soon. I wanted opinions from members of this forum, rather than googling, because I thought that here I could probably cut r .......

201: Tube DIY Asylum, I would respectfully suggest that you stop..... (0.00)
Posted by radiance on 2006-07-01, 12:41:08 (72.201.10.143)
....whacking science and use a more accurate term, such as "technodogma". Science is the pursuit of truth via the testing of hypotheses using methods that are extra-philosophical; it may be inductive .......

202: Tube DIY Asylum, aa-32 mod...(not REAL long!)....2nd harmonic theory.... (0.00)
Posted by radiance on 2006-07-01, 12:31:08 (72.201.10.143)
...this amp is a N.O.S. unassembled kit I got from this forum's classifieds, it's for my daughter Hannah.....this is an elegant - or at least simpler - little design from looking at the schematic; vol .......

203: Tube DIY Asylum, Russ, just wanted to say - can't say it too many .... (0.00)
Posted by radiance on 2006-07-01, 11:08:33 (72.201.10.143)
... times how much I appreciate your help. Someday I'll return the favor, although right now it seems hard to imagine how. Until I get the amp and schematic I'm going to put this on hold - it all depe .......

204: Tube DIY Asylum, Re: oh, now i see what you did, missed it the first time..... (0.00)
Posted by radiance on 2006-07-01, 10:54:31 (72.201.10.143)
very cool!!! love your site!!!! I read all the pages except the radio (later) and cruised some of the links (guitar schematic heaven was a trip); nice, nice place, like visiting your best friend in hi .......

205: Tube DIY Asylum, Re: WHAT ?? (0.00)
Posted by radiance on 2006-06-30, 22:59:16 (72.201.10.143)
I gotta tell you, while I have great respect for the obvious and huge technical difficulties to be overcome in designing sound for big movie theatres, I can't say I like movie theatre sound itself; my .......

206: Tube DIY Asylum, please to see previous "oops" posting? (0.00)
Posted by radiance on 2006-06-30, 22:53:39 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

207: Tube DIY Asylum, oops sorry I didn't say what I MEANT which was.... (0.00)
Posted by radiance on 2006-06-30, 22:50:37 (72.201.10.143)
....that when I searched for chassis punches I found lots that were just the main hole, but I couldn't find multi-part punches that would get all the holes in one shot; for example, a potentiometer wi .......

208: Tube DIY Asylum, Re: Sell that one (0.00)
Posted by radiance on 2006-06-30, 22:39:05 (72.201.10.143)
y'know your comment about multiple taps (there's a CT too I'll bet) combined in my memory with the site PeterP recommended to someone else where a pair of triodes or triode-strapped pentodes can drive .......

209: Tube DIY Asylum, Re: Sell that one (0.00)
Posted by radiance on 2006-06-30, 22:26:40 (72.201.10.143)
thanks, much appreciated. you know, it's funny about people, I absolutely adore the look of all the bare tube on platform amps, especially with the wooden bases, just gorgeous, gorgeous, but somehow i .......

210: Tube DIY Asylum, oh, now i see what you did, missed it the first time..... (0.00)
Posted by radiance on 2006-06-30, 22:08:04 (72.201.10.143)
....interesting. very nice. I think I might do the same, thanks for the tip, but i would keep the case actually, just gut the chassis and then reposition everything; I like controls on the front and I .......

211: Tube DIY Asylum, Re: schematic and advice for aa-100?...(!!!)....... (0.00)
Posted by radiance on 2006-06-30, 22:00:28 (72.201.10.143)
interesting. wonderful site, you do fabulous things, wished I was rich...... I notice you left the aa-151 stock (at least according to the schematic); I like it triode modded MUCH better than the orig .......

212: Tube DIY Asylum, got it. sorry, didn't realize you had already been ..... (0.00)
Posted by radiance on 2006-06-30, 16:24:57 (72.201.10.143)
.... there done that. cool. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always .......

213: Tube DIY Asylum, Thanks, Ron, I had no idea!!!!!!...... (0.00)
Posted by radiance on 2006-06-30, 16:17:40 (72.201.10.143)
...amazing. How does one post without text in this box? The forum won't let me post without writing something in here, but all I wanted to say was thanks. thanks. :) "It ain't a comeback until it's le .......

214: Tube DIY Asylum, Re: Sell that one (0.00)
Posted by radiance on 2006-06-30, 16:15:51 (72.201.10.143)
Thanks, Russ, and no, I wouldn't dream of selling the aa-151; it sounds SO good and Andrew is totally totally grooving on it (and so am I; proud dad) and it was (and will be again) my "learner". Hmmmm .......

215: Tube DIY Asylum, schematic and advice for aa-100?...(!!!)....... (0.00)
Posted by radiance on 2006-06-30, 14:39:12 (72.201.10.143)
....well, I'll be - I had completely forgotten I threw in a bid a week ago on an old heathkit aa-100, and I got it! another ultralinear design, except this one is higher power and uses 7591's in PP ul .......

216: Tube DIY Asylum, wow, I just DID this whole mod; I think you are missing... (0.00)
Posted by radiance on 2006-06-30, 14:21:18 (72.201.10.143)
....the essential point. I just finished mod'ing a heathkit aa-151 with el84's in PP ultraliner, with a lot of help from Russ and Tre and a bunch of others, and here's what i ended up doing: 1. triode .......

217: Tubes Asylum, opinions desired: 2A3 vs 45 vs 845 vs 300B.......... (0.00)
Posted by radiance on 2006-06-29, 16:13:41 (72.201.10.143)
.....continuing to work at understanding underlying (relationship structure, materials, parameters) sonic nature of these DHT tubes: which is the VERY BEST SONICALLY, IGNORING VOLUME considerations. J .......

218: Tube DIY Asylum, Happy End (for now) to Heathkit aa-151 saga..... (0.00)
Posted by radiance on 2006-06-29, 15:58:43 (72.201.10.143)
....my son Andrew is now happily listening to the heathkit aa-151 (some punk-funk-rock band old vinyl at the moment); I ended up as follows: about 29 ma each el84 in PP triode mode (grid 2 strapped to .......

219: Tube DIY Asylum, Re: anti-science crowd is usually very poorly informed about "science" (0.00)
Posted by radiance on 2006-06-29, 14:06:25 (72.201.10.143)
yeah, I agree, there's a lot more going on in the nucleus than just the genome; we're just starting to scratch the surface of how genes are actually controlled by extra-DNA structural factors, but the .......

220: Tube DIY Asylum, Ah!! Which brings up the question I've been looking.... (0.00)
Posted by radiance on 2006-06-29, 11:55:04 (72.201.10.143)
...for the answer to: can I use a molded toroid shape ferrite (I assume it's ferrite powder in expoxy or some such) ring to wind up my own power supply chokes? I have been trying to find out if these .......

221: Tube DIY Asylum, which brings up an interesting question (for me) (long)... (0.00)
Posted by radiance on 2006-06-29, 11:15:16 (72.201.10.143)
....yes, Tre, I noticed the same thing. thanks for the link; I had misplaced where I read that, maybe a different place, but I knew that, and it's really been bugging me with my heathkit aa-151 triode .......

222: Tube DIY Asylum, i couldn't make the link work; went back to the.... (0.00)
Posted by radiance on 2006-06-29, 10:52:56 (72.201.10.143)
....url itself, couldn't get that to go too. sounds like they croaked. it is surprising to me how hard chassis punches are to find, I've been searching and searching, including obvious sources, and no .......

223: SET Asylum, I think this trend toward brighter tone may be due to.... (0.00)
Posted by radiance on 2006-06-27, 21:21:50 (72.201.10.143)
....a lot more people going partly deaf at much earlier ages; a lot of rock in small venues are WAY too loud and cause serious hearing damage (sensitivity to high frequencies goes FIRST); ear buds tur .......

224: Tube DIY Asylum, has anyone actually found out whether the blasted... (0.00)
Posted by radiance on 2006-06-27, 20:50:43 (72.201.10.143)
...mercury actually gets out of the tube? I'm not saying it doesn't, I'm just saying it's only one hypothesis (I meant to search this myself in medline but got distracted; I'll try to remember to do i .......

225: Tube DIY Asylum, Re: And here I was thinking you were mad at me:) (0.00)
Posted by radiance on 2006-06-27, 20:40:43 (72.201.10.143)
thanks, Russ, yes, I was just coming to that realization, that the ratios are more important than the absolute voltage; I will redo those resistors. I do think when I get time to adjust the current on .......

226: Tube DIY Asylum, Re: 300b heater 4,4v (0.00)
Posted by radiance on 2006-06-27, 15:59:52 (72.201.10.143)
assuming the tube you are talking about has only four pins, it has a direct heated thoriated tungsten filament, which, according to my reading, does not like to be starved. While indirectly heated oxi .......

227: Tube DIY Asylum, continuing saga heathkit aa-151 conversion (0.00)
Posted by radiance on 2006-06-27, 15:37:37 (72.201.10.143)
I hope it's OK to start a new thread on this; the old one is now so long and so far down the list I'm afraid I'm going to lose it. Someone please tell me if I'm breaking a rule here or if I should hav .......

228: Tube DIY Asylum, yeah, choke input it is; about to start. as for bottlehead (long)... (0.00)
Posted by radiance on 2006-06-26, 09:06:51 (72.201.10.143)
...forum, I seem to have a way of pissing people off via email; it's this medium combined with my autism. In person or by telephone I have no problems; people see me as a little irritable (at least th .......

229: Bottlehead Forum, oh for crissakes put some goddammed signs up... (0.00)
Posted by radiance on 2006-06-26, 06:53:44 (72.201.10.143)
...around this place! No, I don't have the time to read all the fine print, and I was referred over to this forum by someone who thought there were a couple people over here who would be helpful. So, .......

230: Tube DIY Asylum, just a few quick additional thoughts.... (0.00)
Posted by radiance on 2006-06-26, 06:41:47 (72.201.10.143)
....thanks for all the tips and thoughts; I appreciate how you think both globally and specifically. For some odd reason, probably having to do with salvaging the broken scraps of my horrific childhoo .......

231: Tube DIY Asylum, Dale (and all) thank you very much for your kind.... (0.00)
Posted by radiance on 2006-06-26, 06:23:59 (72.201.10.143)
....and detailed suggestions. This is all a lotta food for thought; a lot of digesing to do. I think I will stick with getting the output to work PP in Class A1 the best I can, for the time being, and .......

232: Tube DIY Asylum, yeah, it's a prob. Here are the measurements: (0.00)
Posted by radiance on 2006-06-26, 06:03:12 (72.201.10.143)
B+1 at plate EL84's: 375 volts (385 shown in schematic); common cathode resistor is 100 ohms, it has 156 milliamps running through it (I measured the current directly; it is fascinating to me that thi .......

233: Tube DIY Asylum, more data: 374 plate volts (circuit says 480); current through (0.00)
Posted by radiance on 2006-06-25, 23:31:10 (72.201.10.143)
100 0hm common cathode resistor is 156 ma (about 39 ma each tube, although I think some are drawing more than others judging from the slight variations in color); when I inserted 200 ohms for the fun .......

234: Tube DIY Asylum, thanks for the info; the SA-2 is next, oddly enough! (0.00)
Posted by radiance on 2006-06-25, 23:07:22 (72.201.10.143)
I will probably add on separate ps for the el84 stage, leave the old one for the preceding stages; they'll have more power than they need. I can tweak those voltages down a little if I want to, too. I .......

235: Tube DIY Asylum, I measured the plate voltage. 374 volts. wow. yeah, (0.00)
Posted by radiance on 2006-06-25, 22:55:54 (72.201.10.143)
I see the problem; the output tx is the first thing the B+ sees (B+1), then it steps down, via RC stages, to the preceeding sections. I can't mess up the previous stages, so it seems to me I have two .......

236: Tube DIY Asylum, thanks. yes, I wondered about that 100 ohm..... (0.00)
Posted by radiance on 2006-06-25, 20:41:24 (72.201.10.143)
...cathode resistor; I thought it was too low - my own calc was it should be 125 ohms, but I probably made a mistake somewhere. That would explain it, I see now - the grid is cathode biased closer to .......

237: Tube DIY Asylum, very interesting experiment with heathkit aa-151: results: (0.00)
Posted by radiance on 2006-06-25, 19:39:33 (72.201.10.143)
I had to fix this aa-151 i got on ebay anyway, so, taking Russ's advice, after I replaced all the coupling and power supply caps, I triode strapped the output EL84's (I actually wanted to convert it f .......

238: Tube DIY Asylum, that's a very interesting idea; I've thought about.... (0.00)
Posted by radiance on 2006-06-25, 17:28:07 (72.201.10.143)
....how one could run a single ended tube with the grid just barely at cutoff, and drive it so it goes into conduction to varying degrees for the entire cycle; this is the reverse of that in a way...y .......

239: Bottlehead Forum, thanks, that's what russ said on the other forum.... (0.00)
Posted by radiance on 2006-06-25, 17:17:58 (72.201.10.143)
.....oh, and I see - the tube works against the choke, and the cap only transfers AC to the primary. Huh. Which means the primary of the output tx is in paralel with the choke, but if the choke resist .......

240: Bottlehead Forum, Re: converting heathkit aa-151 to SET (0.00)
Posted by radiance on 2006-06-25, 17:07:23 (72.201.10.143)
hmmm...well, maybe I got directed to the wrong forum; certainly did not mean to tread on a potential competitor's toes. My intent is perfectly innocent; I did heathkits as a kid, and always loved to m .......

241: Tube DIY Asylum, ok, russ, i posted there :) followup idiot questiion..... (0.00)
Posted by radiance on 2006-06-25, 13:55:50 (72.201.10.143)
...when I triode strap grid 2 to the plate (9 yo 7), do I disconnect the ultralinear output tx connection, which is currently pin 9 to the 40% tap on the output primary? I assume I do..... "It ain't a .......

242: Bottlehead Forum, converting heathkit aa-151 to SET (0.00)
Posted by radiance on 2006-06-25, 13:51:47 (72.201.10.143)
Does anyone know how to convert a heathkit aa-151 to SET? I think I can figure it out, but I don't know if the output transformers will allow it? I can strap grid 2 to the plate with a 50 ohm resistor .......

243: Tube DIY Asylum, thanks, will do (nt) (0.00)
Posted by radiance on 2006-06-25, 13:46:29 (72.201.10.143)
nt "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a ch .......

244: Tube DIY Asylum, thanks, will try (nt) (0.00)
Posted by radiance on 2006-06-25, 13:11:40 (72.201.10.143)
thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

245: Tube DIY Asylum, oops I forgot to mention, although I'm sure it was obvious... (0.00)
Posted by radiance on 2006-06-25, 12:04:35 (72.201.10.143)
...that I want to convert the output to SET, with parralel EL84's each channel, hopefully without needing to replace the output transformers. Should I figure out how to post the schematic here? "It ai .......

246: Tube DIY Asylum, not so stupid question; maybe someone already.... (0.00)
Posted by radiance on 2006-06-25, 12:03:01 (72.201.10.143)
.....knows the details: I want to change the output stage of my heathkit aa-151, which is PP ultralinear with el84's. so, I connect grid 2 to the plate via a 50 ohm resistor, connect grid 3 to the cat .......

247: Tube DIY Asylum, quick REALLY stupid question....... (0.00)
Posted by radiance on 2006-06-25, 11:54:19 (72.201.10.143)
.....what happens if one hooks up all three grids together as the control grid in a pentode, and runs the pentode as a single ended triode (into an output transformer)? "It ain't a comeback until it's .......

248: Tube DIY Asylum, yeah, that's exactly what I did. I think you meant squared... (0.00)
Posted by radiance on 2006-06-24, 23:50:27 (72.201.10.143)
....but I got the 4H. thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will alway .......

249: Tube DIY Asylum, please forgive my ignorance, but I would like to suggest.... (0.00)
Posted by radiance on 2006-06-24, 22:47:26 (72.201.10.143)
.....- after having spent quite some time wrestling with what type of power supply I'm going to build for my 813 project - I decided, for better or worse, to simply wind seriously heavy iron in the po .......

250: Tube DIY Asylum, thanks for the fun. explanation please on the 4H? (0.00)
Posted by radiance on 2006-06-24, 09:27:47 (72.201.10.143)
I understand the correct answers - assuming yours are correct - except for the 4H. Would you please explain? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Bee .......

251: Tube DIY Asylum, any theoretical rationale for that assertion? (0.00)
Posted by radiance on 2006-06-24, 09:06:45 (72.201.10.143)
I am willing to bet that assertion is based on an amp where something was not optimized in the circuit that provided DC to the heater; I can't imagine any intrinsic sonic benefit from using AC for the .......

252: Tube DIY Asylum, thanks. also thanks for the tip on the oil filled HV.... (0.00)
Posted by radiance on 2006-06-23, 21:45:33 (72.201.10.143)
...caps, I hadn't thought about that yet. But, if I'm going to go nuts on this, AND if I can afford it (gotta figure that out), it does seem logical to go with caps I don't have to worry about nearly .......

253: Tube DIY Asylum, thanks. yeah, I'd much rather put the effort.... (0.00)
Posted by radiance on 2006-06-23, 21:36:41 (72.201.10.143)
...into the transformer. Do it right, never have to worry about it. If I cover each layer with high voltage dope first, mylar film second, and pay really really good attention to each layer transition .......

254: Tube DIY Asylum, Re: One inductor. Two identical windings. Pop quiz. (0.00)
Posted by radiance on 2006-06-23, 18:28:43 (72.201.10.143)
here are my ignorant guesses: 1st ?: 0.5 H 2nd ?: 1.0 H 3rd ?: 0 H 4th ?: 0.5 H 5th ?: 0 H I am looking forward to the correct answers! "It ain't a comeback until it's left the shop" Jimmy Dunne, .......

255: Tube DIY Asylum, So, Jim, can I ask you for your recommendation... (0.00)
Posted by radiance on 2006-06-23, 17:58:32 (72.201.10.143)
....on the following problem I'm still banging my head against? I am going to make a 1500 volt power supply for the plate of the 813. Now, I know how to wind a secondary to get the 1500 volts without .......

256: Tube DIY Asylum, got it. so stacking secondaries only works with.... (0.00)
Posted by radiance on 2006-06-23, 16:11:41 (72.201.10.143)
...a full wave bridge, so the whole stack can reverse each cycle. cool. thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and .......

257: Tube DIY Asylum, now that's funny (nt) (0.00)
Posted by radiance on 2006-06-23, 16:10:32 (72.201.10.143)
:) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking a ch .......

258: Tube DIY Asylum, huh. thanks. pardon my ignorance, but how does.... (0.00)
Posted by radiance on 2006-06-23, 11:08:58 (72.201.10.143)
....the center tapped design with tube diodes cause dc? or do you mean that because the field doesn't reverse for each half of the CT winding, the core is only seeing lines of force one way, with no r .......

259: Tube DIY Asylum, funny you should mention the voltage problem, I can... (0.00)
Posted by radiance on 2006-06-23, 10:28:41 (72.201.10.143)
...see how with bifilar and not planning really well one could end up two windings a mm apart in distance and 2000 volts apart (or whatever, I just happen to be contemplating that high a voltage secon .......

260: Tube DIY Asylum, oh, right, for low power needs the doubler will work.... (0.00)
Posted by radiance on 2006-06-23, 10:15:53 (72.201.10.143)
...fust fine.....although, if he's got a ton of 'em anyway, it does seem to me quick and easy to just stack a couple of them. :) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first m .......

261: Tube DIY Asylum, wow thanks for the great explanation, now I see why.... (0.00)
Posted by radiance on 2006-06-23, 09:21:01 (72.201.10.143)
....a bifilar winding gives a nice AC balanced secondary winding with a centertap, although the DC balance won't be perfect. Amazing how this forum often answers a question I have within a day of it p .......

262: Tube DIY Asylum, couldn't the transformers be stacked......... (0.00)
Posted by radiance on 2006-06-23, 09:14:08 (72.201.10.143)
.....since he has a ton of em anyway? paralel the primaries and series the secondaries to get what he wants? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Bee .......

263: Tubes Asylum, whether to parralel the....in the Angela 300B.... (0.00)
Posted by radiance on 2006-06-23, 00:18:27 (72.201.10.143)
I just measured the DCR of the secondary windings of the power transformer I bought as part of the first 300B monoblock kit from Angela. Unfortunately, 20 ohms. It is a double winding, so I COULD put .......

264: Tubes Asylum, can the electromagnetic noise from a mercury vapor... (0.00)
Posted by radiance on 2006-06-23, 00:03:46 (72.201.10.143)
...rectifier tube be shielded and drained to ground if there is a mesh grounded can around it? I wouldn't want to put it in a solid can, because of cooling and because I want to SEE it, but maybe a gr .......

265: SET Asylum, Re: 300B SET zero feedback schmetic + part list (0.00)
Posted by radiance on 2006-06-22, 23:41:09 (72.201.10.143)
I'm using the Angela JE Labs 300B SE at Angela.com to build my first SET; the only NFB it has is due to the cathode resistor, which only sorta counts, depending upon who you talk to.....anyway, I'm ho .......

266: SET Asylum, if you have an old 845 that's no longer usable, would... (0.00)
Posted by radiance on 2006-06-22, 23:03:41 (72.201.10.143)
...you mind sending it to me? I'd really like to take it apart. I have ordered books on tube engineering and design to better understand the inner workings, but I would love to dissect an 845. I would .......

267: Tube DIY Asylum, so........is Tre' correct? being at the point of deciding.... (0.00)
Posted by radiance on 2006-06-22, 22:30:21 (72.201.10.143)
....how to design the PS for the 813 SET I'm going to build, I have just this choice: stack secondaries or use doublers? I have monster toroids with the primaries already on; I will wind the secondari .......

268: OTL Asylum, Re: If so,...my understanding is that an array with.... (0.00)
Posted by radiance on 2006-06-22, 20:56:19 (72.201.10.143)
...more than just two or three elements (two fullranges with a tweeter in between or on top, all in a vertical line, is a common proven design)...but an array with a serious number of drivers can be a .......

269: Tubes Asylum, Re: The late 1950s GE/MIT tube study........ (0.00)
Posted by radiance on 2006-06-22, 20:46:24 (72.201.10.143)
....I have ordered books on the engineering of vacuum tubes, but after extensive googling I still have not been able to come up with anything from this late 1950's GE/MIT study, including that one guy .......

270: Tubes Asylum, yes, I really do. I can see I have all sorts of misinformation.... (0.00)
Posted by radiance on 2006-06-22, 20:26:51 (72.201.10.143)
...from bashing around on the web. So, having gotten to the right places with help from all of you, I now have coming to me: Handbook of Electron Tube and Vacuum Techniques Handbook of Materials and T .......

271: Tube DIY Asylum, Re: Tube Overload (0.00)
Posted by radiance on 2006-06-22, 19:49:37 (72.201.10.143)
maybe this is where a larger grid stopper resistor is needed, but it might make it harder to get it into overdrive "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a .......

272: Tubes Asylum, it's a good question; when it comes to plate materials... (0.00)
Posted by radiance on 2006-06-21, 18:30:34 (72.201.10.143)
....the idea is to use a compound that is good at capturing electrons and not allowing them to bounce off. That is the purpose of the suppression grid (grid 3) in a pentode; to push electrons back ont .......

273: Tubes Asylum, thanks! i shall obtain said book as quickly as ..... (0.00)
Posted by radiance on 2006-06-21, 13:22:00 (72.201.10.143)
...possible and greedily devour it, in between dissecting tubes! Today, I am going to start with a used EL84, that being the only used tube I have that is not presently in service; I just can't bring .......

274: Tubes Asylum, you betcha, thanks......... (0.00)
Posted by radiance on 2006-06-21, 13:10:32 (72.201.10.143)
....this is not a trivial undertaking from the standpoint of environmental risk. Which reminds me: I have to find out whether mercury-containing tube diodes actually outgas the mercury over time; if s .......

275: Tubes Asylum, ahhhhhhhhhhhhhhhhhhhhhhhhhhh!!!!!!!!! (the sound..... (0.00)
Posted by radiance on 2006-06-21, 13:07:23 (72.201.10.143)
....of my neurons in synchronous ecstacy when someone I respect gives me a precious piece of information that enables me to continue an exploration into whatever subject has seized - nay, enthralled, .......

276: Tubes Asylum, THANK YOU!!! wonderfully helpful post, I shalll.... (0.00)
Posted by radiance on 2006-06-21, 13:03:10 (72.201.10.143)
....do so at once. All. Y'know, I think there are two essentially different types of human beings when it comes to this kind of thing: those who value the actual experience of taking something apart, .......

277: Vinyl Asylum, any clues as to ingredients? it sounds great, but.... (0.00)
Posted by radiance on 2006-06-21, 12:25:29 (72.201.10.143)
...the germicidal part always worries me; as a doc, i know from a study that was done that germicidals can actually cause mroe problems than they fix, and we now know - this is a bummer to all of us w .......

278: Tubes Asylum, Re: I was thinking,..thanks again, appreciate it, and.... (0.00)
Posted by radiance on 2006-06-20, 21:30:30 (72.201.10.143)
...actually the materials part ain't so tough. In the first place, I have a good idea of what I'll find. For example, the plate is likely to be tantalum or aluminum or maybe copper or in at least one .......

279: Tubes Asylum, Re: sort of pointless...HMMMM, I don't remember.... (0.00)
Posted by radiance on 2006-06-20, 21:16:02 (72.201.10.143)
...saying it was anything more than an interesting intellectual excercise - or are interesting intellectual excercises not allowed on this forum? Sheez, what a killjoy you are. Now don't take offense! .......

280: Tubes Asylum, Re: Interesting project - thanks, i agree.... (0.00)
Posted by radiance on 2006-06-20, 21:10:23 (72.201.10.143)
...and your point about barium oxide is well taken. luckily, i have a biohazard hepa hood in my lab, so i can open the tube, wash all the powder out, and measure the elements at my leisure without wor .......

281: Tube DIY Asylum, what does OTOH stand for?....just kidding!!!!...... (0.00)
Posted by radiance on 2006-06-20, 18:36:53 (72.201.10.143)
....however, I gotta tellya Jeff, I do appreciate your thoughts, and I certainly know (from medicine) that sometimes the stupidest things can get stuck in concrete and resist change unbelievably - but .......

282: Tube DIY Asylum, thanks for the info jeff. yeah, jim has been very helpful... (0.00)
Posted by radiance on 2006-06-20, 18:22:19 (72.201.10.143)
...and I appreciate it. I have these power supply toroids i bought (Toroid Corporation of Maryland), where they come with the primary already on it, and you wind your own secondary? (I haven't done it .......

283: Vinyl Asylum, surely someone must make a vacuum cleaner..... (0.00)
Posted by radiance on 2006-06-20, 18:10:57 (72.201.10.143)
....that would automatically clean the record groove ahead of the cartridge. Does anyone know? If not, I'll invent the thing. If I make it, and it works very nicely, would I have any customers? If you .......

284: Tube DIY Asylum, Re: Then again...........you gotta point!!!............ (0.00)
Posted by radiance on 2006-06-20, 13:54:38 (72.201.10.143)
you gotta point. i'll do all three actually; get the new caps so i can put it together for my daughter and not have to worry about it; get the esr meter later so i have one (one can never have too man .......

285: Tubes Asylum, looking for no-longer-usable tubes to make..... (0.00)
Posted by radiance on 2006-06-20, 13:34:44 (72.201.10.143)
....a table of measurements and materials to satisfy intellectual curiousity. Here's what I would like to do: bust open certain tubes that are burnt out - in particular, the following: 45, 2A3, 813, 8 .......

286: Tube DIY Asylum, what does NFB stand for? I've been puzzling over .... (0.00)
Posted by radiance on 2006-06-20, 05:33:13 (72.201.10.143)
...it for too long now, and drawing a blank. obvious, I'm sure, once I know. by the way, Jeff, pardon my ignorance, I'm still just catching the tail end's of this apparently epic battle, do you make/s .......

287: Tube DIY Asylum, thanks j rodney for the tip, I'll check ESR before.... (0.00)
Posted by radiance on 2006-06-20, 05:27:39 (72.201.10.143)
....reforming, then recheck after, and post what happened here along with the brand(s) on the can(s) in the kit. best :) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to d .......

288: Tubes Asylum, thank you!!!! this is what i've been saying for the last.... (0.00)
Posted by radiance on 2006-06-19, 22:24:33 (72.201.10.143)
....month. the SET may be constant current sourced averaged out, but dyamically in the moment with each wave it's ROCKIN' the power supply. this is why choke loading the plate in a SET if perfectly do .......

289: Tube DIY Asylum, oh this is seriously cool, i happen to have a.... (0.00)
Posted by radiance on 2006-06-19, 22:17:05 (72.201.10.143)
,,,,extra 380 volt secondary ps tx, bridge, caps, etc, so will do. does it have to be 400 volts on the button? can it be a little under? does it hurt to go too much higher? "It ain't a comeback until .......

290: Tube DIY Asylum, i will thanks very much very cool (0.00)
Posted by radiance on 2006-06-19, 22:15:24 (72.201.10.143)
coolness. life. audio. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor .......

291: SET Asylum, A Quaker sounds exactly right....very cool........ (0.00)
Posted by radiance on 2006-06-19, 12:07:35 (72.201.10.143)
.....it's a great message to live by, actually, it cuts through the liberal-guilt-paralysis crap, provides appropriate protection, and gives ample warning of intention. I like it a lot. I do actually .......

292: SET Asylum, Naz thank you very much; I understand now. I will.... (0.00)
Posted by radiance on 2006-06-19, 11:46:21 (72.201.10.143)
...email you. Oh, yeah, going down this path, you betchyerbooties. I think maybe high quality tx for the input; this allows for both balanced and unbalanced inputs, giving tons of flexibility for inpu .......

293: Tube DIY Asylum, thank you very much. I googled it, found it, and.... (0.00)
Posted by radiance on 2006-06-19, 00:19:30 (72.201.10.143)
...tomorrow I'll be gittin' me wan!!!! Oh, I dearly love a good test tool....I'm about to learn about testing electrolytic capacitors. Now, that's fun!! Thanks again. Life. Audio. "It ain't a comebac .......

294: Tube DIY Asylum, question for Poinz: does this noise advantage only.... (0.00)
Posted by radiance on 2006-06-19, 00:15:18 (72.201.10.143)
...apply to push-pull? I'm designing up a SET 813 which will have positive and negative rails for the output, with ground in the middle; how does noise figure into this setup? Or is the question irrel .......

295: SET Asylum, this helps tremendously, thanks. I was wondering about... (0.00)
Posted by radiance on 2006-06-19, 00:10:56 (72.201.10.143)
...that coupling cap; I am very relieved to know that the thing has to be direct coupled anyway, and with a driver with really low impedance i don't see a need for the stopper resistor; if it's going .......

296: Tube DIY Asylum, whether or not to use original electrolytics in n.o.s. kit..... (0.00)
Posted by radiance on 2006-06-18, 20:36:52 (72.201.10.143)
...in the heathkit aa-32 amp kit I bought from peter in the classifieds (what a find!!!!!!!!!!!!!!! opening the box was like being a teenager again!!!!! heathkit could pack a box, baby!!!!). anyway, t .......

297: SET Asylum, thanks for the tips; three power supplies is no..... (0.00)
Posted by radiance on 2006-06-18, 19:47:52 (72.201.10.143)
....problemo; I have these toroids already with the primary windings already on them, all I have to do is add the secondaries according to exactly what I want. So the iron is covered; the big question .......

298: Tube DIY Asylum, good heavens, no, i would never hack anything.... (0.00)
Posted by radiance on 2006-06-18, 18:00:46 (72.201.10.143)
....where do people get these suspicious ideas? I've never so much as cheated anyone out of a nickel my whole life, it just amazes me when someone accuses me of anything, although i certainly have sto .......

299: SET Asylum, thanks, jim, you betcha, i got that - we are talking A2... (0.00)
Posted by radiance on 2006-06-18, 14:17:26 (72.201.10.143)
....for BRIEF moments only, so it really becomes a delicate balancing act so all the conditions are right. drive that tube into A2 too long and the grid distorts/melts/breaks contact/gnarlifies and th .......

300: SET Asylum, thanks for the correction, gianluca, very much...... (0.00)
Posted by radiance on 2006-06-18, 14:00:58 (72.201.10.143)
....appreciated :) I am gnawing on it, when I "get it" I'll post back to you to see if I reached the correct intuitive understanding. I DO have a starting point: that is realizing that the root mean .......

301: Tube DIY Asylum, message to other member username RADIANCE.... (0.00)
Posted by radiance on 2006-06-18, 13:57:23 (72.201.10.143)
....sorry, when I joined this forum I didn't realize someone was already using RADIANCE as a username; I have tried to change it without success, for some reason the forum doesn't LIKE members trying .......

302: SET Asylum, VERY COOL ANALOGY but actually I prefer..... (0.00)
Posted by radiance on 2006-06-18, 13:52:42 (72.201.10.143)
...lots of cubic inches for low end torque AND a turbo (not a supercharger) for middle and high rev power; the turbo doesn't kick in until past - say - 30 mph, but when it does, hold on!! In the meant .......

303: SET Asylum, thanks, gianluca, yes i see the aikido is too high.... (0.00)
Posted by radiance on 2006-06-18, 13:40:43 (72.201.10.143)
...impedance, IT tx too expensive and tricky, so that definitely means cathode follower driver, which is a great use for the cathode follower circuit anyway; allow the output tube - the 813 - to work .......

304: SET Asylum, Re: max SET power - thanks, great articles (0.00)
Posted by radiance on 2006-06-18, 12:29:49 (72.201.10.143)
I am digesting the link articles greedily; it will take me a day or two to be ready to answer your questions re tube parameters, etc, but I WILL do so. just in general: my plan is to use the 813, to b .......

305: SET Asylum, thanks, yeah that's what i meant, i just didn't say.... (0.00)
Posted by radiance on 2006-06-18, 00:13:57 (72.201.10.143)
...it clearly, although I completely missed the point that without a low enough impedance driving the grid when it goes into A2 (positive conduction) it would cause frequency non-linearity. would high .......

306: Tubes Asylum, yeah, search for some guys in canada called.... (0.00)
Posted by radiance on 2006-06-17, 23:44:17 (72.201.10.143)
....London Power; they publish a five volume master set of books on the electronics of guitar amps, and if it ain't in one of their books, I am willing to bet Kevin at the phone number can tell you. y .......

307: Tube DIY Asylum, actually, there's no free ride on anything; if you have... (0.00)
Posted by radiance on 2006-06-17, 23:40:48 (72.201.10.143)
...atrial fibrillation (like me and a few million other older Americans) fish oil - even Nordic Natural - makes the atrial fib worse, so I don't know whether to take it or not. if you don't have atria .......

308: SET Asylum, the implication of a graphite plate or a lower purity.... (0.00)
Posted by radiance on 2006-06-17, 23:28:46 (72.201.10.143)
...tantalum plate is that the outgassing of carbon or impurities will shorten the life of the tube? would it lead to arcing in the tube, simply destroying the inner structure? "It ain't a comeback unt .......

309: SET Asylum, Re: A1 and A2 - low impedance driver stage (0.00)
Posted by radiance on 2006-06-17, 23:25:40 (72.201.10.143)
what i understand now about biasing for class A with the ability of high volume peaks to drive the tube temporarily into A2 (grid positive) is that the driver stage has to have low output impedance, s .......

310: SET Asylum, i forgot to mention - yeah if you want a truly giant.... (0.00)
Posted by radiance on 2006-06-17, 23:16:52 (72.201.10.143)
...SET you should commission Jim or someone of his experience and knowledge - anyway, I forgot to mention that the actual power output of a SET is (change in voltage) times (change in current) multipl .......

311: SET Asylum, douglas where did you get that tag line? (0.00)
Posted by radiance on 2006-06-17, 19:10:54 (72.201.10.143)
it is fabulous. is it a quote? did you make it up? if you made it up, then it is brilliant. if it is a quote, then it is brilliant anyway. "It ain't a comeback until it's left the shop" Jimmy Dunne, t .......

312: SET Asylum, other members are far more qualified than me to.... (0.00)
Posted by radiance on 2006-06-17, 19:07:04 (72.201.10.143)
...answer this, but i would just point out that volts and watts are not the same thing. watts is power, the measure of work; volts are a measure of potential energy in terms of difference in number of .......

313: Tube DIY Asylum, thanks. got it. yeah, i'm building a very standard..... (0.00)
Posted by radiance on 2006-06-15, 16:51:39 (72.201.10.143)
....300B SET as we speak; really looking forward to firing it up. I'm just thinking into the future; I do want to do one higher voltage SET amp, and just doing my research so when the time comes I am .......

314: Tube DIY Asylum, nah, you got it right, just my inexperience with this.... (0.00)
Posted by radiance on 2006-06-15, 16:47:46 (72.201.10.143)
...whole subject, still learning the basics. got it. thanks a million. simple, once understood. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster th .......

315: Tube DIY Asylum, oh, of course!! thank you very much. (0.00)
Posted by radiance on 2006-06-15, 16:46:39 (72.201.10.143)
very cool indeed. thanks again; its members like you who make this forum so wonderful. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mp .......

316: Tube DIY Asylum, a really good question - another possibility just.... (0.00)
Posted by radiance on 2006-06-15, 16:44:46 (72.201.10.143)
...ocurred to me. maybe we're making a huge wrong assumption. just because the mercury disappears from the bottom of the tube as a pool of liquid metal doesn't mean it got out. maybe it was transforme .......

317: Tube DIY Asylum, yeah, you're right on both counts. river fish is.... (0.00)
Posted by radiance on 2006-06-15, 16:38:00 (72.201.10.143)
...seriously toxic just about anywhere in america. my point - i see there are already emotionally reactive posts happening, not yours, but up above in the thread i notice posts with subjects like "thi .......

318: Tube DIY Asylum, HEAR! HEAR! (0.00)
Posted by radiance on 2006-06-15, 11:44:32 (72.201.10.143)
Well, I'll be - finally a message from the peanut gallery that has value. As a doc, I gotta tellyall you should NOT mess with mercury tubes PERIOD. They are dangerous; elemental mercury itself is not .......

319: Tube DIY Asylum, how to achieve cathode biasing 813? (0.00)
Posted by radiance on 2006-06-15, 11:21:25 (72.201.10.143)
just saw Pete Millet's schematic for the 813 amp he built; very cool indeed, esp his microprocessor-protected and sequenced PS. However, I noticed he used fixed bias rather than cathode biasing - the .......

320: Tubes Asylum, oh, guano! i'm glad to know the eh version won't melt- (0.00)
Posted by radiance on 2006-06-15, 11:12:10 (72.201.10.143)
down, but the sounding like guano part is certainly discouraging. Any ideas on what mods or mode might make them sound better? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man .......

321: SET Asylum, Re: really good points. the 2nd and 3rd harmonics are... (0.00)
Posted by radiance on 2006-06-15, 00:43:50 (72.201.10.143)
Thanks for your experience. It is so interesting to me how often the 45 SET comes up as the best, with a few nods to the 2A3 also, even though by the specs both are way low powered compared to virtual .......

322: Tubes Asylum, so i have 4 kt90eh's i haven't built an amp for yet - are... (0.00)
Posted by radiance on 2006-06-15, 00:03:22 (72.201.10.143)
...these things hopeless? there have been some posts about these shorting out - can these kt90's from electro-harmonix be used; if so, what parameters do I have to stay within so they don't self-destr .......

323: Tubes Asylum, Re: Here THANKS!!!! (NT) (0.00)
Posted by radiance on 2006-06-14, 17:31:14 (72.201.10.143)
THANKS "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for taking .......

324: Tubes Asylum, specifications for 6C33C-B, does anyone have them or... (0.00)
Posted by radiance on 2006-06-14, 12:24:07 (72.201.10.143)
...the link to get to them? I couldn't find anything on the tube data locator link, duncan's, etc, etc, googled for pages and pages, and for some reason - this is very strange - i simply could not fin .......

325: SET Asylum, thanks jim and naz, this really helps focus (NT) (0.00)
Posted by radiance on 2006-06-13, 23:07:26 (72.201.10.143)
thanks again (huh - it won't let me post without putting a message in here.) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he .......

326: SET Asylum, Re: What about A2? (0.00)
Posted by radiance on 2006-06-13, 22:59:10 (72.201.10.143)
This A2 capability for peaks in the music is a new idea to me, very very intriguing. NAZ posted that he runs the 845 into A2 and it works well, so that makes two tubes now that will go into A2; I wond .......

327: SET Asylum, really good points. the 2nd and 3rd harmonics are... (0.00)
Posted by radiance on 2006-06-13, 22:03:41 (72.201.10.143)
...simpy the doubling and tripling of the frequencies of the original signal. according to others with experience, the human ear likes doubling of frequencies just fine but doesn't care for tripling; .......

328: SET Asylum, thanks for the info, this is good to know. actually.... (0.00)
Posted by radiance on 2006-06-13, 21:57:08 (72.201.10.143)
...I have both the 6.5" and 8" audio-nirvana full-range speakers, and I am making my own design cabinet with a folded horn, and REALLY HOPING I can get good sound out of them as full-range drivers. I .......

329: SET Asylum, wow, this helps a great deal, thanks. After.... (0.00)
Posted by radiance on 2006-06-13, 19:46:24 (72.201.10.143)
...considering the whole matter more, with input, I did realize that the 833A was simply overkill, and I do know of only one example, which I've never heard, so the prospect of spending all that money .......

330: SET Asylum, 45's look really good, but question re 3rd harmonic... (0.00)
Posted by radiance on 2006-06-13, 07:51:42 (72.201.10.143)
when I looked up the data sheets on the 45, they all said that the 3rd harmonic was the dominant harmonic, even in class A. this surprised me, because i thought triodes were dominant 2nd harmonic and .......

331: SET Asylum, ahah! now this is interesting. the 45 you heard, (0.00)
Posted by radiance on 2006-06-12, 22:55:11 (72.201.10.143)
do you know if it was SET or PP? do you remember the name of the amp? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the .......

332: SET Asylum, Re: What are the real goals? sigh, you gotta point..... (0.00)
Posted by radiance on 2006-06-12, 21:30:08 (72.201.10.143)
.....yes, now that my initial crazed enthusiasm for the IDEA has worn off a little, I see the problem: paralleling a bunch of lower voltage tubes, while a huge waste of components, is a HECKUVALOT SAF .......

333: SET Asylum, Re: also... (0.00)
Posted by radiance on 2006-06-12, 21:14:37 (72.201.10.143)
Hi Ed, thanks for the caution, I totally agree this is not a game with these voltages. Yeah, I'm actually good at figuring out things like how to lay out a high voltage circuit so it's safe, durable, .......

334: Vinyl Asylum, Re: An article about the explosion of vinyl sales in the UK... (0.00)
Posted by radiance on 2006-06-12, 20:26:42 (72.201.10.143)
I think one of the most important reasons many people are starting to turn away from CD and back to vinyl is - oddly enough - durability. I am so fed up with how easily a CD is ruined by scratches - a .......

335: Tube DIY Asylum, Re: And now for something completely different... (0.00)
Posted by radiance on 2006-06-12, 07:11:17 (72.201.10.143)
May I suggest a looooooong stick? I like his scheme very much; I was starting to think along the same lines, although I wanted to look into tube regulators instead of mosfet (although of all the solid .......

336: Tube DIY Asylum, I agree - it's NOT - when subjects carry emotional.... (0.00)
Posted by radiance on 2006-06-12, 06:29:56 (72.201.10.143)
....history. Thus my spontaneous, naive, pefectly-innocently-intended little complaint about getting burned out on how impressive and pursuasive each amp-maker's website is, got me several dumpster -l .......

337: Tube DIY Asylum, you've got to be kidding. (0.00)
Posted by radiance on 2006-06-12, 00:22:38 (72.201.10.143)
not impressed. AT ALL. uh, like, where are the pictures of the INSIDE. Isn't the INSIDE we're talking about here? Sigh. This is moronic. Jeff, are you just making this guy up and posing as him? These .......

338: SET Asylum, 833A vs 3-500Z vs GS35B vs 450TL shootout (corrected)!!! (0.00)
Posted by radiance on 2006-06-11, 23:01:07 (72.201.10.143)
Which is better, or do you have another possibility? I am looking for the ultimate SET tube, WAY MORE POWERFUL than what is currently in manufacture, one that would allow a SET amp to be seriously pow .......

339: SET Asylum, Re: Actually.... (0.00)
Posted by radiance on 2006-06-11, 22:47:03 (72.201.10.143)
Oops!!! Blast it, I goofed in my question. I should not have said "in current manufacture". You're absolutely right; the tubes you list are the only choices in terms of current manufacture. I SHOULD H .......

340: SET Asylum, request for theory lesson: why is higher mu a.... (0.00)
Posted by radiance on 2006-06-11, 22:12:45 (72.201.10.143)
...problem for an output tube for a SEA amp? nc in his response to my 833a vs 3-500z shootout post cautioned me that the 160 mu of the 3-500z would be too much. I appreciate the advice; I would like t .......

341: Tube DIY Asylum, where is the picture? a lot of claims, no see proof. (0.00)
Posted by radiance on 2006-06-11, 19:53:48 (72.201.10.143)
jeez, and I thought I was a nut........ where's the picture? did I miss it somewhere back in this guy's rant days/weeks ago? "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man t .......

342: SET Asylum, GL833A versus 3-500Z SHOOTOUT!! WHICH IS BETTER? (0.00)
Posted by radiance on 2006-06-11, 19:50:23 (72.201.10.143)
OK, unless someone comes up with something even more bizarre, I've narrowed my quest for the BIG TUBE for a POWERFUL Single Ended Class A amp to two tubes: either the GL833-A or the 3-500Z. I toyed wi .......

343: SET Asylum, Re: Is the 280kg. a typo? Now I would really like to see a pic. (nt) (0.00)
Posted by radiance on 2006-06-11, 19:39:21 (72.201.10.143)
I have the pictures Reinout took of his system; they are incredible. Can you tell me how to post them? I don't have the faintest idea how to do it, but if it's not too hard I'll give it a shot. I aske .......

344: SET Asylum, Re: power calcs THANK YOU (0.00)
Posted by radiance on 2006-06-11, 06:43:15 (72.201.10.143)
thanks, ffrr, I get it, those differences represent the actual work peformed driving the speaker - the present cathode current is unchanging until there's a signal, so the output tx is not changing se .......

345: SET Asylum, Re: Try the 833a ! Thanks!! (0.00)
Posted by radiance on 2006-06-10, 23:26:43 (72.201.10.143)
Aha! I had a feeling that out there was a monster I didn't know about. I shall email you for the pics, you betcha. Thanks very much. So, I see, I got lead astray by my power calcs: I figured power out .......

346: SET Asylum, what is the ultimate currently produced SET tube? (0.00)
Posted by radiance on 2006-06-10, 21:58:18 (72.201.10.143)
I have kinda settled on the 300B, especially in parallel, that's the design i'm going for, but before I totally commit to this I'd like everyone's advice: is the 300B the ultimate currently produced t .......

347: Tube DIY Asylum, sorry i meant to say SE class A, yes, PP can be (0.00)
Posted by radiance on 2006-06-10, 17:28:43 (72.201.10.143)
class A, certainly, I just personally prefer SE over PP, although I certainly see why people go with PP for the power. i was just kidding about wasting good 300b's on PP; they seem well suited to SE. .......

348: Tubes Asylum, yeah, i think everyone is referring to cathode biasing, (0.00)
Posted by radiance on 2006-06-10, 17:10:47 (72.201.10.143)
so it would be the cathode resistor that goes. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove .......

349: Tubes Asylum, just what i was going to say (0.00)
Posted by radiance on 2006-06-10, 17:09:47 (72.201.10.143)
point to point is a pain and takes longer, but boy is it easier to repair! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he ha .......

350: Tube DIY Asylum, Re: HIGH DCR (LOW FI) PSU: a few preliminary results (LONG) (0.00)
Posted by radiance on 2006-06-10, 15:21:25 (72.201.10.143)
nice. i did the math along with you, and this makes sense. i wish i could see the scope pics; i couldn't get the links to work; don't know how to use imageshack. critical damping, RC way less than 10 .......

351: Tube DIY Asylum, found out by experience 6 volt ic won't work, so the idea (0.00)
Posted by radiance on 2006-06-10, 14:50:16 (72.201.10.143)
of pulling it up above ground is great - that's what I'll do. silly me, I forgot that those IC's need at least 2 volts headroom to work properly, but I have it working now nicely without them at 5.96 .......

352: Tube DIY Asylum, pulling it up to 40 volts fabulous idea; thanks (0.00)
Posted by radiance on 2006-06-10, 14:48:12 (72.201.10.143)
the beauty of a transformer; the voltage can be pulled up enough above ground to eliminate hum from that source, anyway. thanks "It ain't a comeback until it's left the shop" Jimmy Dunne, the first ma .......

353: Tube DIY Asylum, does anyone know whether grounding one side (0.00)
Posted by radiance on 2006-06-09, 22:37:03 (72.201.10.143)
of the heater supply make a difference in noise? i am bridge rectifying and filtering the 6.3 volt secondary of my power transformer for the 6l6gc tube screamer tone guitar amp i'm building for my son .......

354: Tweakers' Asylum, Re: good god, now i have seen it all. (0.00)
Posted by radiance on 2006-06-09, 19:37:50 (72.201.10.143)
on the other hand, reminding myself that we humans are quintessentially analog critters, why not a lacquer that improves tone? as crazy as it sounds. "It ain't a comeback until it's left the shop" Jim .......

355: Tweakers' Asylum, Re: boy are you dating yourself! (0.00)
Posted by radiance on 2006-06-09, 19:34:51 (72.201.10.143)
just kidding. you must know some serious electronics history. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehea .......

356: Tweakers' Asylum, Re: i wonder if the value steps originated from... (0.00)
Posted by radiance on 2006-06-09, 19:32:46 (72.201.10.143)
the earliest circuits being dependant upon voltages derived from batteries; for example, 12 volts being (12.6 if i remember right) one standard set of lead/sulfuric acid cells, etc., so it just worked .......

357: Tube DIY Asylum, aha! this is great to know, (0.00)
Posted by radiance on 2006-06-09, 14:51:28 (72.201.10.143)
i'm glad to find that out. mr. jeff, you da man!! this thread goes back so far, in it's varied branches, that i've just caught the tail-ends of the argument, still finding out all the pieces. i'm goin .......

358: Vinyl Asylum, Re: 'Splain this phenom- (0.00)
Posted by radiance on 2006-06-09, 00:22:05 (72.201.10.143)
i like the static charge attraction theory, probably right. but i think maybe another poss is that the stylus isn't just resting there. it's vibrating. from anything; earth noise, pad noise, elevator .......

359: Tube DIY Asylum, Re: 300B kits (0.00)
Posted by radiance on 2006-06-08, 23:24:47 (72.201.10.143)
good god, please forgive me in advance, but why would you want to waste four perfectly good 300b's in a PP? they would sound so much better in pure A. "It ain't a comeback until it's left the shop" Ji .......

360: Tube DIY Asylum, Re: REALLY low DCR (0.00)
Posted by radiance on 2006-06-08, 23:21:34 (72.201.10.143)
great story, love it. there's really nothing new, is there? a couple days ago, i was working on a lcdisplay for the cathode current (millivolts across a 1 ohm resistor equalling the millamps) in a 6l6 .......

361: Tube DIY Asylum, Re: lasercutting chassis (0.00)
Posted by radiance on 2006-06-08, 01:52:01 (72.201.10.143)
i would go with basstardo; aluminum is the metal of choice. why this thing of steel chassis got started is beyond me; steel is a lousy choice and always will be. if it's gonna support heavy iron, fine .......

362: Tube DIY Asylum, yes (0.00)
Posted by radiance on 2006-06-08, 01:49:11 (72.201.10.143)
yeah, that should work, assuming the watts are within range. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead .......

363: Tube DIY Asylum, Re: Is a newbie in great danger in changing capacitors? (0.00)
Posted by radiance on 2006-06-08, 01:44:35 (72.201.10.143)
you need a bag of jumpers (with alligator clips on each end), a cheap volt/ohmeter, a pair of needlenose with insulated handles, and any resistor larger than a hundred kilohm. really. cut one of the j .......

364: Tube DIY Asylum, Re: a simple proposal........ (0.00)
Posted by radiance on 2006-06-08, 01:06:19 (72.201.10.143)
yeah, i'm making a huge assumption which could turn out to be completely wrong when i finally get my hands on a really really really fast storage scope or card. if those spikes aren't there, then i ha .......

365: Tube DIY Asylum, a simple proposal........ (0.00)
Posted by radiance on 2006-06-07, 21:49:08 (72.201.10.143)
i think i know the way to solve this debate, but I'm an experimentalist by nature, so this probably won't satisfy the theorists - HOWEVER, here is how I would solve this argument, and will do it mysel .......

366: Tube DIY Asylum, Hear! Hear! (0.00)
Posted by radiance on 2006-06-07, 20:47:37 (72.201.10.143)
yeah, baby, that's what it should be all about. i really appreciate the theory guys, because they get me pointed in the right direction, but i know from many years of very productive experience that - .......

367: Tube DIY Asylum, Re: DIY Chassis for Amps - Penn Fabrication (0.00)
Posted by radiance on 2006-06-07, 20:34:58 (72.201.10.143)
andy, nice tip. yeah, i found out that using extrusion sides with endplates that screw into some of the extrusion grooves makes shielding different parts of various amp designs i'm working on a snap - .......

368: Vinyl Asylum, Re: The Blacksmith by Richard Pryor (0.00)
Posted by radiance on 2006-06-07, 20:14:02 (72.201.10.143)
this is one seriously funny record!!!!! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I .......

369: OTL Asylum, Re: What is an "array" loudspeaker? (0.00)
Posted by radiance on 2006-06-06, 23:19:04 (70.190.244.87)
line arrays CAN be mega cool. they have pros and cons. first, if the baffle is a verticle flat plain, you may get comb filtering, with nodes and dropouts. if the front baffle is curved in so the overa .......

370: OTL Asylum, Re: If so,... (0.00)
Posted by radiance on 2006-06-06, 23:13:27 (70.190.244.87)
god, no, bose is the opposite of a well-done array; bose is mush sound all over the place with no really good stereo image anywhere. bose was a fad; i got snookered into thinking they were good for a .......

371: OTL Asylum, Re: This is an line array speaker.. (0.00)
Posted by radiance on 2006-06-06, 23:11:23 (70.190.244.87)
wow, very cool, and you built them yourself. nice. i notice they are straight up and down; according to theory, you might have noticed some nodes and dropouts as you moved your head around - did you? .......

372: OTL Asylum, Re: Question or two for radiance (0.00)
Posted by radiance on 2006-06-06, 14:34:21 (70.190.244.87)
Hi Duke, well, now, that's a good question. hadn't thought about providing that option, but by gum it is a possibility. Yes, it's a vertical line array, BUT with some special tweaks of angles to avoid .......

373: Vinyl Asylum, Re: Methinks you are referring to a cutting lathe, no? /nt\ (0.00)
Posted by radiance on 2006-06-06, 14:15:34 (70.190.244.87)
yes, Henry, thanks! that's exactly it - a record lathe! lathe was the word I couldn't remember. I think maybe a Presto might be a used one i might be able to score somewhere. Also there's scully, and .......

374: Vinyl Asylum, Re: vinyl mastering table (0.00)
Posted by radiance on 2006-06-06, 14:13:21 (70.190.244.87)
super, thanks. I found via google there's a record lathe called a Presto (forget the model number but I've got it saved somewhere here....) - and, yes, letting someone else do it is the wise thing to .......

375: Vinyl Asylum, vinyl mastering table (0.00)
Posted by radiance on 2006-06-06, 01:14:52 (70.190.244.87)
does anyone know of or have for sale a vinyl master cutter turntable? I am not using the correct name for it, I can't remember what they're actually called, but it's the device that actually cuts the .......

376: Speaker Asylum, Re: General Speaker Purchase Advice (0.00)
Posted by radiance on 2006-06-05, 22:46:19 (70.190.244.87)
If you can deal with making your own cabinets, go to commonsenseaudio and get a pair of the audio-nirvana 8's. I personally really like "point-source" full-range speakers; you can put them in a tuned .......

377: Tech Square, cool DIY toroids but question re blocking DC (0.00)
Posted by radiance on 2006-06-05, 13:38:51 (70.190.244.87)
I got a set of these cool toroids where the primary winding is already on, and you can put on your own secondary(s). they are intended for line tx's, not audio output. my q is this: having been told t .......

378: OTL Asylum, Re: reasonable email appreciated (0.00)
Posted by radiance on 2006-06-03, 01:21:48 (70.190.244.87)
From an email that for some reason didn't post to the thread, though it looked like it should. My response is at the bottom. Re: the strangest email. can anyone explain? ------------------------------ .......

379: OTL Asylum, Re: Yes - I will publically state my disgust . . . (nt) (0.00)
Posted by radiance on 2006-06-02, 17:37:04 (70.190.244.87)
like i posted to the other fellow: In Reply to: My crystal ball is down ;-) posted by Duke on June 1, 2006 at 23:58:47: yeah i agree with you under normal circumstances, but in this particular case i' .......

380: OTL Asylum, Re: My crystal ball is down ;-) (0.00)
Posted by radiance on 2006-06-02, 15:37:47 (70.190.244.87)
yeah i agree with you under normal circumstances, but in this particular case i've already repeatedly apologized, so I've had it with people continuing to beat me up. So, strange emails that appear to .......

381: Tube DIY Asylum, Re: tube amp in a PCB with a toroidal xformer beside it? (0.00)
Posted by radiance on 2006-06-02, 15:09:06 (70.190.244.87)
would wrapping the windings with sheet copper and grounding the copper sheathing work even better? or, for that matter, aluminum. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first .......

382: Tube DIY Asylum, Yippee! The fun is back!!! (0.00)
Posted by radiance on 2006-06-02, 15:03:51 (70.190.244.87)
I just got the Heathkit aa-151 I won on ebay, bought a turntable on sale (the portable numar), hooked it all up with some decent speakers I had, went to three vinyl stores in Tempe with my eldest son .......

383: OTL Asylum, the strangest email. can anyone explain? (0.00)
Posted by radiance on 2006-06-01, 23:31:38 (70.190.244.87)
Wow. Well, I thought I apologized enough. Would someone please explain the following email I received (directly, I think). I don't know whether it's offensive (in which case my answer is "whatever") o .......

384: High Efficiency Speaker Asylum, Re: It would look a bit like this \ from the side probaly a smooth curve up behind your main pair and then back and on (0.00)
Posted by radiance on 2006-06-01, 14:05:09 (70.190.244.87)
or if your celing is high enough, you could make a labyrinthine horn under the floor with the driver underneat behind you and the exit at the base of the wall in front of you. :) "It ain't a comeback .......

385: Tech Square, Re: You're welcome. (0.00)
Posted by radiance on 2006-05-31, 14:43:11 (70.190.244.87)
thanks, great quote - einstein was the dude! yeah, i take the warning very seriously, been jolted a few times in my youth; my electronic teacher (such a great guy) in jr. high would sometimes troubles .......

386: Tube DIY Asylum, Re: Dynaco 6B4G Conversion; What about those grid stop resistors? (0.00)
Posted by radiance on 2006-05-31, 14:36:38 (70.190.244.87)
very cool article, loved reading it. more info good. thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead .......

387: Tubes Asylum, Re: Iso-Sockets (0.00)
Posted by radiance on 2006-05-31, 14:06:13 (70.190.244.87)
thanks for the info; nothing like personal experience to separate reality from marketing. what is tube rolling? i've seen the term several times now, but haven't figured out what it means from context .......

388: Tubes Asylum, Re: Bill Perkins (0.00)
Posted by radiance on 2006-05-31, 14:03:43 (70.190.244.87)
thanks Stu, interesting. yeah, i'm planning to spring mount the chassis in a portable guitar tube amp I'm designing, and then resilient mount the tubes as well. "It ain't a comeback until it's left th .......

389: Tubes Asylum, Re: are tube sockets ever mounted resilient material? (0.00)
Posted by radiance on 2006-05-31, 14:01:59 (70.190.244.87)
thanks, very cool idea, lots of possibilities with that material, yes, should be able to take the heat within reason, and in my price range too "It ain't a comeback until it's left the shop" Jimmy Dun .......

390: Tech Square, Re: recommendations schematic drawing program? (0.00)
Posted by radiance on 2006-05-31, 13:58:52 (70.190.244.87)
thanks, fast eddy, great tip! I would never have known; i'll have to think about what chip i might use in a mostly tube application and check it out. "It ain't a comeback until it's left the shop" Jim .......

391: Tech Square, Re: DesignWorks ! (0.00)
Posted by radiance on 2006-05-31, 13:53:39 (70.190.244.87)
thanks, Jacques, I will check it out, and thanks for the very neat examples; full of very good info i am glad to have! "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to driv .......

392: Tube DIY Asylum, Re: Thinking out loud about switching noise and layout (0.00)
Posted by radiance on 2006-05-31, 13:48:04 (70.190.244.87)
Thanks both Henry and arend-jan; yes, of course, the regulator should have fast response; I also like arend-jan's outside the box thinking of inside shielded boxes! The idea of passing wires between c .......

393: Tubes Asylum, Re: How about these .... oophs..forgot url! (0.00)
Posted by radiance on 2006-05-30, 22:27:36 (70.190.244.87)
wow, how very very cool looking! the price is daunting, but thank you for the link this gives me a great starting place for thinking of how to make my own (cheapcheapcheap) thanks. "It ain't a comebac .......

394: Tube DIY Asylum, Re: And lastly, a new thought (0.00)
Posted by radiance on 2006-05-30, 21:51:58 (70.190.244.87)
been following this thread with FASCINATION. now I've recognized listening fatigue from solid state amps, no problem believing same is possible from extremely high freq noise from PS. propose possible .......

395: Tech Square, recommendations schematic drawing program? (0.00)
Posted by radiance on 2006-05-30, 19:15:37 (70.190.244.87)
What program for PC would anyone recommend for drawing schematics? I don't need analysis pgms, I just need something that draws schematics easily and SAVES ME TIME. Thanks in advance! "It ain't a come .......

396: Tech Square, Re: It is a sensible idea. (long) (0.00)
Posted by radiance on 2006-05-30, 19:13:34 (70.190.244.87)
Dear Cheap-Jacki, Thank you so much!! I will look up the sources you cite; get the Handbook ASAP; this is very very exciting. You know, exactly what you said was starting to percolate through my brain .......

397: Tubes Asylum, Re: Example....... (0.00)
Posted by radiance on 2006-05-29, 21:43:27 (70.190.244.87)
any co. selling a resilient mount? I'll try to find one of the ampex ones, google & ebay, so i can see; maybe make my own. thanks. also thinking about actually spring suspending chassis in a portable .......

398: Tubes Asylum, are tube sockets ever mounted resilient material? (0.00)
Posted by radiance on 2006-05-29, 19:50:52 (70.190.244.87)
I was wondering whether microphonics might be reduced and tube life lengthened if tube sockets were mounted in a resilient material, which would then be attached at outer edges to chassis, reducing vi .......

399: Tube DIY Asylum, Re: LMT SPECIAL's ordered! (0.00)
Posted by radiance on 2006-05-29, 15:21:37 (70.190.244.87)
no prob; googled magnequest and found an office of theirs right here in Phoenix AZ. Thanks I think. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faste .......

400: Tube DIY Asylum, Re: LMT SPECIAL's ordered! (0.00)
Posted by radiance on 2006-05-29, 12:30:40 (70.190.244.87)
what's the magnaquest part number? i think i'd like to order the same for my own present project. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster .......

401: SET Asylum, Re: There is a place where your thoughts may play ... (0.00)
Posted by radiance on 2006-05-28, 11:18:19 (70.190.244.87)
naw, thanks, I'm done. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor .......

402: SET Asylum, Re: Faloon Gong,,,,how about Jim Jones? (nt) (0.00)
Posted by radiance on 2006-05-28, 11:17:34 (70.190.244.87)
whatever "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar to prove it; I will always honor him for takin .......

403: SET Asylum, public retraction China query (0.00)
Posted by radiance on 2006-05-27, 21:08:51 (70.190.244.87)
Sorry. I should have known better. I take it all back. Please delete whole thread. Beginner's mistake; won't do it again. Fact remains China is imprisoning and torturing Faloon Gong religion practitio .......

404: SET Asylum, Re: ..And what would you have left if you threw out everything you have labeled: (0.00)
Posted by radiance on 2006-05-27, 21:05:14 (70.190.244.87)
nt hv mch (trng 2 b mr concise) bt @ lst i wld not b hlpng regime tht s stll pttng faloon gong (sp?) mmbrs nto prsn & torturing thm. "It ain't a comeback until it's left the shop" Jimmy Dunne, the fir .......

405: OTL Asylum, public apology for atma-sphere post (0.00)
Posted by radiance on 2006-05-27, 21:01:33 (70.190.244.87)
My bad. I hereby publicly apologize. I received a very gracious email from one of the people at the company, and realized that: from now on, I must be far kinder and gentler to manufacturers; they hav .......

406: Tubes Asylum, Re: I've tested lots of 'N7s in the frontends of my ASL Hurricanes. My favorite is the Ken-Rad staggerplates... (0.00)
Posted by radiance on 2006-05-27, 15:11:25 (70.190.244.87)
If anyone else hasn't snapped them up, I'd happily buy the whole kit and kaboodle; tell me how to send how much where. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to driv .......

407: Tubes Asylum, Re: ideal low voltage SET tube? (0.00)
Posted by radiance on 2006-05-27, 12:44:25 (70.190.244.87)
Tom, Thanks a million!! This circuit gives me tremendous food for thought; I have started digesting it, will probably build it as is for the fun of it and as a reference, and then about three or four .......

408: SET Asylum, Re: CSEP (Chinese Single Ended Pentode) proposal (0.00)
Posted by radiance on 2006-05-27, 10:59:42 (70.190.244.87)
I don't mind if it's taken off. I was just hoping for someone with insight to post before it was yanked. The topic is thought-provoking; I would argue that it is only inflammatory when people react ir .......

409: SET Asylum, Re: THIS IS GARBAGE (0.00)
Posted by radiance on 2006-05-27, 07:23:52 (70.190.244.87)
Well, I would say that touched a nerve, eh? Naw, I wasn't lying, just thinking out loud in the post. You would be correct in saying SOME Christians want the whole world to be Christian, and I would ag .......

410: Tubes Asylum, Re: Sorry, one more (0.00)
Posted by radiance on 2006-05-27, 07:13:38 (70.190.244.87)
Victor, thank you very much. I will look all three up and find out about them. I like this possibility very much. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a V .......

411: SET Asylum, Re: Converting old amps......long text (0.00)
Posted by radiance on 2006-05-27, 02:53:08 (70.190.244.87)
oh, by the way, do the G's usually come with a schematic pasted inside, or do you know where it's posted, or can you email me one? This is very cool; I love getting my head inside an old design; I onc .......

412: SET Asylum, Re: CSEP (Chinese Single Ended Pentode) proposal (0.00)
Posted by radiance on 2006-05-27, 02:24:02 (70.190.244.87)
OK, I'm about to seriously offend all the Chinese members of this forum......and all the believers in being politically correct.....I am just putting this out to see what people think, I am NOT saying .......

413: SET Asylum, Re: Converting old amps......long text (0.00)
Posted by radiance on 2006-05-27, 02:08:54 (70.190.244.87)
Jimmy, Thanks!! Wow, this is very very cool. Dude, this is some serious scavenging brilliance, I'm in awe. I shall follow your advice to the letter and start monitoring ebay for the Hammond Model G's. .......

414: Tubes Asylum, Re: nope, it didn't do it again. (0.00)
Posted by radiance on 2006-05-26, 23:34:43 (70.190.244.87)
("Twilight" music from off-stage left. duh-duh-di-da....) "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead sc .......

415: Tubes Asylum, Re: huh. now that's weird. (0.00)
Posted by radiance on 2006-05-26, 23:33:15 (70.190.244.87)
I wonder why my posts now repeat my tag line twice. Let's see if it does it again..... "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mp .......

416: Tube DIY Asylum, Re: and to continue, now that i think more about it, (0.00)
Posted by radiance on 2006-05-26, 23:29:38 (70.190.244.87)
after the current increase from the load steadies, the extra emf built up around the choke windings then collapses partially, giving a "kick" to the capacitor, recharging it more quickly than would ha .......

417: Tubes Asylum, ideal low voltage SET tube? (0.00)
Posted by radiance on 2006-05-26, 22:49:49 (70.190.244.87)
yes, i can look it up for myself, but someone of you may already know the answer and save me time: for the fun of it, i am interested in the idea of a tube amp that would run with a lowly 130 volts of .......

418: Tube DIY Asylum, Re: Sort of, but not really. (0.00)
Posted by radiance on 2006-05-26, 22:44:57 (70.190.244.87)
thanks for the correction; i understand much better now. I'm sorry if my language was sloppy. still, i have to say that a choke DOES resist (via reactance) increased current drain, during the period w .......

419: OTL Asylum, Re: if their lips are moving... (0.00)
Posted by radiance on 2006-05-26, 22:33:40 (70.190.244.87)
well, i apologise for inadvertantly slandering your site. i wasn't reacting to your site specifically, i was just suffering from hype burnout. all the sites are so persuasive! in any case, i've now ha .......

420: Tech Square, Re: stupid question 2: why not just voltage doublers/triplers etc instead of heavy iron? (0.00)
Posted by radiance on 2006-05-26, 16:14:44 (70.190.244.87)
thanks, i get it. good point. i kindof had the feeling that the caps - which necessarily end up in series - would be the limiting factor; it would probably require such a huge amount of capacitance in .......

421: Tube DIY Asylum, Re: CLC and CRC question??? (0.00)
Posted by radiance on 2006-05-26, 05:58:13 (70.190.244.87)
simply the impedance of the PS is higher with a resistor, limiting it's ability to respond to high volume transients without B+ dipping; it's kind of like clipping in the PS rather than the output tub .......

422: SET Asylum, Re: consoles baby (0.00)
Posted by radiance on 2006-05-26, 05:49:46 (70.190.244.87)
thanks for the great info. consoles. now what are consoles? do you mean rack mount stuff? like out of old radio stations? or control consoles? oh, man, I'd love to get my hands on an old RCA tube disc .......

423: SET Asylum, Re: suggestions for old amps to look for on ebay? (0.00)
Posted by radiance on 2006-05-25, 21:42:56 (70.190.244.87)
hmmmm....goodwill, now there's an idea indeed. thanks. "It ain't a comeback until it's left the shop" Jimmy Dunne, the first man to drive a VW Beetle faster than 200 mph, and he has the forehead scar .......

424: SET Asylum, suggestions for old amps to look for on ebay? (0.00)
Posted by radiance on 2006-05-25, 20:48:40 (70.190.244.87)
Besides Mac's (a nobrainer if it's busted and going CHEAP), any suggestions on GREAT old ampls that I might find busted and cheap on ebay, worth picking up and rebuilding? I'm wide open to suggestions .......

425: OTL Asylum, Re: Ask Atma-Sphere for one. I did and received it. (NT) (0.00)
Posted by radiance on 2006-05-25, 20:28:07 (70.190.244.87)
I've been laughing at myself all day after reading your post. Duh. Somehow it just didn't occur to me they'd send me one if I asked for it. I'll give it a try, maybe they'll still do it (or maybe they .......

426: Tube DIY Asylum, Re: CLCRC power supply config (0.00)
Posted by radiance on 2006-05-25, 20:26:32 (70.190.244.87)
I really liked Dale's answer; it is pretty comprehensive if you think it through and do as he suggests. I would add one note: there are only three reasons for a resistor instead of a choke in the powe .......

427: Tech Square, stupid question 2: why not just voltage doublers/triplers etc instead of heavy iron? (0.00)
Posted by radiance on 2006-05-25, 14:59:24 (70.190.244.87)
I am experimenting with direct coupled driver/output stage schematic ideas, and using an idea from an article written by Ari Polisols (The Direct-Coupling Modulated-Bias Circuit from GA Special 2002) .......

428: OTL Asylum, query: schematic or feedback re: Atma-Sphere amps (0.00)
Posted by radiance on 2006-05-25, 14:21:36 (70.190.244.87)
I just found the Atma-Sphere site - boy am I TIRED of OTL sites saying THEIR amp is the one and only, the best, the patented, etc, etc. Oorg. Ugh. (Really tired of b___s___ hype). NONETHELESS, I would .......

429: SET Asylum, Re: Speakers, xovers amplifiers and something to ponder. (0.00)
Posted by radiance on 2006-05-24, 20:54:07 (70.190.244.87)
Mr. Rankin, I just want to say that this posting you did was a revelation to me. I had no idea these frequencies were so low! Now I understand why the bass is so important; I guess I kind of had this .......

430: SET Asylum, Re: I was "hung by the thumbs" for talking about this 8 weeks ago! (0.00)
Posted by radiance on 2006-05-24, 15:03:38 (70.190.244.87)
you make a very very good point. that is really interesting, the idea that what is really attracting me is nostalgia; that is a very real emotion as one gets older (as I find out the hard way by getti .......

431: SET Asylum, Re: Guidance for 300b wannabe (Did you see this site?) (0.00)
Posted by radiance on 2006-05-24, 14:47:47 (70.190.244.87)
Wow, super site, great info, and boy can this guy make an amp look fabulous. Thanks for the tip. With his Mark 3 version he really gets into how good the Plitron toroid output tx is, but I am hoping t .......

432: Tubes Asylum, Re: Bye Bye Mullard 12AT7'S ! And .. The New Champion Is ... (0.00)
Posted by radiance on 2006-05-23, 22:27:35 (70.190.244.87)
death certainly sucks. if you would like, i would be happy to post my supplement formula for slowing aging way way down. i have been studying this for years and have used my own body as a lab rat, and .......

433: SET Asylum, Re: I was "hung by the thumbs" for talking about this 8 weeks ago! (0.00)
Posted by radiance on 2006-05-23, 22:08:04 (70.190.244.87)
repeat after me: tubes will never die. say it until enlightenment dawns. it DOES NOT MATTER how good solid state gets, tubes will never die. if you don't get it, there's no point in explaining it. all .......

434: SET Asylum, Re: Guidance for 300b wannabe (0.00)
Posted by radiance on 2006-05-23, 22:01:09 (70.190.244.87)
I just ordered all the goodies from Angela's for the 300B free project on that site; somebody please tell me I just did a good thing? Anyway, I would suggest you check it out, unless a whole bunch of .......

435: Tech Square, Re: using only about 20% of it's capability (0.00)
Posted by radiance on 2006-05-23, 21:54:14 (70.190.244.87)
Russ, I can't thank you enough; this is a godsend to me. I'm up to my eyeballs in alligators at the moment, so i haven't been able to dig into the graph yet, but i understand essentially what it's abo .......

436: Vinyl Asylum, Re: DAC? (0.00)
Posted by radiance on 2006-05-19, 18:10:18 (70.190.244.87)
wow. cool. is this a special laser cartridge that goes in the tonearm? or a whole new turntable thingy? does it work on old vinyl, or do you have to have special new vinyl encased in plexiglass whatev .......

437: Vinyl Asylum, Re: Radio Station Turntables? (0.00)
Posted by radiance on 2006-05-19, 18:04:59 (70.190.244.87)
i don't remember brandnames, etc, but i used to do work in radio engineering, and i certainly remember the oversized commercial turntables that were specially designed for oversized vinyl that was dis .......

438: Tech Square, Re: I'll link you to an article (0.00)
Posted by radiance on 2006-05-19, 17:52:15 (70.190.244.87)
Dude!! Thank you!!! I get it!!!!! If I use a transformer that transforms (heh heh) the 8 ohms of the speaker into an impedance closely matching the impedance of the triode output circuit, the triode i .......

439: Tube DIY Asylum, Re: 12at7 phono pre CAP and PHONO CART questions (0.00)
Posted by radiance on 2006-05-19, 17:40:49 (70.190.244.87)
Thanks!! Much appreciated!! By the way, I just found Angela's site, very cool, great concept, curious: their silver on paper in oil caps - do these caps really make a difference in sound? It's hard fo .......

440: Tube DIY Asylum, Re: 12at7 phono pre CAP and PHONO CART questions (0.00)
Posted by radiance on 2006-05-19, 15:38:52 (70.190.244.87)
Wow, this looks just like what I'm looking for myself...have an old turntable that needs a preamp. Two questions for anyone who might know: what's a good source for the nanofarad caps in the schematic .......

441: Tube DIY Asylum, Re: Amperage Rating Of Wires (0.00)
Posted by radiance on 2006-05-19, 12:51:32 (70.190.244.87)
Thanks! It's good to hear wisdom from someone who really knows from both the theory and the experience side together. I love this idea of silver over copper; this is new to me - what is a good oem sou .......

442: Tech Square, Re: Perhaps a simple solution: (0.00)
Posted by radiance on 2006-05-18, 15:35:46 (70.190.244.87)
here's a message i received from a non-member, i think i originated this string incorrectly so the replies are coming to my email instead of the forum, so i'm copying it here (pre-comment: he thinks I .......

443: Tech Square, Re: The answer to all your questions (0.00)
Posted by radiance on 2006-05-18, 15:16:55 (70.190.244.87)
Thank you so much; this is a tremendous help, and gets me on the right track. Do you mind discussing a little bit why the output tube should see an impedance 5 or 6 times higher than it's own impedanc .......

444: Tube DIY Asylum, Re: Amperage Rating Of Wires (0.00)
Posted by radiance on 2006-05-18, 15:04:51 (70.190.244.87)
I agree with everything everyone is saying, especially the really helpful link from maxhifi (thanks!!) but I would like to add, as a note of reassurance, that when you're doing hookup where it's just .......

445: Tube DIY Asylum, Re: I do like simplicity to a point...... (0.00)
Posted by radiance on 2006-05-18, 14:28:03 (70.190.244.87)
I agree; it has been a source of amazement to me the retail prices of tube amps. I think this market is way overpriced (and I intend to do something about it). Claims that amps have to cost thousands .......

446: Tech Square, Re: Perhaps a simple solution: (0.00)
Posted by radiance on 2006-05-18, 07:53:00 (70.190.244.87)
Thank you! Brilliant and elegant! (It was the same thought I had upon awakening this morning, so my subconscious was catching up to you during the night.) Yes, that is precisely the way to do it real .......

447: Tech Square, while i'm at it, where do i find specs kt-90? (0.00)
Posted by radiance on 2006-05-17, 22:16:43 (70.190.244.87)
I just picked up a matched pair of electro-harmonix kt-90's, but no spec sheet came with them. does anyone know where I can get a full spec sheet for the kt90eh? .......

448: Tech Square, measuring output impedance (0.00)
Posted by radiance on 2006-05-17, 20:46:54 (70.190.244.87)
In devising various experimental SET and class-A PP tube output configurations, how do I actually MEASURE the output impedance (rather than attempt to calculate it, which may or may not be real-world- .......

449: SET Asylum, stupid tetrode question (0.00)
Posted by radiance on 2006-05-17, 16:41:51 (70.190.244.87)
what happens in a SET design when the screen in a tetrode is simply left unconnected? I am familiar with hooking it to the plate (triode conversion, but high screen dissipation), hooking it to part of .......

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