|
Search of All Forums Enter your search criteria. Click here for tips on using our search |
For Sale Ads |
1: Tube DIY Asylum, Kicad (0.00)
Posted by RayP on 2024-04-01, 15:02:45 (1.146.45.175)
Kicad is free and very easy to use. There are numerous Youtube videos showing how to use it and as an example here is one showing the placing of lettering and diagrams on the Front Silkscreen layer. G .......
2: Tube DIY Asylum, RE: ultrasonic filament supply (0.00)
Posted by RayP on 2023-07-20, 14:57:28 (49.199.79.80)
Thanks for the info. ray .......
3: Tube DIY Asylum, RE: ultrasonic filament supply (0.00)
Posted by RayP on 2023-07-19, 20:31:48 (49.199.79.80)
Thank you. I'm redoing my GK71 amp that used these 110v modules now that I am in Australia and now have some 240 volt modules. I'll put some shielding around them. ray .......
4: Tube DIY Asylum, ultrasonic filament supply (0.00)
Posted by RayP on 2023-07-19, 15:25:51 (49.199.79.80)
Could you tell us more about this supply? ray .......
5: Tube DIY Asylum, RE: DIY Tube Amp Builders Dying (0.00)
Posted by RayP on 2023-04-05, 13:43:27 (149.167.135.115)
That's a good idea. I'll have to ty it. ray .......
6: Tube DIY Asylum, DIY Tube Amp Builders Dying (0.00)
Posted by RayP on 2023-04-04, 14:49:31 (149.167.135.115)
I've reached the old codger mark of 75 and have been giving away tubes and some iron that I will never use. Some to the local guitar tech and also a bloke of about 50 who is interested. He is now buil .......
7: Tube DIY Asylum, RE: LM317 Regulator (0.00)
Posted by RayP on 2023-01-02, 03:18:56 (149.167.151.127)
If you would like a long read, you could wade through a thread on DIYAUDIO about a noise canceler for an LM317 regulator. ray .......
8: Tube DIY Asylum, RE: Ultrasonic Filament Supplies (0.00)
Posted by RayP on 2022-09-20, 14:03:33 (149.167.136.111)
I used cheap modified ultrasonic supplies in my 6SK17-V / GK71 amp about 6 years ago but had to disassemble them when I moved to Australia. I am thinking of rebuilding them and would like to take the .......
9: Tube DIY Asylum, Mouser Australia (0.00)
Posted by RayP on 2022-09-19, 14:03:46 (149.167.136.111)
I've ordered a few times from Mouser Australia since we moved here two years ago. The order arrives a week later(from Hong Kong?) and shipping is free when the order is greater than A$60. Of course, t .......
10: High Efficiency Speaker Asylum, RE: Tannoy boxes are typically overrated.. imo. (0.00)
Posted by RayP on 2022-01-21, 13:36:54 (149.167.137.223)
When my father bought his 15"reds in the late 60's, he initially put them in a large open baffle where they sounded better than in the bass reflex cabinets he eventually built. Because I don't have th .......
11: Tube DIY Asylum, RE: "simple" (0.00)
Posted by RayP on 2021-09-23, 14:15:37 (149.167.148.235)
Good lord, it's my diagram. I found the circuit in an old Glass Audio years ago. I bet whoever first dreamed up this circuit was extremely proud of themself. I still use the dual switch arrangement fo .......
12: Tube DIY Asylum, Mouser (0.00)
Posted by RayP on 2021-03-12, 14:00:29 (149.167.148.183)
I see Mouser has free shipping on orders greater than 460 kr (50 euros). They have a good selection of transformers. ray .......
13: Tube DIY Asylum, RE: At the other end of the beauty stakes ......So how does it sound ? nt (0.00)
Posted by RayP on 2021-02-08, 20:21:14 (149.167.137.47)
The full writeup is at the link below. Towards the end I wrote: _ So the big question is whether you can actually hear differences between the various tubes. The answer is yes, which is not surprisin .......
14: Tube DIY Asylum, initial thoughts (0.00)
Posted by RayP on 2021-02-08, 16:43:55 (149.167.137.47)
My initial thoughts for one tube with two three-way switches per channel and a parafeed output. I've still got those 6900's you gave me way back when. All I have to do is find them. ray ::: TOPIC:: .......
15: Tube DIY Asylum, RE: At the other end of the beauty stakes (0.00)
Posted by RayP on 2021-02-07, 18:00:39 (149.167.137.47)
Now you've got me thinking. ray .......
16: Tube DIY Asylum, RE: After you put your eyes out changing tubes... (0.00)
Posted by RayP on 2021-02-07, 15:05:37 (149.167.137.47)
I redid the line-stage shortly after and omitted the corner poles and exposed innards. It was a glorified breadboard that was part of my learning experience. And I am still learning. ray .......
17: Tube DIY Asylum, At the other end of the beauty stakes (0.00)
Posted by RayP on 2021-02-07, 13:18:06 (149.167.137.47)
One of my first DIY projects was the Tube Taster where I created a line stage that could easily switch between several different tube types. The unit is designed to be turned over easily and wo .......
18: Tube DIY Asylum, RE: Question Re: Halogen Transformers for Heating (0.00)
Posted by RayP on 2021-02-07, 13:04:06 (149.167.137.47)
Alex's method also calls for a 270 / 330 uf capacitor to reduce a 200 hz hum. The capacitor also causes the output voltage to rise so removing or adding turns to the toroid is necessary to reach the d .......
19: Tube DIY Asylum, Tube number origins (0.00)
Posted by RayP on 2020-12-08, 11:40:49 (149.167.137.47)
I need a history lesson. How was the numbering system for tubes developed? For example, with a 6SN7 or 12SN7, the initial digits showed the heater voltage. But what about the SN7 combination? Why not .......
20: SET Asylum, Wattage table (0.00)
Posted by RayP on 2020-10-14, 16:32:06 (149.167.151.35)
Paul Joppa (of Bottlehead fame) has posted about this topic. Look at this link and go down to the third comment. To get to 102 dB, the table shows you would need 4 to 8 watts. For a speaker system lik .......
21: Tube DIY Asylum, heavy (0.00)
Posted by RayP on 2020-10-09, 14:16:49 (149.167.151.35)
Any guitar amp that Douglas builds would have to be heavier than the speaker and box. ray .......
22: SET Asylum, underneath (0.00)
Posted by RayP on 2020-09-27, 02:32:00 (149.167.151.35)
Thankyou. I always think the underside photos are much more interesting than the top. ray .......
23: SET Asylum, underneath photos (0.00)
Posted by RayP on 2020-09-26, 14:48:13 (149.167.151.35)
Could you post some photos of the guts? ray .......
24: Tube DIY Asylum, KT88 videos (0.00)
Posted by RayP on 2020-09-12, 16:18:53 (149.167.151.35)
There is an excellent series of videos on how to build an SE KT88 amp. It is very detailed and you should find them very instructive, particularly if you are building your first amp. Ten years ago, a .......
25: Tube DIY Asylum, ssg (0.00)
Posted by RayP on 2020-09-12, 16:01:22 (149.167.151.35)
The voltage limit for SSGs is 350v. KSG is 500v or higher. I suspect they will sound similar though I have not done a comparison. They are still relatively inexpensive so you can try them out without .......
26: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2020-09-11, 13:13:02 (149.167.151.35)
They do come in 0.1 uf and I am very happy with them. Yes, they are large but I typically use Goop to glue them into position. ray .......
27: SET Asylum, "Grainy" sound (0.00)
Posted by RayP on 2020-09-07, 13:23:06 (149.167.151.35)
The question remains. What causes the 'grainy sound'? ray .......
28: Tube DIY Asylum, I reckon he had more fun (0.00)
Posted by RayP on 2020-08-27, 15:12:31 (149.167.151.35)
I always looked forward to a Vinnie post just to see what he was up to next. He seemed to have more fun with his building than most of us and was not afraid to admit to his failed projects and ask que .......
29: SET Asylum, Good news (0.00)
Posted by RayP on 2020-05-29, 08:38:42 (73.172.72.229)
I am pleased to see that you got the problem fixed. Happy listening. ray .......
30: Tube DIY Asylum, simplest 5 vdc (0.00)
Posted by RayP on 2020-04-10, 11:55:16 (73.172.72.229)
There are 92 posts in this thread on Diy Audio. Some such as post 7 recommend inexpensive light weight SMPS units. There are concerns about whether the SMPS units can handle the current draw on cold t .......
31: SET Asylum, caps (0.00)
Posted by RayP on 2020-04-09, 04:54:11 (73.172.72.229)
I have been exchanging messages with Jack and he has sent me some photos. When the virus restrictions are over I will travel to his place to do some measurements. It has been interesting to look at wh .......
32: SET Asylum, issues (0.00)
Posted by RayP on 2020-04-05, 18:46:53 (73.172.72.229)
What issues are you having? As you know, John's amps were unique and so be careful about who you let work on it in case they want to 'improve' it. You may have to wait until the stay-at-home rules are .......
33: Tube DIY Asylum, Wire gauges (0.00)
Posted by RayP on 2020-02-29, 10:39:21 (73.172.72.229)
I suspect you are right. I also like to color code so I can pick out which wires are which. ray .......
34: Tube DIY Asylum, Wire gauges (0.00)
Posted by RayP on 2020-02-28, 05:44:37 (73.172.72.229)
Are there recommended wire gauges for the following with reasons why not higher or lower? signal high voltage heaters - low currents heaters - large currents ground wires I would like to restrict the .......
35: Tube DIY Asylum, PSUD for Macs (0.00)
Posted by RayP on 2020-02-24, 05:18:57 (73.172.72.229)
For those in the Apple world. ray .......
36: Tube DIY Asylum, RE: How many RC stages for B+ and cap size? (0.00)
Posted by RayP on 2020-02-02, 05:56:21 (73.172.72.229)
Read this. ray .......
37: Tube DIY Asylum, PSUD (0.00)
Posted by RayP on 2020-01-27, 04:43:48 (73.172.72.229)
Over on another forum, Duncan has posted that he is working on version 3 and also a Mac version (see posts 12 & 15). ray .......
38: Tube DIY Asylum, RE: so what am I doing wrong? (0.00)
Posted by RayP on 2020-01-27, 04:32:50 (73.172.72.229)
Right-click on the resistor section (not the resistor itself). You will see a popup where you can select resistive or constant current. Select constant current and then change the current to your d .......
39: Tube DIY Asylum, snipping tool (0.00)
Posted by RayP on 2020-01-26, 14:46:15 (73.172.72.229)
The snipping tool comes with Windows and is very helpful. ray .......
40: SET Asylum, schematics (0.00)
Posted by RayP on 2020-01-20, 05:45:31 (73.172.72.229)
Understood, ray .......
41: SET Asylum, schematics (0.00)
Posted by RayP on 2020-01-20, 05:11:26 (73.172.72.229)
I remember John's amps at the meets in Elkton MD. Did you ever come up with schematics of his amps? ray .......
42: Tube DIY Asylum, Wago (0.00)
Posted by RayP on 2020-01-16, 05:35:29 (73.172.72.229)
I would agree they are good for breadboarding which is mostly what I do these days. ray .......
43: Tube DIY Asylum, Waygo (0.00)
Posted by RayP on 2020-01-12, 04:52:51 (73.172.72.229)
I think I got the same package you are getting. Have fun. ray .......
44: Tube DIY Asylum, Wago (0.00)
Posted by RayP on 2020-01-11, 10:45:05 (73.172.72.229)
Thanks for the tip. So far I have just tugged on the wire to make sure I inserted it correctly. ray .......
45: Tube DIY Asylum, Not soldering - Waygo connectors (0.00)
Posted by RayP on 2020-01-11, 05:38:17 (73.172.72.229)
For most of last year, I have been fighting statin-induceed myopathy. It mostly affects the muscles in your legs and upper body but it also makes your hands shake which makes soldering difficult. I su .......
46: Tube DIY Asylum, artisan (0.00)
Posted by RayP on 2020-01-11, 04:56:19 (73.172.72.229)
Lovely work. Today my Mum would have turned 102 and it's also the 10th anniversary of my retirement. I still have a jumper she knit for me fifty years ago. It's beautiful. However, I think she would b .......
47: SET Asylum, cathode follower (0.00)
Posted by RayP on 2020-01-03, 14:28:47 (73.172.72.229)
I see from the manufacturer's website that the 300B is driven directly by a cathode follower so presumably the capacitor is between the input tube and the cathode follower. Do you have more details ab .......
48: Tube DIY Asylum, hash filter formula (0.00)
Posted by RayP on 2019-12-21, 04:51:20 (73.172.72.229)
Is there a formula where you came up with the 47 uh value? I presume it would depend on the RF frequency of the hash but how do you estimate that value? ray .......
49: Tube DIY Asylum, RE: volume knobs? where to buy (0.00)
Posted by RayP on 2019-08-31, 05:10:19 (73.172.72.229)
See link on ebay. ray .......
50: Tube DIY Asylum, daughters (0.00)
Posted by RayP on 2019-08-05, 05:06:10 (73.172.72.229)
About 15 years ago I bought the parts for the Poindexter PP 6V6 amp and gave them to my daughter to build. She inherited her mother's fine motor skills and her build was far better than anything I cou .......
51: Tube DIY Asylum, RE: the dcr of xformer sets the idle current..-nt (0.00)
Posted by RayP on 2019-07-30, 09:37:36 (73.172.72.229)
That makes sense. Thanks. ray .......
52: Tube DIY Asylum, RE: A new project for Vinnie (0.00)
Posted by RayP on 2019-07-30, 08:28:48 (73.172.72.229)
DIY Audio The link shows the discussion and somebody in post #56 breadboarded the amp with similar wimpy results to what you achieved. Post 62 also mentions another circuit with the OT as part of a ca .......
53: Tube DIY Asylum, A new project for Vinnie (0.00)
Posted by RayP on 2019-07-28, 07:11:56 (73.172.72.229)
On another forum I have been watching a thread about a direct coupled SE cathode follower 6SJ7 / 6V6 amp. The original arcticle estimated 4.5 watts output but most agree a half watt is the probable ou .......
54: Tube DIY Asylum, the dumb question (0.00)
Posted by RayP on 2019-07-28, 06:56:38 (73.172.72.229)
Years ago when I was working, I used to admire a peer who was not afraid to ask the 'dumb question' that her peers were too afraid to ask in case they looked dumb. I still try to follow her example be .......
55: Tube DIY Asylum, RE: Amazon prime (0.00)
Posted by RayP on 2019-07-19, 09:03:20 (73.172.72.229)
$119 but read the link below. I had not known about the discounts. Whether the service works for you may depend on your location and ability to get around. I live 11 miles from the closest supermarket .......
56: Tube DIY Asylum, Amazon prime (0.00)
Posted by RayP on 2019-07-19, 05:18:27 (73.172.72.229)
It can be worthwhile checking on Amazon. Many items are available with fast free shipping if you are signed up with Prime. Yes, most of the brands are unknown but there are some famous names. ray ::: .......
57: Tube DIY Asylum, RE: 26 v 76 (0.00)
Posted by RayP on 2019-06-20, 05:10:38 (73.172.72.229)
Thanks Paul. That was very useful. ray .......
58: Tube DIY Asylum, 26 v 76 (0.00)
Posted by RayP on 2019-06-19, 16:59:01 (73.172.72.229)
Thanks for the links. The point of Paul's articles deals more with the linearity of the tube and I can understand why that is important. However, let's compare a 26 against a 76 or 6SN7. While Paul's .......
59: Tube DIY Asylum, RE: DHT versus IHT (0.00)
Posted by RayP on 2019-06-19, 06:40:37 (73.172.72.229)
Thanks for the suggestions. I have some of the Valve issues but no those. Do they just cover the SE topology in general, or do they cover the difference between DHT and IHT? ray .......
60: Tube DIY Asylum, Coefficient of resistance (0.00)
Posted by RayP on 2019-06-18, 10:32:57 (73.172.72.229)
The number of responses has been limited so far and with some trepidation, I put forward the following idea which is that the DHT sound is an additive like salt is to cooking. When I first started bui .......
61: Tube DIY Asylum, DHT versus IHT (0.00)
Posted by RayP on 2019-06-17, 15:57:05 (73.172.72.229)
I suspect many of us would agree that DHT sounds different from IHT. Is there a reason why we hear this and is there a physical reason that causes it? ray .......
62: Tube DIY Asylum, RE: John Hogan amps (0.00)
Posted by RayP on 2019-06-14, 13:55:36 (73.172.72.229)
I have added in your description. We had a great time, didn't we? ray .......
63: Tube DIY Asylum, RE: John Hogan amps (0.00)
Posted by RayP on 2019-06-14, 12:12:07 (73.172.72.229)
I have included a link to a meet similar to the one where John turned up with his amps. We had no idea who he was. He just added his amps to the mix and they impressed. As usual, we listened to a bunc .......
64: Tube DIY Asylum, John Hogan amps (0.00)
Posted by RayP on 2019-06-13, 04:40:36 (73.172.72.229)
Since his name popped up in the KT88 discussion, I thought I would post a link in the SET asylum from shortly after John's death. What first amazed me about his builds was the way he covered up the ho .......
65: SET Asylum, give them away? (0.00)
Posted by RayP on 2019-05-02, 17:28:54 (73.172.72.229)
The question is whether you need the money or should you simply give them to somebody younger who you think would be worthy of owning them. You would have the satisfaction of knowing that they will pr .......
66: SET Asylum, RE: Looking for a 10v x 5.0A DC supply (0.00)
Posted by RayP on 2019-04-28, 05:15:57 (73.172.72.229)
Take a look at the high-frequency AC solution here. ray .......
67: SET Asylum, DC link caps (0.00)
Posted by RayP on 2019-04-13, 15:53:26 (73.172.72.229)
You might find these useful if space is a problem. ray .......
68: Tube DIY Asylum, cheaper (0.00)
Posted by RayP on 2019-02-25, 16:43:38 (73.172.72.229)
If you have the room, these would be cheaper. ray .......
69: Tube DIY Asylum, powerdrive (0.00)
Posted by RayP on 2019-02-11, 17:09:49 (73.172.72.229)
Since you expressed interest in the Tubelab site, you might like to investigate Powerdrive which is relatively easy to implement and would fit in better with your lowish B+. You might remember my GK-7 .......
70: Tube DIY Asylum, Bottlenecks (0.00)
Posted by RayP on 2019-02-04, 06:46:16 (73.172.72.229)
Shortly after the turn of the century, Doug Piccard and I started to hold occasional meetings in a meeting room at the local library in Elkton, MD. They were very successful and sometimes we got about .......
71: Tube DIY Asylum, a bit more detail? (0.00)
Posted by RayP on 2019-01-24, 10:22:16 (73.172.72.229)
Perhaps even a schematic? Beautiful work by the way. ray .......
72: Tube DIY Asylum, schematic (0.00)
Posted by RayP on 2019-01-13, 11:26:32 (73.172.72.229)
The schematic is shown here. ray .......
73: Tube DIY Asylum, RE: RE SMPS (0.00)
Posted by RayP on 2018-11-20, 14:36:30 (73.172.72.229)
For a phono stage, TK's solution might be more compact and simple to build, depending on the voltage and current you need. In my case, weight was my driving consideration. And of course, just to try s .......
74: Tube DIY Asylum, RE SMPS (0.00)
Posted by RayP on 2018-11-20, 08:32:02 (73.172.72.229)
Somehow the subject line changed of its own accord. Urangan is a seaside resort in Queensland, Australia, and I am planning to move there next year. One advantage of these SMPS units is that the .......
75: Tube DIY Asylum, RE: Urangan (0.00)
Posted by RayP on 2018-11-20, 06:52:28 (73.172.72.229)
I've been playing around with this for a couple of years now as part of my 'reduce the weight' campaign. See the link below. 48 volt units are quite cheap at All Electronics. https://www.allelec .......
76: Tube DIY Asylum, Round (0.00)
Posted by RayP on 2018-11-17, 06:04:39 (73.172.72.229)
I wonder why none of the manufactures make a version that would fit in a round hole and cover any gaps. Presumably it would be a bit larger, but not all that much. Perhaps there is a rule about the sh .......
77: Tube DIY Asylum, RE: Plate load resistors and B+ voltage (0.00)
Posted by RayP on 2018-11-04, 05:37:21 (73.172.72.229)
Eli is correct of course, but you could put a 1 meg resistor in parallel with the 20K resistor and get 19608. I wouldn't bother. ray .......
78: Tube DIY Asylum, RE: The potential problem with that (0.00)
Posted by RayP on 2018-10-07, 07:42:06 (73.172.72.229)
Then the PEC brand seems not to have a narrow enough tolerance to satisfy the requirements. The remaining five could possibly have varying torques. You would need to order more than 6 and then measure .......
79: Tube DIY Asylum, buy just 1 of each (0.00)
Posted by RayP on 2018-10-07, 05:28:10 (73.172.72.229)
You will waste some money including the shipping cost but then you will be able to make an informed decision when you buy the other 5. ray .......
80: Tube DIY Asylum, IBM type 1 (0.00)
Posted by RayP on 2018-09-26, 17:57:27 (73.172.72.229)
IBM type 1 is shielded (foil and mesh) with solid copper of 22 awg. I use it a lot and it is quality stuff. ray .......
81: High Efficiency Speaker Asylum, RE: Beaming (0.00)
Posted by RayP on 2018-09-04, 20:24:24 (1.128.104.232)
Thanks for all the interesting answers. It's what I like about these forums. So many people know so many things that I don't know and are willing to share. ray .......
82: High Efficiency Speaker Asylum, Beaming (0.00)
Posted by RayP on 2018-09-02, 14:37:35 (1.128.105.61)
From what I have read, beaming is an undesirable attribute. However, 99.999% of the time I am listening by myself in the same chair and in the same place in the room. Provided I like what I am hearing .......
83: Tube DIY Asylum, possible congestion (0.00)
Posted by RayP on 2018-08-04, 14:45:36 (120.154.60.211)
The internet is a shared environment and there are many possible points of congestion between your computer and the server which hosts the asylum. In addition, your 9 pm may be 6 pm elsewhere or 11 am .......
84: Tube DIY Asylum, Weight (0.00)
Posted by RayP on 2018-07-16, 04:33:03 (73.172.72.229)
It's an interesting exercise to build a light weight DHT amp. You might like to read about my version that I designed lying on a hospital bed in the ICU after my bypass operation. I tried to make ever .......
85: Tube DIY Asylum, doing something different (0.00)
Posted by RayP on 2018-07-15, 11:09:59 (73.172.72.229)
We all tend to get into a rut and I find it's sometimes a good idea to try something quite different from what has worked for me in the past. The results may not always please me, but I learn somethin .......
86: Tube DIY Asylum, boredom (0.00)
Posted by RayP on 2018-07-14, 13:20:49 (73.172.72.229)
I've been thru periods where I don't have the enthusiasm to build or even plan to build, usually during the summer. I would rather do different things. However, eventually something piques my interest .......
87: Tube DIY Asylum, 833a (0.00)
Posted by RayP on 2018-07-14, 05:34:04 (73.172.72.229)
That thing scares me. Oddly enough, I have never built a 45, 2A3 or 300B amp. Perhaps I should join the 'normal' world and do it one day. I could build the bullet proof design that Paul J came up with .......
88: Tube DIY Asylum, 211 (0.00)
Posted by RayP on 2018-07-14, 05:23:59 (73.172.72.229)
I was interested to see that the WE 10-A ran the 211 tubes at 'just' 750 volts. That is about my limit for how high I would be prepared to go. I do like the look of these tubes. ray .......
89: Tube DIY Asylum, visual (0.00)
Posted by RayP on 2018-07-14, 05:11:03 (73.172.72.229)
Since I am scared of high voltages, this tube is not for me. If I had to use it, I think I would build a low powered amp and just add a 304TL for a visual effect. Connect the filament and not the plat .......
90: Tube DIY Asylum, WE 9-A (0.00)
Posted by RayP on 2018-07-14, 04:59:10 (73.172.72.229)
I know what you mean about heat sinks. I'm also currently building a Mofo. However since I have some 4P1L I might try them in a WE 9-A layout. It might be fun to do the filaments with lithium ion bat .......
91: Tube DIY Asylum, boat anchors (0.00)
Posted by RayP on 2018-07-14, 04:47:30 (73.172.72.229)
Hi Douglas, It's always interesting to see what you are getting up to. I'm trying to build light weight amps these days so boat anchors are out of the question, but I love seeing and hearing them in a .......
92: Tube DIY Asylum, What amplifier would you like to build? (0.00)
Posted by RayP on 2018-07-13, 16:24:27 (73.172.72.229)
I found the 100 power amplifiers site very interesting. It made me think that to a certain extent I am stuck in a rut and I should play with some other topology / tube / power supply / beauty of build .......
93: Tube DIY Asylum, another source of AB (0.00)
Posted by RayP on 2018-07-09, 05:52:23 (73.172.72.229)
While browsing I found this place in Ohio that appears to be a regular surplus store. Prices seem reasonable, especially for the lower wattage resistors. By the way, is there any real advantage in usi .......
94: Tube DIY Asylum, That is only half of it (0.00)
Posted by RayP on 2018-07-01, 04:27:00 (73.172.72.229)
There is another box as well linked by an umbilical. Check out the purple prose in the review below. Apparently you can also get a phono stage stuck in there as well and it becomes a Chenin. Personall .......
95: Tube DIY Asylum, Nuts on the pots (0.00)
Posted by RayP on 2018-06-21, 05:00:57 (73.172.72.229)
I realize that they won't be visible, but could you adjust the nuts on the pots so that they are perfectly aligned. I will sleep better at night. Years ago I had a holiday on a canal boat in England f .......
96: Tube DIY Asylum, Mouser (0.00)
Posted by RayP on 2018-06-05, 05:27:48 (73.172.72.229)
They appear to be a new line at Mouser, presuming that Vishay did not change anything in the construction. ray .......
97: Tube DIY Asylum, RE: the results are in...... (0.00)
Posted by RayP on 2018-05-29, 17:06:31 (73.172.72.229)
Your results appear to be similar to mine. At least the measurement gives you a rough idea. Have you tried lower value inductors? ray .......
98: Tube DIY Asylum, some readings from a cheap meter (0.00)
Posted by RayP on 2018-05-28, 17:17:04 (73.172.72.229)
I actually bought a cheap lcr meter last year. It appears to be the same as the model listed below though it only cost me $10 with free shipping. To be honest, I can't remember why I bought it but pre .......
99: Tube DIY Asylum, RE: 30 uF caps (0.00)
Posted by RayP on 2018-04-22, 18:44:02 (73.172.72.229)
I'll probably use these. I've used motor runs a lot in the past and I mount them with Goop. ray .......
100: Tube DIY Asylum, RE: Heat sink room for the 7812 regulator (0.00)
Posted by RayP on 2018-04-22, 18:40:01 (73.172.72.229)
Thanks for the advice. ray .......
101: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-22, 11:24:33 (73.172.72.229)
I understand what you mean. I was just curious if I could fit it all in. By the way, I ordered some 6N2Ps so it looks like I will go ahead. I already have just about everything else I need except the .......
102: Tube DIY Asylum, version 6 (0.00)
Posted by RayP on 2018-04-22, 06:21:01 (73.172.72.229)
I've managed to squeeze both circuit and power supply on to one board. I have included a couple of pads between the 100 uf cap and the 0.0033 uf cap so that there is the option of using just one se .......
103: Tube DIY Asylum, RE: version 5 (0.00)
Posted by RayP on 2018-04-21, 09:12:13 (73.172.72.229)
I have moved the power supply to a different board. I crammed both circuit and power supply into version 1 but it was quite messy. Perhaps I could try again sometime as I get more practice. I'm try to .......
104: Tube DIY Asylum, RE: version 5 (0.00)
Posted by RayP on 2018-04-20, 12:44:50 (73.172.72.229)
Thanks for the tip. I was also considering doing just what you suggested. ray .......
105: Tube DIY Asylum, RE: version 5 - ps (0.00)
Posted by RayP on 2018-04-20, 12:42:55 (73.172.72.229)
My daughter in Sydney will need a phono stage so there is my excuse to build it. I did a bit of work on a separate power supply PCB. Ugly, but it is version 1. I am tempted to use a proper inductor .......
106: Tube DIY Asylum, version 5 (0.00)
Posted by RayP on 2018-04-20, 06:48:42 (73.172.72.229)
I think I have learned a lot and thanks for the suggestions. I fixed a few errors in version 4 and made some of the suggested adjustments. I've been pondering the large 30 uf caps and I see no alte .......
107: Tube DIY Asylum, version 4 (0.00)
Posted by RayP on 2018-04-18, 18:50:31 (73.172.72.229)
First, thanks for all the suggestions and I have tried to incorporate some of them in the latest version. It appears to me that I might make better progress if I disregard the power supply and the .......
108: Tube DIY Asylum, RE: a question about the LR8N3 (0.00)
Posted by RayP on 2018-04-18, 09:18:01 (73.172.72.229)
Thank you. ray .......
109: Tube DIY Asylum, version 3 (0.00)
Posted by RayP on 2018-04-17, 06:37:51 (73.172.72.229)
I've incorporated some of the suggested changes and thanks to all who have helped. I will stop now and move onto something else. I do have one question about grounding.I managed to find a direct ro .......
110: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-16, 14:52:54 (73.172.72.229)
No problem. It all gets so confusing at times, particularly where I have tried to put a quart into a pint pot. At least I am learning some better techniques as I proceed. ray .......
111: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-16, 13:37:20 (73.172.72.229)
I will correct the spelling and apologies to Eli. I usually put the 47K resistor at the RCA socket itself but it probably would be a good idea to give the option to have it on the board. By decouplin .......
112: Tube DIY Asylum, PCB of Eli's phono stage - version 2 (0.00)
Posted by RayP on 2018-04-16, 07:37:49 (73.172.72.229)
Here is version 2 and I think it is better than version 1. The grounding scheme is not a star but more of the bus topology. The quadrant layout worked better for me, so that is a lesson learned. La .......
113: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-16, 06:02:04 (73.172.72.229)
Thanks Eli. As I mentioned, I am doing this as a learning experience in designing PCBs. I used your version of the RCA circuit because it had recently been a topic of discussion and looked more compli .......
114: Tube DIY Asylum, a question about the LR8N3 (0.00)
Posted by RayP on 2018-04-15, 11:39:46 (73.172.72.229)
My eyes are having trouble reading the blurb at the bottom of the power supply section. I think it says R2 / R1 = 207 R2 = 470K R1 = 2.3K 3/4 watt trimpot 5K initially set to 2.3 K Is the trimpot in .......
115: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-15, 10:02:06 (73.172.72.229)
Thanks for the ideas. I usually put the 47k resistor at the RCA plug so that is why I did not include it in the PCB. I'm doing a new version using TKs suggestion of a star ground. I have divided the b .......
116: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-15, 08:16:49 (73.172.72.229)
Thanks for the star ground idea etc. I'll have another go at the design and try to incorporate it. I've found a couple more errors which I find very satisfying. My brain must still be in working order .......
117: Tube DIY Asylum, PCB creation (0.00)
Posted by RayP on 2018-04-15, 06:30:26 (73.172.72.229)
I tried a few different layout programs and found PCB Express worked better for me. To create the gerbers I found used a service on www.fiverr.com that converts PCB Express files to Gerbers. I used si .......
118: Tube DIY Asylum, RE: A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-15, 05:54:20 (73.172.72.229)
I am feeling fine. I have been travelling a lot and soon will be off to Norway / Poland. Retirement is wonderful. The building process is a slow motion affair for me so I will wait for a while before .......
119: Tube DIY Asylum, A PCB of Eli's phono stage (0.00)
Posted by RayP on 2018-04-14, 18:36:11 (73.172.72.229)
I haven't been in the mood for building for a while, but I have become increasingly interested in playing around with PCB Express. I've done a couple of simple designs but wondered about doing some .......
120: Tube DIY Asylum, Sakuma crossover (0.00)
Posted by RayP on 2018-02-04, 07:34:37 (73.172.72.229)
Vinnie's search for a pp 45 inspired me to poke around on the net and I came across a site devoted to Sakuma amps. One of the interesting pages shows a schematic for implementing a crossover within th .......
121: SET Asylum, RE: Urangan (0.00)
Posted by RayP on 2018-01-29, 13:11:45 (73.172.72.229)
By the way, I hope you have seen some soldier crabs. You can often see them in the late afternoon at low tide south of the jetty. Out of curiosity, how did you hear about Hervey Bay? ray .......
122: SET Asylum, Urangan (0.00)
Posted by RayP on 2018-01-29, 05:54:54 (73.172.72.229)
Hope you are enjoying the jetty. One of my favourite places on earth and virtually unknown in Oz. ray .......
123: Tube DIY Asylum, dc link (0.00)
Posted by RayP on 2018-01-26, 11:16:35 (73.172.72.229)
I would disconnect the can caps and leave them for show. Then use two 50 uf 700 vdc DC Link caps. Of course you would need to have the room. ray .......
124: Tube DIY Asylum, gummy bear (0.00)
Posted by RayP on 2018-01-12, 10:56:51 (73.172.72.229)
Well that is your solution! Gummy bears. And then we could start a discussion about which colors sound best. ray .......
125: Tube DIY Asylum, a bit higher. (0.00)
Posted by RayP on 2018-01-11, 12:19:51 (73.172.72.229)
Again the readings vary a bit but after another half hour the top is 130 F so I suspect you are good to go. ray .......
126: Tube DIY Asylum, RE: More detail... (0.00)
Posted by RayP on 2018-01-11, 11:50:39 (73.172.72.229)
I've placed a small piece of 1/8 aluminium angle (2" x 1" x 1") next to the tube with the two sides less than a 1/16" from the tube, but not touching. After about 45 minutes, I am still getting readin .......
127: Tube DIY Asylum, RE: Bulb Temperature (0.00)
Posted by RayP on 2018-01-11, 11:13:10 (73.172.72.229)
Another way might be to place a piece of metal next to the side of the tube and measure it after it warms up. I'll give it a go. ray .......
128: Tube DIY Asylum, RE: SE EL156 amp (0.00)
Posted by RayP on 2018-01-11, 11:05:41 (73.172.72.229)
Possibly DC Link capacitors. See link. Mouser normally carries Vishay and Wima versions that cost about $20 - 25 each. The size is much less than motor run caps. ray .......
129: Tube DIY Asylum, RE: Bulb Temperature (0.00)
Posted by RayP on 2018-01-11, 10:57:21 (73.172.72.229)
I just measured a couple of 6C45Pi tubes that are running at about 110 volts 18 ma for 2 watt approx. Heater is supposed to be 440 ma at 6.3 volts for 2.7 watts. Total of 4.7 watts would be in your ra .......
130: Tube DIY Asylum, RE: monoblocks (0.00)
Posted by RayP on 2017-12-20, 16:57:19 (73.172.72.229)
I remember the two of us carrying in your monoblocks one by one years ago. How you ever got them in your truck by yourself was a mystery to me. ray .......
131: Tube DIY Asylum, lightspeed (0.00)
Posted by RayP on 2017-12-20, 11:13:06 (73.172.72.229)
For a volume control, you might like to investigate the Lightspeed solution using LDRs. I have not tried it, but I heard one years ago and was impressed. Kits are available. I personally don't bother .......
132: Tube DIY Asylum, monoblocks (0.00)
Posted by RayP on 2017-12-19, 18:05:44 (73.172.72.229)
Another thing to consider. Some builders prefer them, but I suspect weight is part of the issue. ray .......
133: SET Asylum, children (0.00)
Posted by RayP on 2017-12-16, 05:24:46 (73.172.72.229)
Years ago I was pleasantly surprised when my daughter asked if she could play a few CDs on my system so that she could hear what they really sounded like. She was duly impressed but I suspect the real .......
134: High Efficiency Speaker Asylum, RE: open baffle - a bit more (0.00)
Posted by RayP on 2017-12-09, 14:22:37 (24.126.111.247)
I had been playing around with various smaller drivers in a JE Labs style open baffle (see link below) with a Goldwood 18" 1858 (qts 1.1) handling the low bass. On a whim I decided to try the Tanno .......
135: High Efficiency Speaker Asylum, open baffle (0.00)
Posted by RayP on 2017-12-09, 06:02:02 (24.126.111.247)
I suspect you are really anxious to cut wood but before you do, try the Tannoys in an open baffle. I inherited my father's 15" reds about 20 years ago but had no room to build any of the usual larger .......
136: SET Asylum, some other thoughts (0.00)
Posted by RayP on 2017-11-27, 19:02:22 (24.126.111.247)
There are plenty of designs out there that you can copy or can give you ideas. Here are some points to consider when you look at the alternatives. What power output do you want? What operating voltage .......
137: Tube DIY Asylum, air coil inductor (0.00)
Posted by RayP on 2017-11-08, 12:14:05 (24.126.111.247)
Does this imply that an air coil inductor in series with a typical plate choke would be an improvement? Slightly higher overall inductance but less overall capacitance. ray .......
138: Tube DIY Asylum, RE: Powerdrive (0.00)
Posted by RayP on 2017-09-12, 12:22:28 (24.126.111.247)
The added complexity is probably not worth while for the tubes you mentioned. However it is a way to achieve fixed bias and A2 if you want to. ray .......
139: Tube DIY Asylum, RE: Powerdrive (0.00)
Posted by RayP on 2017-09-12, 05:30:55 (24.126.111.247)
Although I am not familiar with the tube, I read that it is a high mu and very linear tube when triode connected. The powerdrive recipe calls for a high mu tube so it will work. A lot will depend on y .......
140: Tube DIY Asylum, Powerdrive (0.00)
Posted by RayP on 2017-09-11, 16:22:15 (24.126.111.247)
I've used this a few times and it works well, particularly for hard to drive tubes such as transmitting tubes. You can substitute a 2SK3564 for the 2SK2700. ray .......
141: High Efficiency Speaker Asylum, two versions (0.00)
Posted by RayP on 2017-09-10, 05:28:20 (24.126.111.247)
The trick is to build a sacrificial version that is much larger than what you really need. After the complaints start, then replace the large monster with whatever you really wanted to build. It will .......
142: Tube DIY Asylum, lead inductance (0.00)
Posted by RayP on 2017-07-20, 18:36:07 (24.126.111.247)
Not being familiar with this term, I looked it up and it made me wonder if lead inductance might be desirable in AF circuits where presumably we don't hear above 20 khz, or far less for many of us. Wh .......
143: Tube DIY Asylum, RE: browser switcher (0.00)
Posted by RayP on 2017-07-14, 13:58:09 (24.126.111.247)
And just to emphasize with you, here is my latest building adventure. I am going to try to build this Nelson Pass design. Somehow even after measuring twice and drilling three times, I was still s .......
144: Tube DIY Asylum, browser switcher (0.00)
Posted by RayP on 2017-07-14, 13:14:49 (24.126.111.247)
I installed this special switcher in my browser to test whether I can immediately tell if my spelling is correct or incorrect. Even with a calcifying brain, it appears that I can still tell the differ .......
145: Tube DIY Asylum, the aura (0.00)
Posted by RayP on 2017-07-14, 07:41:28 (24.126.111.247)
Yes. Somehow it works for me. Perhaps you are like my wife and you don't have the 'aura'. It really annoys her when something on her PC is not working and I come and do exactly what she was doing and .......
146: Tube DIY Asylum, RE: Is spell checker working? (0.00)
Posted by RayP on 2017-07-14, 06:28:56 (24.126.111.247)
Spell checking works for me. It's a setting in your browser. In Chrome it is in the Advanced section of Settings. ray .......
147: Tube DIY Asylum, less than wonderful amps (0.00)
Posted by RayP on 2017-07-09, 10:36:51 (24.126.111.247)
Does this mean that if you can't tell the difference between two or more amps then they are perfect? If that is so, then I enjoy the imperfections of my less than wonderful amps. They are what makes t .......
148: Tube DIY Asylum, RE: tube taster (0.00)
Posted by RayP on 2017-07-09, 06:39:52 (24.126.111.247)
The chain at the time was CD source > tube taster line stage > amplifier > loudspeakers. Only the high voltage of the line stage was turned off momentarily as I switched between tubes and then high vo .......
149: Tube DIY Asylum, RE: tube taster (0.00)
Posted by RayP on 2017-07-09, 06:20:18 (24.126.111.247)
We all different and we have to respect and appreciate those differences. ray .......
150: Tube DIY Asylum, tube taster (0.00)
Posted by RayP on 2017-07-09, 04:21:17 (24.126.111.247)
I posted this link about the multi-type tube line stage a while ago but I think it is still relevant. The switch arrangement satisfies most of your requirements except for volume. All of the tubes are .......
151: SET Asylum, Looking inside (0.00)
Posted by RayP on 2017-06-26, 09:03:03 (92.26.212.216)
Out of curiosity I looked at some of the photos of the undersides of these Douk amps and I am intrigued. Instead of looking at the 300B amp, maybe the much less expensive EL34 amp might be a possibili .......
152: Tube DIY Asylum, pin layouts (0.00)
Posted by RayP on 2017-06-21, 13:40:32 (92.26.211.159)
Since I have been known to make mistakes, is it possible that you have the pin layouts to the 12AT7 wrong since they are different from the 6N1P? Perhaps a closeup photo might help. ray .......
153: Tube DIY Asylum, fast switching (0.00)
Posted by RayP on 2017-06-07, 00:40:09 (92.26.213.59)
One of my earliest projects was a 'taste tester' line stage where I could quickly switch between various tube types. It was an interesting project and the details are in the link. However the results .......
154: Tube DIY Asylum, RE: Why is inverting or non-inverting important? (0.00)
Posted by RayP on 2017-06-06, 12:44:04 (92.26.213.59)
Yes that is my understanding too. I can remember reading about the 'wood effect' years ago but I suspect many of us have no idea if our systems are inverting or not. Or the recording we are listening .......
155: Tube DIY Asylum, Why is inverting or non-inverting important? (0.00)
Posted by RayP on 2017-06-06, 12:03:34 (92.26.213.59)
Looking at deathtubes's post below, I realized that I really don't understand why the inverting issue is important. Perhaps somebody could enlighten me. ray .......
156: Tube DIY Asylum, RE: Blue ribbon to Ray P (0.00)
Posted by RayP on 2017-06-04, 04:18:19 (92.26.213.59)
I adore tacky, preferably really ugly, so you can see where I come from. ray .......
157: Tube DIY Asylum, RE: Blue ribbon to Ray P (0.00)
Posted by RayP on 2017-06-04, 00:07:49 (92.26.213.59)
If you have enough washers, you could just double up and be 1/8" thick. Thanks for the compliment but we all are the beneficiary of useful ideas on this forum. ray .......
158: Tube DIY Asylum, RE: I agree making some vents might solve your problem. (0.00)
Posted by RayP on 2017-06-03, 00:28:46 (92.26.213.59)
When I build amps these days I raise the top plate off the side panels with a washer at each screw, enough for air to escape. It's a bit hard to tell from your photo, but you might be able to raise yo .......
159: Tube DIY Asylum, caps on AC switchers (0.00)
Posted by RayP on 2017-06-01, 12:59:10 (92.26.213.59)
Comparing your photos in you first post and the photos after you messed with the amp, it appears that the two on the left side are now dimmer than in the first post. Check that the caps for the AC swi .......
160: Tube DIY Asylum, dc filament heating (0.00)
Posted by RayP on 2017-05-31, 12:25:29 (92.26.213.59)
When I look closely at the photo, it looks like you are using the high frequency AC units on the 813s. Of course, I am probably mistaken. ray .......
161: Tube DIY Asylum, voltage drop (0.00)
Posted by RayP on 2017-05-31, 07:51:55 (92.26.213.59)
Well done Vinnie! However I do have a question about the voltage drop from 475 to 350 through the FS030. It does seem to be too much. How much current are you passing through the transformer? ray ::: .......
162: Tube DIY Asylum, photo (0.00)
Posted by RayP on 2017-05-28, 12:35:21 (24.126.111.247)
It's usually helpful to take a few photos at different angles. Documentary evidence can be very useful a few years down the pike. The problem is finding those photos years later. ray .......
163: Tube DIY Asylum, holes in top plate (0.00)
Posted by RayP on 2017-05-13, 05:23:50 (24.126.111.247)
Since heat rises it would help to have some way for some of the heat to escape through the top plate. It looks like there are two holes towards the sides that have a screw or bolt that are not really .......
164: Tube DIY Asylum, current limiter circuit (0.00)
Posted by RayP on 2017-05-10, 11:42:37 (24.126.111.247)
This looks interesting. No, I have not tried it. ray .......
165: SET Asylum, test how much voltage power do you need (0.00)
Posted by RayP on 2017-05-08, 13:11:32 (24.126.111.247)
You might find doing the following test useful to estimate how much power you really need for your room, your speakers and how loud you like to listen. ray .......
166: Tube DIY Asylum, Goop (0.00)
Posted by RayP on 2017-04-22, 08:17:12 (24.126.111.247)
If you are not using a pcb, then Goop works well and I have used it to suspend motor run caps. Once I apply the glue and position the cap I rest something heavy on top like a hammer and wait about 12 .......
167: Tube DIY Asylum, is a film cap already multiple capacitors in parallel (0.00)
Posted by RayP on 2017-04-12, 16:45:24 (24.126.111.247)
I was looking at the Wikipedia article on film caps and it states - 'A key advantage of modern film capacitor internal construction is direct contact to the electrodes on both ends of the winding. Thi .......
168: Tube DIY Asylum, RE: Here ya go...... (0.00)
Posted by RayP on 2017-03-13, 06:31:18 (24.126.111.247)
OK if I get my wife's approval I shall try it and report back. Just fired up my system playing Kovacevich's version of Beethoven's Bagatelle. I think I am going to enjoy today's listening. ray ::: TO .......
169: Tube DIY Asylum, RE: O/T Squirrel proof bird feeder (0.00)
Posted by RayP on 2017-03-13, 02:54:21 (24.126.111.247)
The blog starts below. I'm still finishing it. ray .......
170: Tube DIY Asylum, O/T Squirrel proof bird feeder (0.00)
Posted by RayP on 2017-03-12, 06:15:09 (24.126.111.247)
About a month ago one of the threads branched off into a discussion about birdfeeders and now I am back from India, it's time for Vinnie to reveal all. It could be a fun discussion. As a side note, In .......
171: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-13, 10:24:36 (24.126.111.247)
Now that would be very interesting. Does it involve zapping them with high frequency AC? ray .......
172: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-13, 07:12:00 (24.126.111.247)
My experience is that every country has something different and interesting. And of course, 90% of the people I meet are very helpful and friendly, especially when I smile. ray .......
173: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-13, 05:14:10 (24.126.111.247)
I have been retired for 7 years and each year in addition to other travels, I go off by myself for some sort of trip, usually for a few weeks. My wife enjoys the period home alone, particularly the qu .......
174: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-12, 18:25:20 (24.126.111.247)
I am off to India for three weeks, but I think I can do this when I come back using my old Tubetaster line stage if I modify it a little. It is a work of art and a joy forever. ray .......
175: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-12, 15:53:54 (24.126.111.247)
It would be interesting to try all three approaches and see what you prefer when you listen. I'll have to try it sometime next month when I am back in town. DC AC 60 Hz AC whatever MHz ray ::: TOPIC:: .......
176: Tube DIY Asylum, RE: Halogen Lighting Transformer w/ Rectifier & Filter? (0.00)
Posted by RayP on 2017-02-12, 12:23:08 (24.126.111.247)
Since they are indirectly heated tubes, why do you want DC? I know that some prefer to feed such tubes with DC but I wonder why you would do that when using high frequency AC. And no, I have not tried .......
177: Tube DIY Asylum, RE: update (0.00)
Posted by RayP on 2017-02-08, 18:34:18 (24.126.111.247)
If you measure the resistance between the diodes at the edges of the pcb, the resistance should be zero if your's are like mine. So you can connect to either. ray .......
178: Tube DIY Asylum, RE: update (0.00)
Posted by RayP on 2017-02-08, 17:03:11 (24.126.111.247)
I think if you look at the back of the pcb that you will see that the diodes on either side are connected to each other at the edge of the pcb. they are also connected to the large green caps. It is j .......
179: Tube DIY Asylum, thermistor (0.00)
Posted by RayP on 2017-02-08, 11:24:13 (24.126.111.247)
http://www.mouser.com/Circuit-Protection/Thermistors/_/N-axfus?Keyword=CL-190&FS=True An inrush current limiter. More about them in the link below. They are often used when using toroid power transfor .......
180: Tube DIY Asylum, true rms meter (0.00)
Posted by RayP on 2017-02-08, 09:42:10 (24.126.111.247)
Are you measuring with a true RMS meter? I seem to remember you had one. I did my initial testing with a large power resistor. I also used a thermistor and not a variac. ray .......
181: Tube DIY Asylum, YMMV (0.00)
Posted by RayP on 2017-01-29, 05:14:15 (24.126.111.247)
I suppose that is why we use this acronym a lot in our hobby. Clearly your hearing abilities are different from mine. I just checked and at age 69 I can hear up to 13 khz and that is it. Back when I w .......
182: Tube DIY Asylum, RE: toroids (0.00)
Posted by RayP on 2017-01-22, 16:27:33 (24.126.111.247)
I don't have line transformers with that designation. Why do you want them? ray .......
183: Tube DIY Asylum, RE: toroids (0.00)
Posted by RayP on 2017-01-22, 08:42:28 (24.126.111.247)
That's an interesting idea. By the way, do you have any more info on the type of core material in the newer toroids. Is Antek using this? ray .......
184: Tube DIY Asylum, RE: toroids (0.00)
Posted by RayP on 2017-01-22, 08:10:51 (24.126.111.247)
Could you provide a diagram of how you wire the toroid as a common mode choke in your B+. I presume this is your plate choke. Could you also give an example of a newer design that can handle DC. My ex .......
185: Tube DIY Asylum, toroids (0.00)
Posted by RayP on 2017-01-22, 05:10:22 (24.126.111.247)
Another way is to use toroids that are normally used as power transformers. They are quite cheap from Antek. Once you work out your load, use the following equation to determine the one you require. F .......
186: Tube DIY Asylum, try a blog (0.00)
Posted by RayP on 2017-01-21, 05:04:49 (24.126.111.247)
I prefer to use a blog and post a link. It puts everything in one place and makes it easier to do a construction narrative and why you made certain choices. Below is a link to one of my early attempts .......
187: Tube DIY Asylum, RE: tried both methods (0.00)
Posted by RayP on 2017-01-20, 17:39:01 (24.126.111.247)
So far I have kept the current at less than 100 ma. It's easy to adjust using the Powerdrive circuit and the main limitation is what current your output transformer can handle. The GK71 pentode has a .......
188: Tube DIY Asylum, tried both methods (0.00)
Posted by RayP on 2017-01-20, 17:19:19 (24.126.111.247)
Well that is very interesting and I thank you for comparing both methods. Somehow I suspect using high frequency AC will now become quite common for directly heated tubes. ray .......
189: Tube DIY Asylum, RE: what kind of builder (0.00)
Posted by RayP on 2017-01-20, 17:11:39 (24.126.111.247)
You can see how I got roughly 20 vac here in the attached link and what I used. Remember that my amp is just a think piece trying out technologies and ideas that would reduce weight. It sounds very go .......
190: Tube DIY Asylum, what kind of builder (0.00)
Posted by RayP on 2017-01-20, 06:03:34 (24.126.111.247)
Maybe I am wrong, but I don't remember anybody achieving low voltages (6.3 and below) with the halogen units so far. 10 vac and 20 vac are achievable. My advice would depend on what kind of builder yo .......
191: Tube DIY Asylum, RE: HFAC safety (0.00)
Posted by RayP on 2017-01-07, 09:07:34 (24.126.111.247)
To add a safety reminder just a little off topic. When you turn off your halo AC unit with the attached capacitor, the cap remains charged. I now put a bleeder resistor across the cap. ray ::: TOPIC:: .......
192: Tube DIY Asylum, choke in ground leg (0.00)
Posted by RayP on 2017-01-04, 07:44:07 (24.126.111.247)
Back in 2006 I posted a question about placing the choke in the ground leg and got several interesting replies. See link below. It made me quite nostalgic to see the names of former posters. ray ::: T .......
193: Tube DIY Asylum, RE: So what about the 813? (0.00)
Posted by RayP on 2016-12-24, 17:27:43 (24.126.111.247)
Pete Millet ties g3 to ground. ray .......
194: Tube DIY Asylum, 240 volt modules (0.00)
Posted by RayP on 2016-12-20, 04:38:43 (24.126.111.247)
I have ordered a few 240 volt modules to see if I can get them down to 4.2 vac for 4P1L tubes. Hopefully it will be easier than using 120 volt modules. They should arrive in the next few days. ray ::: .......
195: Tube DIY Asylum, RE: update (0.00)
Posted by RayP on 2016-12-19, 16:40:54 (24.126.111.247)
Thanks for the update on the AC unit. I think you are correct that there are other parts of your circuit and build that will affect the sound and noise level more. I must admit I was puzzled by your i .......
196: Tube DIY Asylum, RE: High frequency AC vs SMPS for filaments. (0.00)
Posted by RayP on 2016-12-19, 11:36:11 (24.126.111.247)
I had two objectives with my GK71 amp, light weight and the curiosity about whether it would all work and sound decent. I have not done further mods to the high frequency AC heaters and I don't hear h .......
197: Tube DIY Asylum, RE: 6922 as CCS (0.00)
Posted by RayP on 2016-12-17, 08:33:37 (24.126.111.247)
Thanks, ray .......
198: Tube DIY Asylum, 6922 as CCS (0.00)
Posted by RayP on 2016-12-17, 05:32:48 (24.126.111.247)
Out of curiosity, could you post a schematic of how you would use the half 6922 as a CCS? ray .......
199: Tube DIY Asylum, RE: SMPS shielding (0.00)
Posted by RayP on 2016-12-14, 16:32:29 (24.126.111.247)
I would agree with you and I have already installed some shielding that helps a lot. Somehow I suspect I am going to learn a lot from this amp. ray .......
200: Tube DIY Asylum, torroids as chokes (0.00)
Posted by RayP on 2016-12-10, 06:15:38 (24.126.111.247)
Could you describe in more detail the use of torroids as chokes. Do they have an air gap? Could you also describe the plate chokes and how you are using the pots to 'tune' them? ray .......
201: Tube DIY Asylum, RE: HF Filter (0.00)
Posted by RayP on 2016-12-09, 17:18:30 (24.126.111.247)
I would be interested in the calculation equation you use. I actually use four voltages from the stack of smps units. 576 vdc at 100 to 120 ma per channel for the GK-71 tubes 144 vdc at 1.5 ma per cha .......
202: Tube DIY Asylum, reducing ripple (0.00)
Posted by RayP on 2016-12-09, 10:37:35 (24.126.111.247)
Presuming that the ripple is at a high frequency, I suspect the usual 60hz chokes would not work. What kind of choke might work? I also presume a suitably sized cap might be useful as well. Any ideas? .......
203: Tube DIY Asylum, RE: SMPS shielding (0.00)
Posted by RayP on 2016-12-09, 09:57:25 (24.126.111.247)
Unfortunately my scope died. However a local person I know has offered me a scope he inherited which I will pick up next Monday. The idea for the multiple switchers come from the link below. It is a r .......
204: Tube DIY Asylum, separate boxes (0.00)
Posted by RayP on 2016-12-09, 08:54:55 (24.126.111.247)
That would work for me. I could have a metal box for the smps units with suitable outputs for the voltages I usually use. If I keep using the AC units, I could have a separate compartment in the box f .......
205: Tube DIY Asylum, SMPS shielding (0.00)
Posted by RayP on 2016-12-09, 06:28:50 (24.126.111.247)
Now that the high frequency AC discussion has calmed down a bit, I would like to move on to how I can deal with shielding my stack of 48 vdc smps units. Please remember that the reason I am using the .......
206: Tube DIY Asylum, an interesting journey (0.00)
Posted by RayP on 2016-12-08, 11:06:26 (24.126.111.247)
Thanks for all the questions and work, Vinnie as well as TK of course. I think many of us have probably found this subject very interesting. I will probably try increasing the frequency next and perha .......
207: Tube DIY Asylum, 240 voltage modules better for lower voltage tubes (0.00)
Posted by RayP on 2016-12-07, 16:39:50 (24.126.111.247)
That is very interesting. Thanks for the idea for the lower filament voltage tubes. ray .......
208: Tube DIY Asylum, RE: Hey, Find Your Own Links! (0.00)
Posted by RayP on 2016-12-06, 19:10:16 (24.126.111.247)
OK, I admit I am getting old and can't remember too far back. ray .......
209: Tube DIY Asylum, how they work article (0.00)
Posted by RayP on 2016-12-06, 17:06:26 (24.126.111.247)
I found this article very interesting on how they work. http://www.cycloflow.com/2014/05/circuit-analysis-of-typical-electronic.html ray .......
210: Tube DIY Asylum, turntable (0.00)
Posted by RayP on 2016-12-06, 07:18:59 (24.126.111.247)
I use my father's Thorens TD125 so I think I still qualify. ray .......
211: Tube DIY Asylum, cap value (0.00)
Posted by RayP on 2016-12-05, 08:47:30 (24.126.111.247)
The 560 uf was a recommendation from Alex, see link below. You have to scroll down a ways to get to the section on AC heating. '270 to 330uF/400V cap (for European 230-240V AC mains) ' For 115 - 120 A .......
212: Tube DIY Asylum, RE: infrared thermometer (0.00)
Posted by RayP on 2016-12-04, 18:41:57 (24.126.111.247)
Good idea. ray .......
213: Tube DIY Asylum, infrared thermometer (0.00)
Posted by RayP on 2016-12-04, 16:07:00 (24.126.111.247)
I tried using an infrared thermometer in my early tests but did not have too much success since I was only testing a resistor on a sheet of aluminum. I could not get much consistency. However it mi .......
214: Tube DIY Asylum, One puppy per tube (0.00)
Posted by RayP on 2016-12-03, 16:15:00 (24.126.111.247)
I suspect you find find it simpler to have each 813 have its own supply. ray .......
215: Tube DIY Asylum, RE: thermistor (0.00)
Posted by RayP on 2016-12-03, 09:17:25 (24.126.111.247)
Each smps module delivers 48 vdc and I stack them with the grounds not connected. 12 x 48 = 596. 4 x -48 = -192. See link below for where I got the idea from. Most of my amps become too complicated si .......
216: Tube DIY Asylum, diodes (0.00)
Posted by RayP on 2016-12-03, 06:44:59 (24.126.111.247)
The positive connection with the orange wire. The negative connection with the blue wire. On my units there are two diodes on each side that form a bridge. They are connected at the edge and you .......
217: Tube DIY Asylum, RE: thermistor (0.00)
Posted by RayP on 2016-12-03, 06:32:00 (24.126.111.247)
This photo probably shows it best. At the top right you can see the dual switch arrangement which you can read about in the link below. You don't have to use this idea but the photo shows that I co .......
218: Tube DIY Asylum, thermistor (0.00)
Posted by RayP on 2016-12-03, 04:49:11 (24.126.111.247)
I don't know if it is really needed, but I use a thermistor as a part of the turn on circuit. I usually do this for bigger amps. ray .......
219: Tube DIY Asylum, a warning (0.00)
Posted by RayP on 2016-12-03, 04:33:53 (24.126.111.247)
I realized during the night that I had forgotten to warn you that the 560 uf caps develop a 25 to 30 volt charge that is not dissipated. I have placed a 1 meg resistor across the terminals which I pre .......
220: Tube DIY Asylum, RE: Well all the parts finally got here...... (0.00)
Posted by RayP on 2016-12-02, 18:49:04 (24.126.111.247)
Holler away, but I suspect you won't have too many problems. By the way, I performed my inital tests using a power resistor before I tried connecting a tube. I trust you have a multimeter that can me .......
221: Tube DIY Asylum, A story (0.00)
Posted by RayP on 2016-12-02, 05:52:42 (24.126.111.247)
Thanks for all the replies and here is a story along the audio caretaker line. When I first got interested in classical music during my first year of University (Queensland), my father was very please .......
222: Tube DIY Asylum, When you have kicked the bucket (0.00)
Posted by RayP on 2016-12-01, 07:12:18 (24.126.111.247)
To open up a somewhat morbid subject, what will happen to all your 'stuff' when you die? If you are like me, you have lots of tubes some worth a lot, most not worth much at all. You may have some expe .......
223: Tube DIY Asylum, RE: 60W Lighting Transformer Schematic (0.00)
Posted by RayP on 2016-11-20, 04:52:16 (24.126.111.247)
Very interesting link. Thanks for the info. ray .......
224: Tube DIY Asylum, RE: Lighting Transformer Modifications (0.00)
Posted by RayP on 2016-11-19, 10:42:59 (24.126.111.247)
How would you determine the switching frequency and how would you double it? ray .......
225: Tube DIY Asylum, RE: high frequency AC heating (0.00)
Posted by RayP on 2016-11-19, 10:37:13 (24.126.111.247)
Unfortunately no. I've been tempted but the weight issue is a bit of a negative for me now. My second version of the amp with large Audio Note transformers is now getting to the limit of what I am pre .......
226: Tube DIY Asylum, RE: high frequency AC heating (0.00)
Posted by RayP on 2016-11-19, 09:11:45 (24.126.111.247)
Not yet but I will eventually get around to it. Laziness has intervened along with summer and travel. I will probably do another version of the open baffle but I have been playing around with Edge to .......
227: Tube DIY Asylum, RE: high frequency AC heating (0.00)
Posted by RayP on 2016-11-19, 08:20:00 (24.126.111.247)
I use Tannoy red 15" speakers which I inherited from my father. They have a sensitivity of 93 db. http://www.44bx.com/tannoy/Tannoy_ts.html#anchor43934 I do not have the room to use them in large box .......
228: Tube DIY Asylum, RE: high frequency AC heating (0.00)
Posted by RayP on 2016-11-19, 07:59:27 (24.126.111.247)
I have no idea but I see you have to provide 12 -24 vdc as input. In my amp I was trying to reduce weight as much as possible so that is why I chose the AC heating because it was light weight. Why don .......
229: Tube DIY Asylum, high frequency AC heating (0.00)
Posted by RayP on 2016-11-19, 05:23:14 (24.126.111.247)
The 105 watt modules I used are approximately 1.25 " by 4". Remove the casing and it becomes a bit smaller. I used a 560 uf 200 volt cap for 115 volt US. For the 240 volt Europe you would use a 270 to .......
230: Tube DIY Asylum, RE: This would work well - RH813 (0.00)
Posted by RayP on 2016-11-18, 13:50:50 (24.126.111.247)
There was some discussion about this a few weeks ago. http://www.audioasylum.com/forums/tubediy/messages/25/250583.html If you go to the following link and scroll down you can read where Alex gets ri .......
231: Tube DIY Asylum, Worst sounding 2W resistors for filament bias 01A (0.00)
Posted by RayP on 2016-11-14, 05:02:37 (24.126.111.247)
Since you are going to be doing comparisons, it might be useful to try a few other cheaper resistor types to hear if their poor reputation is deserved. It could be fun and informative. ray ::: TOPIC:: .......
232: Tube DIY Asylum, don't feel you are alone (0.00)
Posted by RayP on 2016-11-08, 16:10:43 (24.126.111.247)
We have all made that mistake at some time or another, usually in the middle of the night when our problems or issues seem to magnify. Many of us are relatively quiet about our projects, mistakes, vic .......
233: Tube DIY Asylum, GK-71 (0.00)
Posted by RayP on 2016-11-03, 12:19:41 (24.126.111.247)
Yes, I read your older posts and along with Alex's blog, they encouraged me to try this relatively simple, inexpensive, efficient and light-weight solution. In my case, I was trying to build as light .......
234: Tube DIY Asylum, 40 khz (0.00)
Posted by RayP on 2016-11-03, 10:04:51 (24.126.111.247)
I don't know the frequency of the model I used but it certainly is not in the audio range. Here is a link to a similar model that produces AC at 40 khz. As Alex mentioned in his RH813 amp blog entry, .......
235: Tube DIY Asylum, an example (0.00)
Posted by RayP on 2016-11-03, 05:49:54 (24.126.111.247)
Scroll down the attached link to the AC heating section of an 813 amp to see one way of doing it. I used the following to get 20 vac for my GK71 SE amp. http://www.ebay.com/itm/300810936687 In my cas .......
236: High Efficiency Speaker Asylum, a thread from DIYaudio (0.00)
Posted by RayP on 2016-09-19, 15:30:27 (59.167.244.201)
Not the same as Oswalds Mill but you should find this interesting. ray .......
237: Tube DIY Asylum, Deming, Juran and Japan (0.00)
Posted by RayP on 2016-09-17, 15:45:34 (59.167.244.201)
I am old enough to remember when most Japanese products were considered to be junk. I would not be surprised if the Chinese learned the same lesson and embarked on a quality improvement program simila .......
238: Tube DIY Asylum, RE: Goop (0.00)
Posted by RayP on 2016-09-08, 15:50:37 (59.167.244.201)
I would just put a couple of dabs of Goop on the end of the cap away from the prong connectors. Hopefully I would remember to keep the identifying markings visible from the side. I've used Goop on lar .......
239: Tube DIY Asylum, Goop (0.00)
Posted by RayP on 2016-09-08, 14:52:29 (59.167.244.201)
I have used Goop to mount motor run caps. I haven't used DC Link capacitors yet, but I presume they are lighter weight than motor run. One advantage of Goop is that while the bond is strong, it is not .......
240: Tube DIY Asylum, an alternative (0.00)
Posted by RayP on 2016-08-23, 04:50:07 (24.126.111.247)
A back street in Bangkok. I presume they are power wires up there. ray .......
241: Tube DIY Asylum, cat proofing (0.00)
Posted by RayP on 2016-07-31, 04:44:03 (24.126.111.247)
Our cat likes to sit on my amplifiers to get warm so I designed very simple cages made out of three kitchen cooling racks joined together with twist ties. They are very ugly, but my amps are ugly a .......
242: Tube DIY Asylum, what are they? (0.00)
Posted by RayP on 2016-07-20, 06:14:29 (24.126.111.247)
OK, I will bite. What are they and where do you buy them? ray .......
243: Tube DIY Asylum, More info (0.00)
Posted by RayP on 2016-05-20, 07:14:58 (24.126.111.247)
A long article on the subject. The second paragraph above the photo of the transformer describes your situation. ray .......
244: Tube DIY Asylum, RH813 (0.00)
Posted by RayP on 2016-05-10, 06:14:30 (24.126.111.247)
Link to another 813 possibility is in the link below to Alex Kitic's site. Be sure to read about the high frequency AC filament heating. I used it in my GK71 amp (20 volts) and it worked very well. ht .......
245: SET Asylum, input tubes (0.00)
Posted by RayP on 2016-04-25, 23:16:07 (151.27.115.203)
What are the input tubes? Did you need to match the 6C33Cs? Great looking amps. ray .......
246: Tube DIY Asylum, RE: Question.. Did everyone get their HP Scope or Instek 8246 DVM that bought one? (0.00)
Posted by RayP on 2016-04-15, 04:41:48 (24.126.111.247)
Mine arrived in a box filled with bubble wrap. It seems to work fine so far even though it is a well used one. It came with a power cord. ray .......
247: SET Asylum, GK71 (0.00)
Posted by RayP on 2016-02-25, 14:10:15 (24.126.111.247)
You might enjoy wading your way through this thread by a UK group on building an economical version of this inexpensive Russian tube. It is apparently easier to drive than a GM70 and can run at 500 vo .......
248: Tube DIY Asylum, 3A5 (0.00)
Posted by RayP on 2016-02-14, 08:26:35 (24.126.111.247)
You might find this thread about using a 3A5 interesting, particularly post #8. ray .......
249: Tube DIY Asylum, RE: high frequency AC (0.00)
Posted by RayP on 2016-02-07, 11:31:53 (24.126.111.247)
I purchased two of the 105 watt versions. I have added two turns to the output transformer and hopefully will start testing tomorrow. There are 12 turns giving 12 volts. Hopefully the additional 2 tur .......
250: Tube DIY Asylum, high frequency AC (0.00)
Posted by RayP on 2016-02-07, 10:35:20 (24.126.111.247)
Take a look at the high frequency AC solution mentioned towards the end of this link. I am about to try something similar for a GK71 (20v @ 3 amp). ray .......
251: SET Asylum, only part of the solution (0.00)
Posted by RayP on 2016-02-02, 06:27:49 (24.126.111.247)
Perhaps you might find this link interesting, particularly the idea that the output tube is only a small part of determining the quality of the amplifier's sound. It also points out that there are man .......
252: High Efficiency Speaker Asylum, RE: Amplifier for Tannoy Autograph Reds - 6C33C (0.00)
Posted by RayP on 2015-12-28, 11:43:33 (24.126.111.247)
I inherited my father's Red 15's over ten years ago but was never able to use them since my wife would object to the large boxes required. Recently I had the happy idea to mount them in my open baf .......
253: Tube DIY Asylum, RE: 80 Hz amp (0.00)
Posted by RayP on 2015-11-24, 07:25:10 (24.126.111.247)
I must not have been clear. I was thinking more about the design of an amp that would only go as low as 80 hz. Let me ask more specific questions. Output transformer (SE) Could the inductance requirem .......
254: Tube DIY Asylum, 80 Hz amp (0.00)
Posted by RayP on 2015-11-24, 06:47:51 (24.126.111.247)
As an offshoot of the discussion about speakers for SET, I notice that quite a few use a separate subwoofer with its own amp. I was wondering if anybody designs their amps to roll off at a higher freq .......
255: Tube DIY Asylum, RCA jacks (0.00)
Posted by RayP on 2015-10-21, 11:32:30 (110.23.101.60)
I found your build interesting since I also use wood with roughly the same dimensions, and also washers between the top deck and the sides. Could you post a photo of how you attached your RCA jacks. r .......
256: Tube DIY Asylum, CCS and plate choke in series (0.00)
Posted by RayP on 2015-09-25, 11:29:29 (73.128.250.6)
While I was out driving around this morning, I was pondering the CCS and plate choke in series question that I posed in Andy's 4P1L thread. And thanks for the answer from Tre which explained quite cle .......
257: Tube DIY Asylum, CCS and plate choke in series (0.00)
Posted by RayP on 2015-09-25, 06:00:49 (73.128.250.6)
I'm a bit puzzled why you have both CCS and plate choke. What is the advantage? ray .......
258: Tube DIY Asylum, video about coffee can amp (0.00)
Posted by RayP on 2015-09-18, 17:21:47 (73.128.250.6)
About 6:30 into the video. ray .......
259: Tube DIY Asylum, slotted angle (0.00)
Posted by RayP on 2015-09-07, 05:32:58 (73.128.250.6)
The slotted angle appears to be only 1/2" wide as compared to the 1.25" that I can get at Lowes or Home Depot. Where do you get it? ray .......
260: Tube DIY Asylum, Beer proof (0.00)
Posted by RayP on 2015-09-01, 09:54:18 (73.128.250.6)
You might consider the safety of a tube amp in a college environment. He might enjoy a good pair of head phones more in an environment where other students need to study. Perhaps he could build a hea .......
261: Tube DIY Asylum, RE: interesting alternative (0.00)
Posted by RayP on 2015-08-26, 01:07:11 (73.128.250.6)
Paul, I don't understand the DC voltage offset question. Could you explain a little more. ray .......
262: Tube DIY Asylum, interesting alternative (0.00)
Posted by RayP on 2015-08-25, 16:17:00 (73.128.250.6)
He uses a stack of 48v Cisco SMPS modules. I presume four more modules would not make too much difference raising from 816 volts to 1008. ray .......
263: High Efficiency Speaker Asylum, RE: what cab for tannoy red 15s? (0.00)
Posted by RayP on 2015-08-03, 08:43:19 (86.63.246.103)
Perhaps you could take a look at the following link. The reds are similar to the golds. ray .......
264: Tube DIY Asylum, how calculated? (0.00)
Posted by RayP on 2015-06-29, 08:26:20 (73.128.250.6)
What formula do you use to get the 20+ ma result? ray .......
265: Tube DIY Asylum, RE: Anyone know if this organ output transformer is suitable for HiFi? (0.00)
Posted by RayP on 2015-06-20, 05:36:57 (73.128.250.6)
You might find posts #4 and #9 useful which indicate 3.5k. Of course, it depends on the output independence. ray .......
266: High Efficiency Speaker Asylum, RE: Martin King (0.00)
Posted by RayP on 2015-05-25, 15:53:45 (73.128.250.6)
Try the articles in the URL mentioned below and also the link in my first reply. It will probably also be helpful to read about the Manzanita open baffle speakers at http://www.diyaudio.com/forums/mul .......
267: High Efficiency Speaker Asylum, Martin King (0.00)
Posted by RayP on 2015-05-25, 14:20:59 (73.128.250.6)
I am wondering if you are not aware of Martin King's work with high qts woofers such as the Goldwood 1858. http://www.quarter-wave.com/Project08/Project08.html I have a couple of these 1858's and use .......
268: Tube DIY Asylum, RE: Which A2? (0.00)
Posted by RayP on 2015-03-26, 09:45:03 (68.55.201.220)
Interesting. Which leads to another question. Some data sheets such as the Svetlana 811 and 812 show DC grid current. A typical 845 or GM-70 datasheet does not show this information. Is there a way to .......
269: Tube DIY Asylum, Powerdrive (0.00)
Posted by RayP on 2015-03-25, 19:46:14 (68.55.201.220)
I've used Powerdrive a couple of times and it does work well. ray .......
270: Tube DIY Asylum, What makes a tube good or not good for A2 (0.00)
Posted by RayP on 2015-03-25, 15:49:07 (68.55.201.220)
I've been wondering about this for a while and I suspect there is more to this than meets the eye. Could you give examples of both yeah and nay with the reasons why. ray .......
271: SET Asylum, RE: CCS (0.00)
Posted by RayP on 2015-03-25, 15:44:51 (68.55.201.220)
That explains it. Essentially the same as loading an input or driver tube. ray .......
272: SET Asylum, CCS (0.00)
Posted by RayP on 2015-03-25, 04:50:45 (68.55.201.220)
A solid state CCS as the plate load for an output tube is a bit difficult to implement because of the heat. Could you describe how it was accomplished in these amps? ray .......
273: Tube DIY Asylum, Schottky Rectifiers in series (0.00)
Posted by RayP on 2015-02-27, 17:05:15 (68.55.201.220)
Past posts suggested that Schottkys in series was not recommended but I see you are using cap bypasses. What value are you using? ray .......
274: High Efficiency Speaker Asylum, Tannoy Thiele & Small Parameters (0.00)
Posted by RayP on 2015-02-17, 05:53:13 (68.55.201.220)
See link. The web site also has numerous examples of cabinets. ray .......
275: Tube DIY Asylum, two 32 mh chokes in series - graphs (0.00)
Posted by RayP on 2015-02-05, 08:11:49 (68.55.201.220)
I was curious to see what the two chokes in series would look like. I hope I have duplicated the setup correctly. If I am understanding this correctly, it seems to show a DCR of (507 - 480) = 27 w .......
276: Tube DIY Asylum, International meet (0.00)
Posted by RayP on 2015-02-02, 18:18:32 (68.55.201.220)
Closer to the time they roll out the red carpet for me when I graciously arrive in Sydney to collect my fully undeserved knighthood, I will let you know. And of course, my name is not Philip. Is there .......
277: Tube DIY Asylum, Sydney (0.00)
Posted by RayP on 2015-02-02, 14:12:36 (68.55.201.220)
As I remember you live in Sydney and I will probably be there in November. I'll contact you closer to the time and and perhaps we could share a drop or two of the good stuff. Actually it will probably .......
278: Tube DIY Asylum, two 32 mh chokes in series (0.00)
Posted by RayP on 2015-02-02, 12:56:56 (68.55.201.220)
Try changing L1 to 64mh 20 ohms. Keep everything else the same. I presume that two 32mh chokes in series is equal to a single 64 mh choke. The results appear to be better. ray .......
279: Tube DIY Asylum, the tube taster (0.00)
Posted by RayP on 2015-02-02, 06:10:05 (68.55.201.220)
One of my early projects over 10 years ago was the 'tube taster'. It was a parafeed linestage where I could quickly switch between six different tube types, 76, 6N1P, 5687, 5965 and two different bran .......
280: Tube DIY Asylum, my personal guidelines (0.00)
Posted by RayP on 2015-01-29, 05:56:39 (68.55.201.220)
I am more inclined to read a post if - the depth level is - the poster is someone whose past opinions have been useful - if the message is a response to something I posted - if somebody takes the time .......
281: Tube DIY Asylum, 10 times (0.00)
Posted by RayP on 2015-01-22, 18:01:38 (68.55.201.220)
I must admit I'm puzzled. I can see why the 3.2K resistor is in parallel with the output transformer for a net of 1500 approx. What puzzles me is what is wrong with a load of 1500 for an Rp of 500 whi .......
282: Tube DIY Asylum, RE: pri. 110V power transformer - puzzled (0.00)
Posted by RayP on 2015-01-03, 08:00:29 (68.55.201.220)
OK, that makes sense. Thanks. ray .......
283: Tube DIY Asylum, RE: pri. 110V power transformer - puzzled (0.00)
Posted by RayP on 2015-01-03, 05:09:02 (68.55.201.220)
Ok, I get the warnings and I have no intention of doing it, but I would like a bit more detail about why using double the voltage should be bad. From what I understand, the main reason not to do this .......
284: SET Asylum, Goop (0.00)
Posted by RayP on 2014-12-13, 14:06:28 (68.55.201.220)
Mounting motor run caps can be a pain. I have had great success with using Goop to attach them to wood, metal and polycarbonate. You can remove the caps with some effort, sometimes even more than a li .......
285: SET Asylum, RE: two 156C in series (0.00)
Posted by RayP on 2014-12-09, 05:27:18 (68.55.201.220)
It took me a while but finally I can see why the cold 6J5 would be a problem. For educational purposes, if I used the dual switch arrangement that turns on the heaters first, would the second inductor .......
286: SET Asylum, two 156C in series (0.00)
Posted by RayP on 2014-12-08, 06:10:24 (68.55.201.220)
Hi Paul, I was reading the following from Gary P about using two of the inductors in series. See post #5 in the link. The 22v drop of the second inductor could account for almost the whole drop of the .......
287: SET Asylum, Operating and shelf life for motor runs (0.00)
Posted by RayP on 2014-12-08, 01:17:16 (68.55.201.220)
The link to a PDF on the Digikey site states: RELIABILITY AND LIFETIME AC capacitors are rated for a full service life of 60,000 h with an estimated 94% survival rate when operated at full rated volta .......
288: SET Asylum, Another source for motor runs (0.00)
Posted by RayP on 2014-12-07, 15:55:30 (68.55.201.220)
I have a bunch of 45 / 7 400 vac round motor run caps from this store. My understanding is that the DC rating is at least 1.4 times the 400 VAC rating. The store doesn't have them now but there are ot .......
289: SET Asylum, RE: Great Amps (0.00)
Posted by RayP on 2014-11-18, 19:05:48 (68.55.201.220)
What tubes are being used? It looks like 3CX300A in the front. What are the ones at the back? ray .......
290: SET Asylum, RE: Commercial mfrs. (0.00)
Posted by RayP on 2014-10-24, 06:53:37 (68.55.201.220)
There is also the Bottlehead kit. ray .......
291: Tube DIY Asylum, dual DTDTs (0.00)
Posted by RayP on 2014-04-27, 03:42:22 (68.55.201.220)
An alternative is to use two DPDTs. Take a look at the link for the circuit. ray .......
292: Tube DIY Asylum, RE: Material/product for mounting coupling and bypass caps (0.00)
Posted by RayP on 2014-02-21, 05:09:20 (68.55.201.220)
I think you mean double sided tape. http://www.lowes.com/Paint/Glues-Tapes/Double-Sided-Mounting-Tape/_/N-1z0yyek/pl#! I have also used a glue called Goop which is very effective. Best of all, with su .......
293: SET Asylum, layout (0.00)
Posted by RayP on 2014-02-07, 05:37:41 (68.55.201.220)
If you have not built an amplifier before, building a Bottlehead kit is a great way to learn good layout design. Build the amp according to the instructions and the chances are you will have a good wo .......
294: SET Asylum, plate resistor (0.00)
Posted by RayP on 2013-09-29, 14:21:57 (202.168.105.38)
An alternative is to double your B+ and use a plate resistor instead of the plate choke. You then have the problem of getting rid of the heat from the plate resistor. ray .......
295: Tube DIY Asylum, RE: cheap parafeed OPT... (0.00)
Posted by RayP on 2013-08-18, 06:49:05 (68.55.201.220)
So what is the magic incantation? ray .......
296: Tube DIY Asylum, Aluminum Organic Polymer Capacitors (0.00)
Posted by RayP on 2013-07-20, 04:18:33 (12.167.136.173)
Has anybody tried United Chemicon Aluminum Organic Polymer Capacitors with driver tubes like the 6N1P? I've used them in power supplies for low voltages for a DAC and they seemed to be an improvement. .......
297: High Efficiency Speaker Asylum, Martin King (0.00)
Posted by RayP on 2013-01-18, 06:08:08 (12.167.136.173)
You might take a look at Martin King's website, particularly the section on open baffle and also the Projects section. ray .......
298: SET Asylum, RE: Thanks for those links (0.00)
Posted by RayP on 2012-12-01, 07:26:02 (12.167.136.173)
Earlier this year I built a Fetzilla. The cat is sitting on it as I type this. It's 50 watts and costs $200 - 250 to build depending on the parts you might have laying around. You get two circuit boar .......
299: SET Asylum, RE: The Pass amp doesn't use Sony vfets. Nt (0.00)
Posted by RayP on 2012-12-01, 05:40:09 (12.167.136.173)
True. The original Pass amp called for either an IXTH20N50 depletion mode Mosfet or an IXTH6N50D2 depending on which version of the amp you built. http://www.firstwatt.com/pdf/art_delite.pdf The threa .......
300: SET Asylum, 2SK82 (0.00)
Posted by RayP on 2012-11-30, 06:12:41 (12.167.136.173)
I don't think it is custom and is available at the source below. It will probably become unobtainium. Definitely not in the $2 range however. ray .......
301: SET Asylum, RE: $5,000 for a single element transistor amp, youch! (0.00)
Posted by RayP on 2012-11-30, 05:22:41 (12.167.136.173)
Why not try the DIY approach. I am going to have a go at this Simple SIT amp for something different to do. I have the bulbs and a bunch of heatsinks. The thread also has inductor and CCS alternatives .......
302: High Efficiency Speaker Asylum, RE: Neville Thiele dead at 91 (0.00)
Posted by RayP on 2012-10-25, 08:53:49 (12.167.136.173)
I met him in the early 80's in Brisbane. He was a very polite gentleman who was somewhat bemused by the fame. ray .......
303: High Efficiency Speaker Asylum, RE: My 604-8G's have a 70V transformer hooked up (0.00)
Posted by RayP on 2012-10-23, 06:15:24 (12.167.136.173)
They can be used in a single ended parafeed amplifier as the output transformer. The very cheap Radio Shack models from a few years back actually sounded pretty decent though they were a bit light in .......
304: Tube DIY Asylum, Voltage limits (0.00)
Posted by RayP on 2012-10-23, 06:04:59 (12.167.136.173)
I just took look at Mouser and virtually all of their carbon film resistors have a limit well below 600v. The highest was 500v with some in the 200 - 350 volt range. They do stock metal film resistors .......
305: SET Asylum, gone the other way for a while (0.00)
Posted by RayP on 2012-08-31, 05:29:16 (12.167.136.173)
It's sacrilege I suppose but for the last half year I have been listening to a Fetzilla that I built. The reason is a cat that we inherited. She likes to get warm and was getting too close to my tube .......
306: Tube DIY Asylum, fire plans (0.00)
Posted by RayP on 2012-08-30, 17:10:18 (12.167.136.173)
At least amplifier building will continue. Those of you who live in areas where fires like this happen might like to take a look at the following link from the New South Wales Rural Fire Service in Au .......
307: Tube DIY Asylum, RE: Spam (0.00)
Posted by RayP on 2012-06-22, 23:17:09 (217.229.67.153)
I hope all turns out well for you. We all appreciate the information you gave to us over the years. Are you still doing the wine consulting? ray .......
308: Tube DIY Asylum, RE: Article and Video Today, on Conducting (0.00)
Posted by RayP on 2012-04-08, 06:52:51 (12.167.136.173)
That is a great article. Thanks for sharing it. I've been attending the Philly band for 25 years and it's been very interesting to watch the good and great conductors trying to get this finicky group .......
309: SET Asylum, no artificial edge to the initial attack (0.00)
Posted by RayP on 2012-03-25, 05:39:23 (12.167.136.173)
This was what I hear as well and for me, this probably is the biggest factor though there are others as well. ray .......
310: Tube DIY Asylum, RE: 6S17K planer to GU-15 (0.00)
Posted by RayP on 2012-03-23, 16:11:48 (12.167.136.173)
You are correct. I bought 10 of them and found it very easy to swap them and match them up into pairs. There was considerable variation. As far as I can tell, they are very un-microphonic, which is ra .......
311: Tube DIY Asylum, RE: 6S17K planer to GU-15 (0.00)
Posted by RayP on 2012-03-22, 17:32:32 (12.167.136.173)
I had fun playing with the 6S17K as a line stage. It turned out that I really liked the sound of it despite it's disadvantage in the line stage role. Changing the volume produces a scratchy noise. ray .......
312: High Efficiency Speaker Asylum, upward facing (0.00)
Posted by RayP on 2012-03-14, 05:49:31 (68.45.171.15)
Briggs used an upward facing tweeter with his open baffle. ray .......
313: High Efficiency Speaker Asylum, RE: Best enclosure for a tannoy monitor black 15" (0.00)
Posted by RayP on 2012-02-27, 06:09:03 (68.45.171.15)
My father had a friend who bought a pair of Tannoy GRF Autographs back in 1965. He was still alive two year's ago and his speakers were still going as well, forty-five years later. He always regretted .......
314: High Efficiency Speaker Asylum, RE: Tannoy (0.00)
Posted by RayP on 2012-02-11, 17:26:37 (12.167.136.173)
It's a horn design. I'm not qualified to answer your second question. ray .......
315: High Efficiency Speaker Asylum, Tannoy (0.00)
Posted by RayP on 2012-02-11, 05:27:08 (12.167.136.173)
You might find something amongst the Tannoy cabinet designs that would work for you. Perhaps the rectangular GRF? ray .......
316: Tube DIY Asylum, RE: Tube amp Heat question (0.00)
Posted by RayP on 2012-01-07, 05:57:31 (12.167.136.173)
Looking at the schematic, I see there would be two 7247 tubes and four 6BQ5 tubes. The filament for each 7247 tube (6.3 volts at 0.3 amps) would be about 2 watts. The maximum power dissipation for the .......
317: SET Asylum, RE: salt and pepper (0.00)
Posted by RayP on 2011-12-31, 06:35:00 (12.167.136.173)
Hi Doug, It's good to hear from you. Our group misses you and your amps. I suppose there is another way to look at pepper in that it has been around for an awfully long time (even predating output tub .......
318: SET Asylum, salt and pepper (0.00)
Posted by RayP on 2011-12-28, 05:12:14 (12.167.136.173)
As a follow on to Paul's post which describes the whole meal, consider the input tube (salt) as well. They all seem to have a different sound as well as needing to be suitable for driving the output t .......
319: Tube DIY Asylum, other amps (0.00)
Posted by RayP on 2011-12-27, 19:24:01 (12.167.136.173)
I took a look at some of Andrea's other amplifier designs. He apparently prefers his hybrid design to his GM70 amp. ray .......
320: SET Asylum, Mercury arc valves (0.00)
Posted by RayP on 2011-12-18, 05:52:04 (12.167.136.173)
I think the rectification could feature these. They are about four feet long. If you go to Cockatoo Island in Sydney Harbor they have about a dozen of these sitting around in the former Power Station. .......
321: Tube DIY Asylum, RE: Radio Noises (0.00)
Posted by RayP on 2011-12-04, 05:39:49 (12.167.136.173)
I grew up with AM (4MB)in Maryborough, QLD. I remember that when I got home from school in the afternoon, I could listen to the local station and the Brisbane stations such as 4BC. Later in the evenin .......
322: SET Asylum, RE: just for fun - 6V6 (0.00)
Posted by RayP on 2011-11-21, 06:02:32 (12.167.136.173)
The builder of the 4th amp was Jim Dowdy. He said it was sounding great the night before so it was a pity it was out of action on the day of the competition. ray .......
323: SET Asylum, just for fun - 6V6 (0.00)
Posted by RayP on 2011-11-19, 04:42:50 (68.45.171.15)
I'm not clear whether you would be interested in DIY, but take a look at the link for the entries in our 6V6 amp under $200 competition with case from Ikea. The winning entry came in at $150 and it re .......
324: High Efficiency Speaker Asylum, RE: Emma's a pom and has a very distinct soft contralto tone! (0.00)
Posted by RayP on 2011-11-07, 13:13:49 (68.45.171.15)
Yeah I can't stand the top 100. But then again, I thought I heard him say Mahler's 8th towards the end of the race and so I went back and checked and there it was at 3:08. Great description as 'stone .......
325: High Efficiency Speaker Asylum, RE: To ighten the mood a little, yesterday in Aus was Melbourne Cup Day (0.00)
Posted by RayP on 2011-11-07, 12:12:16 (68.45.171.15)
I finally got to a fast connection where I could hear it and thanks for sharing it. Having only returned from Oz a couple of weeks ago I still miss the accents. Isn't it funny how the ABC classic anno .......
326: High Efficiency Speaker Asylum, Martin King (0.00)
Posted by RayP on 2011-09-05, 05:13:57 (12.167.136.173)
Take a look at the Martin King website. There is a section on open baffle theory and in-depth descriptions of his projects. An example would be a Jordan JX92S on top of a high qts Goldwood 18 inch spe .......
327: Tube DIY Asylum, any advantage over Radio Shack (0.00)
Posted by RayP on 2011-08-08, 12:15:49 (83.141.142.158)
Thanks for letting us know. Considering that the equivalent 115 V / 12.6 vct versions from Radio Shack are considerably cheaper, is there any advantage to the Edcore models? ray .......
328: Tube DIY Asylum, RE: curious about this too (0.00)
Posted by RayP on 2011-08-05, 09:11:45 (83.141.142.158)
So how did you measure it? ray .......
329: Tube DIY Asylum, calculating Z? (0.00)
Posted by RayP on 2011-08-05, 07:34:41 (83.141.142.158)
Hi Doug, Is there a formula for calulating Z for a cascode CCS such as you described? I'm wondering if it is relatively independent of plate resistance. ray .......
330: High Efficiency Speaker Asylum, RE: using 4 drivers per chanel can lower frequency response? (0.00)
Posted by RayP on 2011-07-20, 19:17:44 (12.167.136.173)
Thanks for the answer to my first question. Would you have an answer to the 2nd question about how low can you go. I was looking at the progression for the fs where it appears that the rate of drop in .......
331: High Efficiency Speaker Asylum, RE: using 4 drivers per chanel can lower frequency response? (0.00)
Posted by RayP on 2011-07-20, 09:02:46 (12.167.136.173)
I must admit I've never heard of this before. How does it work? Would it also mean that if we keep doubling the number of drivers, we eventually get down to a fs of 1hz? ray .......
332: SET Asylum, RE: Hah!!!! (0.00)
Posted by RayP on 2011-07-11, 15:30:10 (69.196.189.89)
Hi Doug, Your message made me look at some of the photos of those monsters that required two people to carry them into the library. Do you still build them that big? ray .......
333: SET Asylum, RE: How to bridge from kit building to personal DIY projects (0.00)
Posted by RayP on 2011-07-11, 05:31:22 (69.196.189.89)
These look like they would be what you could use. ray .......
334: SET Asylum, RE: How to bridge from kit building to personal DIY projects (0.00)
Posted by RayP on 2011-07-11, 05:28:38 (69.196.189.89)
I'm not aware of any special insulation. ray .......
335: SET Asylum, RE: How to bridge from kit building to personal DIY projects (0.00)
Posted by RayP on 2011-07-10, 05:08:51 (69.196.189.89)
Turrets can be difficult to source. I got a bunch of them from All Electronics some years ago but they are sold out now. Sometimes one of the Russian sellers on Ebay has some but I can't remember whic .......
336: SET Asylum, RE: How to bridge from kit building to personal DIY projects (0.00)
Posted by RayP on 2011-07-09, 14:56:52 (69.196.189.89)
Layout is probably one of the most difficult aspects once you decide on your schematic and component values. I find it useful to use Visio to do the layout of what I propose to do. I can move the com .......
337: SET Asylum, DC DIY audio group (0.00)
Posted by RayP on 2011-06-27, 05:14:22 (12.167.136.173)
I will be away for the show, but I wasn't aware of this group. Any details or contacts? ray .......
338: SET Asylum, silver mica (0.00)
Posted by RayP on 2011-05-05, 06:08:00 (174.57.236.72)
Since nobody else has mentioned them, silver mica SSG. Relatively inexpensive but their large size can be problematic. ray .......
339: Tube DIY Asylum, RE: source for 100uF motor run caps? (0.00)
Posted by RayP on 2011-04-23, 05:42:16 (12.167.136.173)
88 uf is the largest at this place. ray .......
340: SET Asylum, RE: HT comes on before filament is heated enough (0.00)
Posted by RayP on 2011-03-30, 05:24:14 (12.167.136.173)
Take a look at the link below which uses two DPDT switches operating at normal voltages. It works well but note that it does not protect against a power outage / quick restore. ray .......
341: Tube DIY Asylum, Allen did comment (sort of) (0.00)
Posted by RayP on 2011-03-28, 05:46:53 (12.167.136.173)
In the April 2002 edition of audioXpress (page 69), Allen wrote a letter responding to Eric Barbour's grounded cathode use of a 6S17K in his "A planar triode phono preamp" in the November 2001 edition .......
342: Tube DIY Asylum, I second the Goop (0.00)
Posted by RayP on 2011-03-16, 18:24:14 (12.167.136.173)
Amazing stuff. Cure it overnight with a bit of pressure and you are good to go. Even better, it is still possible to remove the caps with pressure if you need to disassemble. Forget the clamps. ray :: .......
343: Tube DIY Asylum, RE: Do we know or have a written record of the "pop" music in the 17th-19th Centuries in UK and Europe? (0.00)
Posted by RayP on 2011-03-06, 11:44:32 (12.167.136.173)
It's an interesting question. First I think it's helpful to look at Wikipedia's articles about 'folk music' 'pop music' 'classical music' and it becomes obvious that there are multiple definitions. Al .......
344: Tube DIY Asylum, as recommended by Allen Wright (0.00)
Posted by RayP on 2011-03-02, 04:56:15 (174.57.236.72)
The best memorial we can have for Allen is to look up his old posts. I remembered his answer to one of my questions. ray .......
345: Tube DIY Asylum, Industrial transformers (0.00)
Posted by RayP on 2011-02-21, 16:46:17 (12.167.136.173)
Industrial transformers are often inexpensive on Ebay. There are all sorts of configurations and VA capacities but there are often 120 to 240 or 480 versions. They can be very handy for power amplifie .......
346: Tube DIY Asylum, RE: Found it... (0.00)
Posted by RayP on 2011-02-20, 05:51:01 (174.57.236.72)
I must be missing something. I see where the 12 volts arrives, but where does the final filament voltage come out? I presume it's not at the top right because it looks like the current would have to p .......
347: Tube DIY Asylum, RE: Shunt Regulator Question (0.00)
Posted by RayP on 2011-02-10, 18:08:25 (12.167.136.173)
I have not come across the word transorb before and after a bit of research I see it is a zener diode that is engineered for high power current switching. Could you supply a sample part number so that .......
348: SET Asylum, RE: Schematic Detail - 'primaries and secondaries' (0.00)
Posted by RayP on 2011-02-02, 07:55:20 (12.167.136.173)
Thanks for the detailed reply. I'm puzzled by your connecting the secondaries for each transformer in opposite phase. When I used toroids for my inexpensive 6V6 amp, I used the secondaries in phase an .......
349: SET Asylum, RE: Schematic Detail (0.00)
Posted by RayP on 2011-02-02, 05:53:51 (12.167.136.173)
Hi Luca, With L4 and L8, are you only using one of the secondaries of each transformer or do you parallel the secondaries? ray .......
350: SET Asylum, RE: Thinking of pulling the switch · Please help! (0.00)
Posted by RayP on 2011-02-01, 05:15:27 (12.167.136.173)
I would certainly encourage you to take up Paul's offer and go to Bottlehead headquarters. I realize that you don't want to go the DIY route for reasons of the appearance of the final product, but my .......
351: SET Asylum, DIY (0.00)
Posted by RayP on 2011-01-29, 18:38:14 (12.167.136.173)
It seems to me that you are ready to DIY. Over ten years ago I heard the late great Gizmo say that no amplifier will ever sound as good as one that you build yourself (or words to that effect). He was .......
352: Tube DIY Asylum, RE: This Loadline is possible ? (0.00)
Posted by RayP on 2011-01-29, 14:17:42 (12.167.136.173)
Would I be correct that Tubelab's powerdrive would be ok for this? ray .......
353: Tube DIY Asylum, RE: suck it and see (0.00)
Posted by RayP on 2011-01-14, 09:37:22 (12.167.136.173)
I'm not sure what constitutes a 'classic' LSES these days. I used this old 2006 message with a smaller C1 than 15uf because that is what I had available at the time. As you say in your message, trying .......
354: Tube DIY Asylum, suck it and see (0.00)
Posted by RayP on 2011-01-13, 17:00:44 (12.167.136.173)
There is an old Australian phrase, 'suck it and see' which essentially means that you won't know until you try it yourself. Since I build amplifiers because I am curious and it's fun to do, I tried th .......
355: Tube DIY Asylum, ultrasonic heaters (0.00)
Posted by RayP on 2011-01-12, 16:56:03 (12.167.136.173)
Could you expand a little on your ultrasonic heaters. ray .......
356: Tube DIY Asylum, RE: I think they will be more than good enough! (0.00)
Posted by RayP on 2010-12-21, 06:52:59 (12.167.136.173)
I also used their 115+115 : 9+9 transformers in my entry for the 6V6 under $200 competition our small group held earlier this year. Initially the parafeed amp sounded a bit course but it really improv .......
357: Tube DIY Asylum, Fine for me (0.00)
Posted by RayP on 2010-12-19, 16:57:48 (12.167.136.173)
I've ordered from them a couple of times and it's been fine both times. 9 volt, 12 volt and 450 volt. Delivery within three days each time, but then again, I live in Maryland which is pretty close to .......
358: Tube DIY Asylum, RE: ...the better it sounds? (0.00)
Posted by RayP on 2010-11-25, 06:15:21 (12.167.136.173)
Hey Douglas, Do those KBG 200v versions really handle 400v as claimed? ray .......
359: Tube DIY Asylum, plate connections (0.00)
Posted by RayP on 2010-11-13, 18:39:35 (12.167.136.173)
What are the plate connections? Could you provide a close up photo? I've never seen 829B with a blue glow before. How do you do that? ray .......
360: Tube DIY Asylum, under $200 (0.00)
Posted by RayP on 2010-10-29, 14:28:03 (12.167.136.173)
I'm not sure of the efficiency of the JBLs but you might consider one of the following single ended amps that were in a recent 6V6 competition, all of which cost under $200. Some are more complicated .......
361: Tube DIY Asylum, Bitten (0.00)
Posted by RayP on 2010-10-29, 06:43:17 (12.167.136.173)
Does your new moniker referring to Beethoven's Opus 48 No 1, a song called Bitten? Or is it the Chopin Nocturne? Or somebody else's Opus 48? Just curious. ray .......
362: Tube DIY Asylum, RE: Construction Hints - grate material? (0.00)
Posted by RayP on 2010-10-25, 05:07:02 (12.167.136.173)
Interesting. What is the grate made of? ray .......
363: Tube DIY Asylum, hearing test (0.00)
Posted by RayP on 2010-10-25, 05:01:30 (12.167.136.173)
Periodically I check my ears out on one of the free hearing test sites. At almost 63, I am down to somewhere between 10 khz and 12 khz. Back in my thirties, I could hear 20 khz. .......
364: SET Asylum, diy (0.00)
Posted by RayP on 2010-10-18, 05:37:36 (174.57.236.72)
I am another who recommends the DIY approach. There is something wonderful about an amp that you built yourself. That being said, if you've never built before, you need to have some lessons. Like one .......
365: Tube DIY Asylum, RE: Exposed anode connections (0.00)
Posted by RayP on 2010-08-02, 03:24:04 (121.208.214.9)
Could you let us know the maker and model number for the anode connectors. They certainly look good. ray .......
366: SET Asylum, PSUD (0.00)
Posted by RayP on 2010-04-18, 23:25:22 (86.148.164.49)
You might find it interesting to try Duncan Amps PSUD simulator. It's free and used by a lot of inmates. ray .......
367: Tube DIY Asylum, RE: Choke placement in power supplies - discussion in 2008 (0.00)
Posted by RayP on 2010-03-25, 15:03:53 (64.16.143.131)
Take a look at the link for the discussion on this subject from 2008. Perhaps the most interesting post came from Dave Cigna about stray capacitance. ray .......
368: High Efficiency Speaker Asylum, Goldwood GW-1858 H frame (0.00)
Posted by RayP on 2010-02-06, 05:36:09 (12.167.136.173)
Hi Godzilla, Could the FE103e be used as a substitute for the Jordan or Fostex F120A along with the 18" Goldwood or the 15" Eminence Alpha 15A in a Martin J King H-frame open baffle? I seem to remembe .......
369: Tube DIY Asylum, Goop (0.00)
Posted by RayP on 2010-01-14, 05:20:29 (24.0.47.88)
Following a suggestion from some other forum member a while back, I've been using this glue for attaching motor run caps. It's surprisingly effective and you can get it at many hardware stores. Try i .......
370: Tube DIY Asylum, multimeter (0.00)
Posted by RayP on 2010-01-07, 05:23:30 (12.167.136.173)
It does not directly solve your problem but you might find the following link on using multimeters helpful in future testing. ray .......
371: Tube DIY Asylum, copper pipe question (0.00)
Posted by RayP on 2009-12-09, 17:15:23 (12.167.136.173)
Slightly off topic, but could copper pipe be used instead? Presumably, solid would have lower resistance, but would it make a big difference? rat .......
372: Tube DIY Asylum, 2nd half (0.00)
Posted by RayP on 2009-12-03, 05:56:22 (12.167.136.173)
The second half has a number of designs including his OTL with EL509's, a grounded grid line stage and his version of a single ended amp with 6550's in a cathode follower arrangement. These are worth .......
373: Tube DIY Asylum, the caps (0.00)
Posted by RayP on 2009-11-25, 05:43:42 (204.97.106.23)
Out of curiousity, how did you come with the 150uf value for the caps? ray .......
374: Tube DIY Asylum, RE: SV811-10 DC filament supply (0.00)
Posted by RayP on 2009-11-22, 17:03:24 (12.167.136.173)
I've recently completed a 12HG7 with a Gary Pimm CCS - SV811-10 SE amp. I used the Tubelab powerdrive (see URL) which amongst other things, sets the bias. It's running about 675v and 80 ma. The filame .......
375: Tube DIY Asylum, also at Mouser (0.00)
Posted by RayP on 2009-11-18, 05:51:22 (204.97.106.105)
See link below for what Mouser carries in the Koa 1 watt and above range. ray .......
376: SET Asylum, Agreed (0.00)
Posted by RayP on 2009-11-04, 17:44:32 (12.167.136.173)
In many ways, John was an artist. He had his own very distinctive style of amplifier building and you are lucky enough to own one of his creations. Treat it like you would a painting and leave the amp .......
377: SET Asylum, Cincinatti (0.00)
Posted by RayP on 2009-10-21, 05:54:48 (12.167.136.173)
About 12 years ago I decided that I was going to try to build something so I built a Nelson Pass design, Son of Zen. I had taken a soldering course at the local community college and managed to get th .......
378: Tube DIY Asylum, trying the stereo version (0.00)
Posted by RayP on 2009-10-21, 05:10:31 (12.167.136.173)
So I ordered the stereo version. Thanks for the offer of help but I should be ok. ray .......
379: SET Asylum, Where do you live? (0.00)
Posted by RayP on 2009-10-20, 17:41:13 (12.167.136.173)
Since nobody has asked already, I will ask the question. Where do you live? There is always a chance that somebody lives relatively close to you so that you can go and listen to their system. You may .......
380: Tube DIY Asylum, which vendor? (0.00)
Posted by RayP on 2009-10-20, 05:08:19 (204.97.106.80)
Tried looking on Ebay but couldn't find them. Could you give a link? Thanks in advance ray .......
381: Tube DIY Asylum, It's rained all day and it's still cold here in Maryland... (0.00)
Posted by RayP on 2009-10-17, 16:10:54 (12.167.136.173)
Perhaps since you live in MD you need something different to think about. Take a look at the link below. ray .......
382: Bottlehead Forum, Electrical tape (0.00)
Posted by RayP on 2009-10-12, 06:28:37 (12.167.136.173)
So is this where you drag out the electrical tape and wrap the exposed voltages? A thought just popped into my mind. Would a tube/socket that is prone to ringing be better damped at the end of a bunch .......
383: Bottlehead Forum, RE: Demo of Horn Shoppe speakers and/or Madisound BK-16 speakers (0.00)
Posted by RayP on 2009-09-29, 15:15:40 (12.167.136.173)
Sorry, I can't do this weekend. Sister & brother-in-law arriving and much wine to be drunk. ray .......
384: Bottlehead Forum, RE: Demo of Horn Shoppe speakers and/or Madisound BK-16 speakers (0.00)
Posted by RayP on 2009-09-27, 18:30:21 (12.167.136.173)
Ok, I shoudl be able to bring them since they aren't that big. Fritz, let me know when you have them and I will come around and collect them. ray .......
385: Bottlehead Forum, building speakers (0.00)
Posted by RayP on 2009-09-27, 06:37:20 (12.167.136.173)
I'm a bit envious of those of you who build speakers. I am restricted to the back deck out in the open so I only build when I think there will be good weather for a while. Perhaps I should move to Sti .......
386: Bottlehead Forum, RE: why not come to the Stirling, VA meet - see posting below (0.00)
Posted by RayP on 2009-09-27, 05:05:44 (12.167.136.173)
I remembered this morning that I had seen 'jelx' before and that you came to the meet in PA. So obviously you know all about us. Take a look at the half chang concept in the link below. At the last me .......
387: Bottlehead Forum, why not come to the Stirling, VA meet - see posting below (0.00)
Posted by RayP on 2009-09-26, 17:54:09 (12.167.136.173)
A few years back one of our members, Fritz, brought the BK-16's along to a few meets but I don't think he has them now. There usually is a selection of relatively hi-eff speakers so you can hear some .......
388: Bottlehead Forum, RE: OT: Can someone help me with LED Lights in a display cabinet (0.00)
Posted by RayP on 2009-09-14, 12:22:56 (204.97.106.88)
Maybe I'm not understanding your request correctly, but could a string of Xmas lights do the job if they are not too big in size? Hide the ones you don't need if there are too many on the string. ray .......
389: Bottlehead Forum, RE: Dc, Md, Va, Bottlehead meet. (0.00)
Posted by RayP on 2009-09-13, 10:05:51 (12.167.136.173)
Any weekend (other than Thanksgiving) works for me. I'll be bringing my new 12HG7 / SV811-10 monstrosity and I hope to have a Switcheroni 6V6 amp that we can use to test our procedures for the 6V6 com .......
390: Bottlehead Forum, RE: dead transformer (0.00)
Posted by RayP on 2009-09-11, 14:42:29 (12.167.136.173)
We were thinking of doing a run thru test of our procedures for the 6V6 competition later this year so there might be another meet in a month or so. We are planning to use Steve's waveguide / JBL LE14 .......
391: Bottlehead Forum, dead transformer (0.00)
Posted by RayP on 2009-09-11, 06:14:20 (12.167.136.173)
Glad to hear you are getting it fixed. We all struggle building this stuff and it is such a nice surprise when sound comes out of the speakers. I usually do a little jig as well to celebrate. My lates .......
392: Tube DIY Asylum, RE: stepped current load question (0.00)
Posted by RayP on 2009-09-07, 06:32:20 (12.167.136.173)
Thanks for the info. I have been playing around more with PSUD and have been getting the recover down to about 80 ms so I see some improvment is still possible. ray .......
393: Bottlehead Forum, RE: Finishing the Galactica speaker project (0.00)
Posted by RayP on 2009-09-07, 06:29:12 (12.167.136.173)
The rest of us just stand back and gaze in rapt admiration. ray .......
394: Tube DIY Asylum, stepped current load question (0.00)
Posted by RayP on 2009-09-06, 05:15:43 (12.167.136.173)
I've never used stepped current load before. I've just tried it out but I'm not sure what a suitable drop in current would be. Let's say value 1 is 100 ma. What would be a suitable value 2 be? Having .......
395: Tube DIY Asylum, Ford (0.00)
Posted by RayP on 2009-08-19, 18:50:58 (12.167.136.173)
Hi Douglas, Instead of concentrating on the tubes etc, why not do something quite different and concentrate on the container. I have this vision of an old Ford roadster with tubes as the headlights an .......
396: Tube DIY Asylum, RE: Blumlein Garter Modification - Broskie (0.00)
Posted by RayP on 2009-08-03, 05:16:17 (204.97.106.43)
You may have looked at this already, but in case you haven't, Broskie published an article on his version of the circuit at the link below. ray .......
397: Tube DIY Asylum, RE: disc-seal (0.00)
Posted by RayP on 2009-07-29, 05:39:28 (12.167.136.173)
Thanks. Reading at the data sheet, it certainly looks like it would be difficult to mount. ray .......
398: Tube DIY Asylum, disc-seal (0.00)
Posted by RayP on 2009-07-29, 05:23:24 (12.167.136.173)
Out of curiousity, what is a disc-seal tube? Could you give an example I could look up. ray .......
399: Bottlehead Forum, RE: Looking forward to future meets. (0.00)
Posted by RayP on 2009-07-28, 06:49:41 (204.97.106.57)
You will be most welcome. You might even like to take part in the 6V6 competition. ray .......
400: Bottlehead Forum, Mid Atlantic Bottleneck Meet (0.00)
Posted by RayP on 2009-07-26, 08:29:45 (12.167.136.173)
We had about ten of us turn up to Franks place in lower Pennsylvania. Frank has a recording studio and had one listening area set up there and another area in a lounge room. Since it is summer, we did .......
401: Bottlehead Forum, What time?? (0.00)
Posted by RayP on 2009-07-24, 12:21:09 (12.167.136.173)
What time are we starting? ray .......
402: Bottlehead Forum, RE: Mid Atlantic BH Meet this Saturday (0.00)
Posted by RayP on 2009-07-24, 12:18:42 (12.167.136.173)
Bring the Foremost and we will see what we can see. ray .......
403: Bottlehead Forum, 5894 pp amp (0.00)
Posted by RayP on 2009-07-19, 07:59:11 (12.167.136.173)
Provided it keeps working, I will bring the 5687 / 5894 pp amp that I took to the meet in VA. It took this amp an age to break in and it sounds a lot better now. This morning I installed the Broskie v .......
404: Bottlehead Forum, RE: Mid Atlantic BH Meet this Saturday (0.00)
Posted by RayP on 2009-07-19, 07:50:32 (12.167.136.173)
You will be very welcome. Remember to bring some music that you like. One of the pleasures of coming to a meet like this is being introduced to stuff you have never heard before. ray .......
405: Bottlehead Forum, RE: Saturday, July 25 (0.00)
Posted by RayP on 2009-07-17, 07:40:08 (198.200.181.193)
I would love to hear the various DACs and it's usually helpful to have a Foreplay around. ray .......
406: Bottlehead Forum, RE: Mid Atlantic BH Meet this Saturday (0.00)
Posted by RayP on 2009-07-17, 06:23:39 (198.200.181.193)
Great, I will be there, but just to confirm the meet is the 25th and not this Saturday which is the 18th. ray .......
407: SET Asylum, 829b preamp (0.00)
Posted by RayP on 2009-07-15, 05:54:32 (12.167.136.173)
Could you share more details about the 829B preamp. ray .......
408: Tube DIY Asylum, RE: This SV811-10 is starting to sound more and more... (0.00)
Posted by RayP on 2009-07-13, 13:45:23 (204.97.106.55)
I wouldn't say it was a red herring. When it came out, those who tried it and published something about it seemed to like it. I thought it had possibilities when I listened to my first version but I t .......
409: Tube DIY Asylum, RE: Good OP point and driver for SV811-10? (0.00)
Posted by RayP on 2009-07-13, 07:50:35 (204.97.106.55)
Oddly enough, I have a pair that have been kicking around for a few years and I am currently trying to build an amp with them just for the fun of it and to try out some techniques I haven't used befor .......
410: Tube DIY Asylum, RE: Jumpin Jimminee! what a difference a CCS makes! (0.00)
Posted by RayP on 2009-07-11, 03:47:22 (12.167.136.173)
If you go to this article by Gary Pimm, you will get a good explanation. ray .......
411: Tube DIY Asylum, RE: Using non-inductive resistors as a plate load question (0.00)
Posted by RayP on 2009-07-08, 06:28:37 (12.167.136.173)
Thanks for the answer. My own thinking was along those lines, but it helps to get advice based on considerable experience. By the way, if you don't mind sharing, what brand ww resistor do you use? I w .......
412: Tube DIY Asylum, Using non-inductive resistors as a plate load question (0.00)
Posted by RayP on 2009-07-08, 05:55:16 (12.167.136.173)
I was looking at one of the reponses to the Schottky cathode bias thread below and realized that I still haven't worked out an answer to a question that has bothered me for a while. The recommendation .......
413: Tube DIY Asylum, dual DPDT (0.00)
Posted by RayP on 2009-07-05, 05:39:55 (12.167.136.173)
I have used the following method for years which uses two DPDT switches and it works well for me. Note the caveat about power outages. Hope it helps, ray .......
414: Tube DIY Asylum, Thanks for the answers (0.00)
Posted by RayP on 2009-06-28, 08:32:52 (12.167.136.173)
It makes sense now, ray .......
415: Tube DIY Asylum, PSUD - current tap (0.00)
Posted by RayP on 2009-06-28, 06:14:56 (12.167.136.173)
Out of curiousity, what is the purpose of a 'current tap' in PSUD as opposed to the usual C, RC and LC filters. Is it some kind of shunt regulator? ray .......
416: Tube DIY Asylum, Weight? (0.00)
Posted by RayP on 2009-06-28, 04:49:50 (12.167.136.173)
I can still remember needing two people to carry some of your amps into the meets in Elkton. Are these one, two or even three people amps? Hopefully I will get to hear them at some stage. ray ::: TOPI .......
417: High Efficiency Speaker Asylum, RE: two questions :-) (0.00)
Posted by RayP on 2009-06-23, 04:59:08 (160.253.103.187)
Hi Mark, I'm still using an array (12 per side) of these in an open baffle (with some inexpensive tweeters on top) and I still love them. For me they work. Even the single in the box that you loaned m .......
418: Bottlehead Forum, Viagra (0.00)
Posted by RayP on 2009-06-19, 16:21:43 (76.98.253.237)
So is ViagraDac the name we were looking for? ray .......
419: Bottlehead Forum, RE: filter chokes on ground side (0.00)
Posted by RayP on 2009-06-15, 05:09:53 (204.97.106.42)
This subject was thoroughly raked and harrowed over on tubediy about a year ago. See link below: One of the more interesting posts came from Dave Cigna with the subject line 'Right'. ray .......
420: Bottlehead Forum, RE: He Might Need More (0.00)
Posted by RayP on 2009-06-04, 05:56:58 (204.97.106.65)
I would hope we are not seen as a daunting group since we really try to make everybody feel welcome. Over the years we have had quite a number of people come who have not built anything or have been j .......
421: Tube DIY Asylum, RE: The credit is not mine - Pete Millet (0.00)
Posted by RayP on 2009-06-03, 04:50:02 (204.97.106.57)
I believe Pete is the one who first posted and many thanks to him. ray .......
422: Bottlehead Forum, RE: bottleheads around here - MD (0.00)
Posted by RayP on 2009-06-02, 05:09:41 (204.97.106.57)
You are in luck. Take a look at http://www.audioasylum.com/forums/bottlehead/messages/13/136228.html and the link below. The meet is just off I-83 just north of the MD / PA border on July 25. ray ::: .......
423: Bottlehead Forum, 6V6 competition (0.00)
Posted by RayP on 2009-05-28, 04:02:51 (12.167.136.162)
We might hold a discussion about how we audition the amps in our 6V6 competition. I would like to keep the building rules unchanged. Over the years that we have been meeting, it has become apparent to .......
424: Bottlehead Forum, date? (0.00)
Posted by RayP on 2009-05-23, 14:05:06 (121.210.208.149)
Have you picked a date yet? If not, just pick one and let us know. ray .......
425: Bottlehead Forum, RE: Maybe have a bunch of "regionals" and recommend 3 for RMAF? (0.00)
Posted by RayP on 2009-05-12, 19:37:22 (121.218.81.194)
Not a bad idea. We will talk about it at our next meet which looks like will be in July. ray .......
426: Bottlehead Forum, Stirling, VA (0.00)
Posted by RayP on 2009-05-12, 19:36:00 (121.218.81.194)
It's just north of Dulles Airport by a couple of miles. ray .......
427: Bottlehead Forum, RE: Summer Meet.Mid-Atlantic Bottleheads (0.00)
Posted by RayP on 2009-05-12, 19:34:02 (121.218.81.194)
Greetings from Narooma in Australia where I am currently on holiday. This place is absolutely beautiful. I believe any of those days will work for me and thanks for volunteering. ray .......
428: Bottlehead Forum, RE: Have you considered make this part of the 2010 RMAF? (0.00)
Posted by RayP on 2009-05-10, 19:01:04 (138.130.101.169)
No, we hadn't thought of RMAF. I've never been to RMAF (it's usually at a time that doesn't fit in with my work schedule), but it could be an idea that RMAF could pick up on. ray .......
429: Bottlehead Forum, O/T - Keith Richards on the blues (0.00)
Posted by RayP on 2009-05-01, 04:34:23 (12.167.136.162)
There is an interesting article on the Guardian web site where Keith Richards talks about the Stones' early days of investigating and learning how to play the blues along with some of the recording is .......
430: Bottlehead Forum, RE: Shipping (0.00)
Posted by RayP on 2009-04-28, 04:29:49 (204.97.106.73)
I have been exchanging a few emails with the Dowdy Lama who has been very helpful in suggestions for the rules. One suggestion from him is to allow for out of town entrants who supply return postage. .......
431: Bottlehead Forum, RE: parts not discontinued... (0.00)
Posted by RayP on 2009-04-22, 08:24:05 (12.167.136.162)
It just shows how hard it is to make up rules that cover every possibility. We are now setting up our committee to come to some agreement on the rules. I will add this issue to those to be discussed. .......
432: Bottlehead Forum, RE: Yay for camels (0.00)
Posted by RayP on 2009-04-21, 08:33:59 (204.97.106.79)
Since our deadline for having the amp ready is April next year, I think it will be a while before anybody really starts building. I would suggest that the little committee considers the following: 1 - .......
433: Bottlehead Forum, the camel is here - let's discuss the vendor issue (0.00)
Posted by RayP on 2009-04-21, 05:14:52 (204.97.106.79)
So the camel is here and wants to poke his nose into the tent. We have a decision to make from 3 alternatives: 1 we stay with the initial list of vendors 2 we allow any vendor with a verifiable price .......
434: Bottlehead Forum, RE: Rules questions (0.00)
Posted by RayP on 2009-04-20, 14:57:42 (204.97.106.79)
I would prefer to limit the vendors to those already specified because if we open it up we will have to open it up to even still more vendors. It's like the camel sticking its nose in the tent. If I r .......
435: Bottlehead Forum, fun experimentation (0.00)
Posted by RayP on 2009-04-20, 08:53:56 (204.97.106.79)
It really is an interesting challenge because the $150 takes you out of your comfort zone. I'm trying to come up with a design where I try to use techniques that I either haven't used before or have l .......
436: Bottlehead Forum, some minor rule changes followup and a question (0.00)
Posted by RayP on 2009-04-20, 05:50:36 (204.97.106.79)
It just shows that no matter how clear you think you have made the rules, there is always room for improvement. Thanks for pointing out where I should have been more precise. Yes, the intention is to .......
437: Bottlehead Forum, some minor rule changes (0.00)
Posted by RayP on 2009-04-19, 18:05:49 (12.167.136.162)
I've received a few suggestions and there has been more time to think about the rules. Rule 2 now indicates not to include postage in the $150. Solder should not be included either. Rule 5 limits plat .......
438: Bottlehead Forum, RE: Clarifications (0.00)
Posted by RayP on 2009-04-19, 04:48:05 (12.167.136.162)
The cost of the board would be whatever it costs to get it from Bottlehead. If you know the circuit or wanted to have a different ccs, you would need to point-to-point it. As Natural Sound suggests, t .......
439: Bottlehead Forum, Md,Va,Dc, Bottleneck meet photos and 6V6 Amp Project (0.00)
Posted by RayP on 2009-04-18, 19:42:19 (12.167.136.162)
I have posted the photos at the URL below. If I missed anything or got something wrong, let me know. http://829b.com/B_2009_04.aspx In addition, the rules for the 6V6 competition are at http://829b.co .......
440: Bottlehead Forum, mid atlantic Bottlehead 6V6 Amp Project (0.00)
Posted by RayP on 2009-04-16, 17:20:53 (12.167.136.162)
It's a bit of a puzzle to decide what to call ourselves since we float between Virgina and Delaware with attendees from as far south as near Dulles to upper NJ near New York. Our original meeting plac .......
441: Tube DIY Asylum, RE: Bottlehead Stuff (0.00)
Posted by RayP on 2009-04-13, 05:43:30 (204.97.106.59)
I suspect there are quite a few of us who participate in or lurk at this forum who got their feet wet with Bottlehead gear. I started with the original $99 Foreplay. It actually worked first time. If .......
442: Bottlehead Forum, RE: Md,Va,Dc, mid atlantic Bottlehead meet (0.00)
Posted by RayP on 2009-04-13, 05:25:56 (204.97.106.59)
Hi Frank, Thanks very much for volunteering, it's always interesting to go to a different venue. Since this thread is well and truly buried by now, we would probably get greater response if we started .......
443: Tube DIY Asylum, thanks (0.00)
Posted by RayP on 2009-04-09, 07:33:43 (12.167.136.162)
Thanks for the detailed response ray .......
444: Tube DIY Asylum, toroid (0.00)
Posted by RayP on 2009-04-09, 05:34:19 (12.167.136.162)
That was interesting about wiring the toroid. I have a couple of questions. Since most toroids I know of are 115+115 for the primary, can you wire them in series to get the 230? Or do you need a singl .......
445: Bottlehead Forum, RE: Md,Va,Dc, mid atlantic Bottlehead meet (0.00)
Posted by RayP on 2009-04-09, 05:17:34 (12.167.136.162)
Unfortunately, the library isn't available. It's a long story involving the need to get additional staff and office space. We talked a little about trying to have a meet in the Baltimore area in summe .......
446: Bottlehead Forum, upside down (0.00)
Posted by RayP on 2009-04-06, 07:42:47 (204.97.106.64)
I believe the lesson was - never have one speaker upside down so that you mistake the woofer connection for the tweeter. ray .......
447: Bottlehead Forum, Md,Va,Dc, mid atlantic Bottlehead meet (0.00)
Posted by RayP on 2009-04-06, 05:22:48 (204.97.106.64)
Thanks to Steve for hosting and especially for the new bay window in the listening room. It made the room much more open and was a great place to put equipment temporarily. We only had 6 people but we .......
448: Bottlehead Forum, speakers (0.00)
Posted by RayP on 2009-04-04, 05:11:26 (12.167.136.162)
We've had all sorts of speakers turn up over the years. Since some of the amps are Bottlehead amps, the speakers are usually in the 92 - 96 db range. As you would expect, Fostex is a common driver. I .......
449: Bottlehead Forum, Tannoys (0.00)
Posted by RayP on 2009-04-03, 17:33:27 (12.167.136.162)
Could you elaborate on the cabinets for the Tannoys. Any particular design? ray .......
450: Bottlehead Forum, under $100 (0.00)
Posted by RayP on 2009-04-03, 11:08:37 (12.167.136.162)
Why not pose the question over on the Tubediy forum about building an under $100 amp. It will give them something to think about. Of course they will need to know what power you think would be desirab .......
451: Bottlehead Forum, you can use Line Matching Transformers (0.00)
Posted by RayP on 2009-04-03, 05:06:31 (12.167.136.162)
I've been using the old Radio Shack transformers for years now. I seem to remember an article written by Paul Joppa that measured them and the bass was their weakest area. They used to cost well under .......
452: Bottlehead Forum, stuff I am bringing (0.00)
Posted by RayP on 2009-03-29, 07:53:20 (12.167.136.162)
John Swenson transconductance linestage using the Gary Pimm CCS boards - no tubes but see link below. Push-pull 5894 amp (a work in progress) I'll probably give the 829B lightbulb amp an outing. No ch .......
453: Bottlehead Forum, Bottleneck meeting in Stirling, VA (0.00)
Posted by RayP on 2009-03-23, 05:47:07 (204.97.106.72)
Who cares about Williamsburg when there is a Bottleneck meet to attend in Stirling, VA (near Dulles airport) on Sunday, April 5. Send them there! Years ago, I took my father (an Aussie like me) to Wil .......
454: Bottlehead Forum, legality (0.00)
Posted by RayP on 2009-03-20, 17:12:33 (68.81.63.215)
A web site that discusses the legality of distilling your own. ray .......
455: Bottlehead Forum, RE: OT - evaporative still (0.00)
Posted by RayP on 2009-03-20, 16:24:18 (68.81.63.215)
Have you tried the evaporative still process? I've been thinking about trying it sometime but I'm not really a gin or vodka drinker. Cognac, bourbon and a single malt whisky on a rainy evening are my .......
456: Tube DIY Asylum, RE: and holy macaroni... (0.00)
Posted by RayP on 2009-03-10, 08:28:20 (204.97.106.218)
$14 sure looks a lot better for the 31JS6C. ray .......
457: Tube DIY Asylum, RE: more exotic (0.00)
Posted by RayP on 2009-03-09, 16:40:31 (66.16.122.78)
G'day Doug, I was hoping you would suggest something interesting. I've tried to find a datasheet for a 6GJ6 but can't find anything. Would you have a link? ray .......
458: Tube DIY Asylum, more exotic (0.00)
Posted by RayP on 2009-03-09, 05:48:19 (204.97.106.232)
You might consider the 829B with its two pins poking out of the top. I was given a bunch of tubes a few years back with two of these tubes and I knew I had to do something with them. They require a 7 .......
459: Tube DIY Asylum, next time (0.00)
Posted by RayP on 2009-03-03, 17:16:10 (12.167.136.162)
Next time, get him to build an amp himself. Its both educational and (I hate this word) bonding. A couple of years ago, when I thought my daughter was going to go University of Delaware, I bought all .......
460: Tube DIY Asylum, RE: advantage of the reverse wiring (0.00)
Posted by RayP on 2009-02-27, 17:56:45 (12.167.136.162)
Thanks for the explanation, ray .......
461: Tube DIY Asylum, advantage of the reverse wiring (0.00)
Posted by RayP on 2009-02-27, 05:35:10 (204.97.106.75)
I presume the advantages of interleaves and different wire guages are the same as for a regular transformer. What is the advantage of the reverse wiring? ray .......
462: SET Asylum, Where do you live? (0.00)
Posted by RayP on 2009-02-24, 16:05:33 (12.167.136.162)
There is always a chance that somebody who lurks on this forum and has an SE amp may live close to you and would love to hear your speakers. ray .......
463: High Efficiency Speaker Asylum, cork 12 x 36 (0.00)
Posted by RayP on 2009-02-21, 05:07:24 (12.167.136.162)
McMaster carries 12 x 36 cork sheets. I presume you could cut it to size. Scroll down to bottom of page. ray .......
464: SET Asylum, Peter Breuninger (0.00)
Posted by RayP on 2009-02-14, 04:32:33 (12.167.136.162)
I had read about SET in S'phile back in the 90's. At the time, I would occasionally go to the monthly meets that Peter Breuninger used to hold in his house (gorgeous listening room) in Philadelphia. O .......
465: Bottlehead Forum, OK - Sunday April 5 (0.00)
Posted by RayP on 2009-02-13, 16:29:27 (12.167.136.162)
It's possible that randallvw might turn up as well. ray .......
466: Bottlehead Forum, Either day works for me. (0.00)
Posted by RayP on 2009-02-13, 05:38:22 (204.97.106.98)
I prefer the Saturday (4), but the Sunday(5) also works. ray .......
467: Bottlehead Forum, RE: Sterling Bottleneck meet. (0.00)
Posted by RayP on 2009-02-12, 17:56:11 (12.167.136.162)
Sunday 29 does not work for me. ray .......
468: Bottlehead Forum, OK with March 22 (0.00)
Posted by RayP on 2009-02-07, 05:09:20 (12.167.136.162)
That date should give us enough time to finish up some projects. ray .......
469: Tube DIY Asylum, Stirling VA Bottleneck meet in March (0.00)
Posted by RayP on 2009-02-06, 06:19:09 (198.200.181.206)
By the way, we are starting to set up a Bottleneck meeting in March. I believe Steve is going to use the LE14As in an econowave setup. ray .......
470: Bottlehead Forum, load of stuff (0.00)
Posted by RayP on 2009-02-06, 06:16:08 (198.200.181.206)
Looks like you have been busy. I'll be very interested to hear the DAC. ray .......
471: Bottlehead Forum, a little different (0.00)
Posted by RayP on 2009-02-06, 04:41:03 (12.167.136.162)
Somehow I get the feeling we won't need to bring a lot of watts. To be honest, I would prefer Saturday 14th March because I would like to go to another event in Rockville later in the day. I can come .......
472: Tube DIY Asylum, Start your own (0.00)
Posted by RayP on 2009-02-05, 05:08:19 (204.97.106.28)
Doug (PakProtector) and I started a group (thru the Bottlehead website) a number of years ago that meets in the Delaware, Maryland, DC and Virginia area. For a while we used to meet in a meeting room .......
473: Tube DIY Asylum, link for the KOA Speers. (0.00)
Posted by RayP on 2009-02-01, 05:42:39 (76.98.252.204)
The 1 watt and above Koa carbon films are a little tricky to find on the Mouser site sometimes. Here is a link. By the way, I also use the low powered Koas as well. ray ray .......
474: SET Asylum, Dia (0.00)
Posted by RayP on 2009-01-29, 09:52:01 (204.97.106.71)
Thanks for the tip. ray .......
475: SET Asylum, the Pete Millet turret / pcb method (0.00)
Posted by RayP on 2009-01-29, 06:49:38 (204.97.106.71)
This does not exactly answer your question but I've tried Pete's method of point to point with turrets on a pcb as ground plane and I like it. His stuff still looks a lot better than mine, however. I' .......
476: Tube DIY Asylum, parallel DN2540 (0.00)
Posted by RayP on 2008-12-24, 05:07:44 (12.167.136.162)
Interesting idea about paralelling. Are there any precautions to be taken? ray .......
477: Tube DIY Asylum, Pete Millett's site (0.00)
Posted by RayP on 2008-12-13, 05:30:03 (12.167.136.162)
Take a look at Pete Millett's site where he has a number of projects. In particular, look at his technique of using a printed circuit board as the ground plane and using turrets to attach the componen .......
478: Tube DIY Asylum, RE: Get some KOA Speer carbon film resistors from Mouser and be done with it. (0.00)
Posted by RayP on 2008-12-01, 12:30:29 (204.97.106.72)
Mouser has some 1 and 2 watt versions - listed under Koa / power resistors. ray .......
479: Bottlehead Forum, what is blueing (0.00)
Posted by RayP on 2008-11-27, 06:07:28 (76.125.196.177)
Since I am one of those who isn't much into looks, I haven't come across blueing before. I am curious as to what is blueing, how do you do it, and why do you do it? ray .......
480: SET Asylum, where do you live? (0.00)
Posted by RayP on 2008-11-15, 14:07:50 (12.167.136.162)
If you tell us where you live, then there is a good chance somebody will be able to help you. One of the advantages of buying a kit is that you can learn lessons about good layout and safe practice. E .......
481: Bottlehead Forum, RE: Opinion on the Aikido? nt (0.00)
Posted by RayP on 2008-11-12, 05:37:39 (204.97.106.63)
As I remember, it belonged to Joel and for some reason or other, there was no volume control on it so it was mainly being used to amplify the low level signal. At the time we were swapping items and s .......
482: Bottlehead Forum, Photos from Bottleneck meeting in Newark, DE (0.00)
Posted by RayP on 2008-11-06, 09:09:14 (12.167.136.162)
Below is the link to the photos. Note that there is a link to photos that Frank took. Again, thanks to Fritz for hosting. ray .......
483: Bottlehead Forum, RE: Finished the "All at once" package.. (0.00)
Posted by RayP on 2008-11-06, 05:34:36 (12.167.136.162)
And you were wondering whether you should host a meeting. Go ahead, I think we would all like to hear how it sounds. The back wall has me curious. Is it special treatment? ray .......
484: SET Asylum, non music (0.00)
Posted by RayP on 2008-11-04, 11:58:44 (204.97.106.62)
If I had known your dad wanted more classical music, I would have been glad to oblige. I'm glad you made the trip. ray .......
485: Bottlehead Forum, photos later this week (0.00)
Posted by RayP on 2008-11-04, 05:30:06 (160.253.103.187)
I'll post photos later this week and let the group know. ray .......
486: Bottlehead Forum, hosting (0.00)
Posted by RayP on 2008-11-02, 18:34:26 (12.167.136.162)
Not everybody has a good listening room but if yours is at least half way decent, go ahead and host. It helps to have a reasonably large room with space for about a dozen or so people along with space .......
487: Bottlehead Forum, RE: Saturdays Bottleneck meet (0.00)
Posted by RayP on 2008-11-02, 18:22:41 (12.167.136.162)
It was great to see the familiar faces and of course, the new ones. I'll post some photos in a couple of days. We had a lot of gear to listen to and it still amazes me that although amps and speakers .......
488: SET Asylum, getting out of the rut (0.00)
Posted by RayP on 2008-10-26, 16:50:31 (12.167.136.162)
Now that sounds interesting and I need to do something a bit different. Let's come up with something for me to build. Is there a neat way of getting the 33 volt AC? Was also looking at the url below. .......
489: Bottlehead Forum, 10 years on (0.00)
Posted by RayP on 2008-10-26, 06:37:37 (12.167.136.162)
As I wrote the posting below about the Bottleneck meet, I realized that I built my Foreplay 10 years ago this month (and it still works). It's been a great hobby for me over the 10 years, reading abou .......
490: SET Asylum, MD/VA/DC/DE Bottleneck meet - November 1 (0.00)
Posted by RayP on 2008-10-26, 06:24:59 (12.167.136.162)
I know some of you who have attended the Bottlehead meets post to this forum. In case you miss the reminder on the Bottlehead forum, we are doing a meet on November 1 at Fritz's place in Newark, DE. D .......
491: Bottlehead Forum, MD/VA/DC/DE Bottleneck meet - November 1 (0.00)
Posted by RayP on 2008-10-26, 06:22:05 (12.167.136.162)
Just a reminder that we will be meeting at 11am at Fritz's place in Newark, DE. All are welcome and bring plenty of music (and gear if you wish). Email me for directions. ray A preliminary list of equ .......
492: High Efficiency Speaker Asylum, Edge simulator (0.00)
Posted by RayP on 2008-10-23, 06:02:43 (204.97.106.73)
You might find the Edge simulator helpful. ray .......
493: Bottlehead Forum, Motor skills (0.00)
Posted by RayP on 2008-10-10, 18:05:38 (12.167.136.162)
My daughter built an amp and made a much neater job than what I could ever do. She inherited the desirable fine motor skills from her mother who I suspect could do a wonderful job of building a kit. Q .......
494: Bottlehead Forum, RE: A Sad Day For Us Geezers, RIP Nick Reynolds (0.00)
Posted by RayP on 2008-10-02, 19:52:44 (12.167.136.162)
Back in the mid 80's, I happened to be going down in a hotel elevator in Louisville and the Kingston Trio were in there ready to go out to perform at a pre Derby concert. They talked briefly to us and .......
495: Bottlehead Forum, Tang Band W6-789S 6-1/2" Woofer (0.00)
Posted by RayP on 2008-09-30, 15:24:00 (12.167.136.162)
Is this the speaker, if so, it looks interesting. As one stage I was thinking of doing 4 per side and a suitable tweeter, but I came to my senses and considered my poor wife. ray .......
496: Bottlehead Forum, so what are the speakers and amps? (0.00)
Posted by RayP on 2008-09-30, 10:11:28 (204.97.106.89)
I'm trying to put together a list of stuff that people are bringing. And yes, Doug plans to be there. ray .......
497: Bottlehead Forum, Change of date - November 1 (0.00)
Posted by RayP on 2008-09-30, 05:56:43 (204.97.106.89)
Doug Piccard asked if we could postpone the meet to November 1. Since Doug is the cofounder of our group, I checked with Fritz and Nov 1 works for him so we are changing the date. I appologize to any .......
498: SET Asylum, Change of date - November 1 (0.00)
Posted by RayP on 2008-09-30, 05:53:56 (204.97.106.89)
Since Doug is the cofounder of our group, I checked with Fritz and Nov 1 works for him so we are changing the date. I appologize to any who can't make it on the new date. ray .......
499: SET Asylum, MD/VA/DC/DE Bottleneck meet -October 25 (0.00)
Posted by RayP on 2008-09-29, 12:23:46 (204.97.106.89)
I know some of you who have attended the Bottlehead meets post to this forum. In case you miss it on the Bottlehead forum, we are doing a meet on October 25 at Fritz's place in Newark, DE. Details at .......
500: Bottlehead Forum, MD/VA/DC/DE Bottleneck meet -Oct 25 (0.00)
Posted by RayP on 2008-09-29, 12:18:38 (204.97.106.89)
Just a reminder that we are meeting at Fritz's place in Newark, DE on October 25. We will be starting about 11am. If you need directions, send me an email. As usual, all are welcome and please bring a .......
Found total of 500 records, Query: , Author: RayP in All Forums, Time: 1 sec.