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1: Some new Magnequest transformers (B7 and TL404). (7.81)
Posted by FrancescoM on 2020-04-19, 02:43:28 (93.146.46.69)
Dear All, I'm looking for some magnequest transformers. Various B7 (5k, 10k, 15K) and TL404. I sent an email to Michael, without a reply from him. So I'm looking also to pre-owned B7 and tl404. Thank .......
2: Pretty much what my Royal is.... (7.81)
Posted by Gordon Rankin on 2009-09-16, 05:59:59 (66.161.253.120)
Chris, My Royal Preamplifier is almost exactly your design sans the TL404. I use a 6V4 rectifier and a custom loading choke and a custom inverting MQ 10K:10K transformer. But I use the P&G volume cont .......
3: TL404 (6.72)
Posted by Frank Mena on 2013-01-23, 12:59:20 (70.27.120.71)
Just thinking out loud...... but if Doc.B ever put out a limited high-end headphone amp kit like the one below using the TL404 (see link) I'm sure they would sell like hotcakes. That way Mike could al .......
4: Big Electron, packed house in the headphone amplifier (6.54)
Posted by Gordon Rankin on 2013-05-23, 09:55:13 (72.49.109.51)
Gang, I have been doing a ton of development lately and this was a nice diversion. Though like anything was a lot of work. This is a TL404 based 45 directly heated triode (AC filaments) with a choke l .......
5: RE: Dowdy choke for an headphone/preamplifier. (5.55)
Posted by FrancescoM on 2016-07-07, 14:24:55 (93.39.143.84)
Some times ago my friend measured the primary inductance of your tl404. He found about 27H. So the anode choke and primary of the tl404 are in series in a parafeed design. The total inductance isn't a .......
6: when? (5.55)
Posted by gluca on 2014-11-11, 13:33:09 (2.36.207.1)
when a nickel core TL404? .......
7: TL404 for sale (4.81)
Posted by gluca on 2013-01-20, 10:39:57 (188.216.115.123)
So I have this pair of TL404's and they are from the first batch made by Mike missing the 10 and 4 ohm taps (see the original post by Mike). I dismantled my DAC and they have been sitting in my parts .......
8: RE: Gorgeous work as usual. (4.80)
Posted by AnandR on 2007-07-14, 17:59:38 (65.43.219.9)
Colonel Sanders, I need to drop by your place for some crispy chicken. Sorry couldn't resist. Yes...I did use the TL404 which has a 5K primary impedance and is an autoformer. Originally with the 6C45 .......
9: Ohhh? TL404? (4.77)
Posted by pistoljoe on 2006-01-29, 09:40:16 (71.115.45.218)
Tell me more, didnt know this was available again. cores? cost? thanks, Joe .......
10: RE: Teaser Post (4.67)
Posted by gluca on 2015-02-17, 10:08:21 (2.36.195.15)
I WANT A TL404 WITH NICKEL LAMS!!! AH! .......
11: I second TL404 request (4.67)
Posted by mwiebe on 2011-11-22, 15:00:22 (75.173.1.173)
Mike, I'm also interested in TL-404 versions. Matt .......
12: RE: MQ iron for sale (4.58)
Posted by m17xr2b on 2023-03-13, 10:32:36 (84.18.253.110)
Hi Xavier, I've emailed you for a pair of TL404. .......
13: TL404 are they available? (4.58)
Posted by xcortes on 2009-08-14, 12:22:16 (207.83.200.207)
I just got a pair of Lowther drivers and would like to try John Swenson's high impedance concept .......
14: RE: TL404 are they available? (4.53)
Posted by braubeat on 2009-08-16, 08:34:51 (72.197.89.234)
Mike I would like to grab a pair too if you still have some. Thanks Mike .......
15: Any TL404's in stock (4.50)
Posted by OldNuke on 2016-05-02, 20:59:14 (108.193.1.40)
Hi Mike, Wouldn't happen to have a pair of TL-404's laying around would you? Alonzo .......
16: Re: Ohhh? TL404? (4.49)
Posted by mqracing on 2006-01-29, 10:19:47 (141.151.58.4)
Hi Joe: core mat is M5 goss. cost is $500 a pair. msl .......
17: RE: My new project. And thanks to Mike and Keto! (4.45)
Posted by gluca on 2010-01-01, 08:57:53 (82.59.226.100)
Where did you find the TL404? Old stock or by Mike MQ? .......
18: Get well soon Mikey... (4.42)
Posted by AnandR on 2004-06-29, 14:52:56 (199.33.173.1)
Dear Mikey, My heart goes out to you. Please get well soon. We need you to wind more TL404's for friends of mine! Anand. .......
19: RE: TL-404 suitability in Gordon's Bugle (4.39)
Posted by Caucasian Blackplate on 2009-09-08, 00:09:32 (98.232.6.35)
The 1k can stay, the 100k certainly goes. In that schematic, there is another huge advantage to using something like the EXO-45 over the TL404. You can connect the primary of the parallel feed output .......
20: TL404 (4.33)
Posted by gluca on 2011-11-22, 14:54:00 (93.71.86.164)
I have your last pair ... any chance you are winding more of them with some nickel or silver? they are so yummy ... that would be the time I finally buy a silver transformer. .......
21: RE: Any TL404's in stock (4.29)
Posted by mqracing on 2016-05-03, 02:22:39 (172.56.29.149)
I do. I have two or three pairs of TL-404XL's in stock. Feel free to email me at acrosound@aol.com MSL .......
22: Any interest in a pair of MQ TL404's? (4.29)
Posted by AnandR on 2007-12-05, 15:34:57 (65.43.219.29)
E-mail me if interested. I hate to see these go, nearly brand new only about 10-20 hours so not even broken in. Need the cash for the holidays. Best, Anand. .......
23: RE: Dowdy choke for an headphone/preamplifier. (4.29)
Posted by FrancescoM on 2016-07-07, 13:59:09 (93.39.138.123)
Hi Michael, The output transformer is your TL404, standard version. The I on the plate of the tube could be between 35-40mA. Thank you for your reply .......
24: RE: TFA-2004 cobalt in a JFL Horus (4.29)
Posted by gluca on 2011-12-11, 04:08:08 (109.115.170.87)
HUM! All I need for xmas is a cobalt and silver TL404! a pic??! I like audio-porno. .......
25: RE: TL404 are they available? (4.26)
Posted by mqracing on 2009-08-17, 13:22:40 (151.197.207.8)
Hi Mike: I only have one pair available at this time. If you want these please contact me via email at acrosound at aol dot com or call me at 215 288 4816. Mike .......
26: Posting designs with unobtainium parts like the TL404 is NOT ok... (4.23)
Posted by Bas Horneman on 2011-02-05, 16:37:36 (84.107.197.14)
thanks Gianluca. Just kidding. What would one call such a setup? Choke assisted srpp? Kind regards, Bas .......
27: RE: TL404 are they available? (4.19)
Posted by mqracing on 2009-08-14, 12:28:41 (141.151.89.105)
Hi Javier: Apologies... I got your email... and, as usual, I am a wee bit tardy in getting back to you. I have put a temp hold/reserve on a pair for you. If you get these I will be down to my LAST pa .......
28: Not so unobtainium (4.16)
Posted by DanK tubes on 2011-02-05, 17:26:19 (74.220.74.160)
Hey Bas, There's been a pair of TL404 autoformers for sale on the Audio Asylum classifieds for a month or so. They are calling my name, but I just have too many other projects in the works. If I was m .......
29: Would someone please stop that guy??? (4.14)
Posted by gluca on 2010-03-03, 15:37:14 (72.49.122.84)
How ugly is the TL404? :-) Me got very last pair, me happy. More comments later, me is in a hurry ... me going dinner friends place. Me says it sounds very good. .......
30: RE: TL404 are they available? (4.03)
Posted by chrismercurio on 2009-08-17, 12:10:37 (99.4.72.198)
Mike, Does that mean you won't make anymore? Or you would have to receive a large order to be motivated to make them? I was thinking single stage DHT headphone amp/preamp/integrated with 71a in the ou .......
31: RE: Searching for Mike, need some new stuff (4.00)
Posted by Gordon Rankin on 2020-04-03, 09:56:47 (74.215.255.128)
ON, Mike doesn't have any TL404 left. I have 4 pairs here unused. I might consider selling one pair as I have an idea for a WE101 headphone/preamp kind of thingy. Thanks, Gordon .......
32: Autoformers (3.99)
Posted by OldNuke on 2016-11-30, 19:05:55 (108.193.1.40)
Mike, Are the TL404's the only autoformer you make? I was thinking of an experiment with some Maggies and monoblock tube amps. Might be a dumb idea but I thought I'd ask. Do you have an autoformer tha .......
33: RE: Posting designs with unobtainium parts like the TL404 is NOT ok... (3.96)
Posted by mqracing on 2011-02-06, 10:39:35 (96.227.165.79)
Hi Bas. I'm hoping to do another batch of the TL-404's in the next few months. I'd like to look into getting some high perm cores for this guy as an option to the silicon iron cores that we've built w .......
34: RE: Some new Magnequest transformers (B7 and TL404). (3.94)
Posted by glenz10183@aol.com on 2020-04-19, 09:17:44 (74.108.113.91)
Hello Francesco, I have some brand new B7/10K primary/500 ohm secondary with brass channel frames and hi nickel(their best model). Contact me at glenz10183@aol -George .......
35: Re: Cost of custom wound transformers (3.84)
Posted by Mossback on 2006-12-29, 00:41:25 (130.76.32.144)
The custom headamp-preamp Gary builds with Mike’s Peerless TL404’s or the Bottlehead SEX amp with Mike’s special iron betters any MOSFET or gainclone type amp I have heard. .......
36: RE: TL 404 run? (3.79)
Posted by Frank Mena on 2014-06-27, 13:12:52 (70.27.123.25)
The photo does not show up in the link below anymore but at least Doc B's description of the early version is there in the link. .......
37: RE: Pretty much what my Royal is.... (3.65)
Posted by Gordon Rankin on 2009-09-17, 05:42:50 (216.196.208.131)
Chris, I would not rule out the TL404 for a buffer. Either way, if you use the B7 or the TL it's still a buffer as it would not have any gain. This really does not matter what voltage you run it at it .......
38: Dowdy choke for an headphone/preamplifier. (3.63)
Posted by FrancescoM on 2016-07-06, 02:01:07 (130.192.181.149)
Hi Michael and all, i'm ready to use a tl404 that i bought one year ago. I found some VT52 WE.... I need a wonderful plate choke, the best for a VT52, with the highest inductance value. Your best prop .......
39: RE: Very nice! (3.52)
Posted by AnandR on 2007-07-14, 18:02:43 (65.43.219.9)
Ed, The WE437a? Gotta give you credit man, I can't even think about affording the tube, well...maybe, but then I'd ask myself why I didn't purchase some nice NOS 845's for nearly the same price! I kno .......
40: RE: SET Headphone amp (3.52)
Posted by Gordon Rankin on 2016-08-03, 14:33:47 (74.215.187.197)
ON, I have built a number of these for customers using the TL404, Dowdy Choke and tube rectifier. I use AC heaters with the 45 and use a 10 or 20 turn hum pot and was able to make the AC noise less th .......
41: more ... (3.34)
Posted by gluca on 2011-02-06, 09:26:49 (208.102.120.81)
i rewired the little thing as a SRPP (output from the upper cathode) and probably with TL404 that is a good and wise choice: this is true with any other output transformer given the highish Rp of .......
42: RE: TL404 are they available? (3.14)
Posted by mqracing on 2009-08-17, 13:28:06 (151.197.207.8)
Hi Chris: If Mike (who posted earlier) doesn't take my last pair you will be next in line. Please shoot me an email and I will email you back and let you know if this last pair will be available or no .......
43: RE: Plate Choke with tfa-2004 footprint? (3.10)
Posted by Paul Joppa on 2009-08-07, 19:28:41 (24.18.227.0)
Mike has made some called the "BPC" which look just like a TFA-204. They are sonic beauties, with internal features to match the TFAs. I had a pair with nickel TFA2004s for a while, but that amp went .......
44: RE: Poseidons Voice Reference Preamp Eye candy (3.05)
Posted by AnandR on 2007-07-10, 09:04:01 (192.35.79.70)
Hi! Yes, I use the copper clad bus as grounding for each channel. IAG makes these boards, and they are excellent for point to point wiring. I designed it first as a headphone amplifier with Gary Dahl .......
45: Re: costs (2.97)
Posted by AnandR on 2005-03-15, 17:33:24 (141.149.250.39)
Take a Hammond, open it up and note down what you see. Do the same thing to a Magnequest trannie (of course your warranty will be gone). The difference in quality is very easy to see. In fact the diff .......
46: RE: TL-404 is an autoformer (2.77)
Posted by mwiebe on 2009-09-15, 19:24:13 (75.161.84.28)
Chris, That is not the schematic symbol for an autoformer, use the symbol of a choke if you have it. It's important to get it right visually because it reminds you there is no isolation of any kind in .......
47: RE: SET Headphone amp (2.57)
Posted by OldNuke on 2016-08-08, 01:39:34 (108.193.1.40)
Latest steps: increased last power supply capacitor to 82uF (all I had in the junk box). Changed out the pot and padded the input. Moved TL404, headphone jack and RCA grounds to the same point. Moved .......
48: RE: PJ, Could these particular autoformers.... (2.56)
Posted by Paul Joppa on 2007-12-08, 13:43:55 (24.18.240.124)
They are 5K impedance, so well suited to a 45. The Paramour / shunt reg 45 would have the following significant issues: 1) This particular circuit was designed around a 3K impedance, so with 5K the po .......
49: answers (2.53)
Posted by gluca on 2011-05-11, 19:17:38 (74.83.201.95)
Now I'll tell you a secret. I have been in the audio hobby for not a long time but I have my own secrets and this is one of the most private to me. That carton is not a generic carton because I take c .......
50: More data and info (2.38)
Posted by gluca on 2006-10-24, 14:14:26 (81.208.106.79)
Thanks Paul for the hints. I wired a LL1660PP (ungapped, 290H at the primary) as a 4.5:1 step down ... call it a 12k:600R. Loading the seconday with 250R the gain was -1.7dB pretty flat everywhere but .......
51: Here's another (2.30)
Posted by Doc B. on 2005-03-29, 18:15:29 (24.22.245.49)
Here's my headphone amp. Dual mono MQ PGP 8.1s thru ultrafast snubbered rectifiers into a LC filter using MQ EXO-03s as filter chokes to scrub off a few volts and cream any ripple. DC heater supply wi .......
52: RE: TL-404 as headphone/guitar output... (2.28)
Posted by Gordon Rankin on 2012-08-06, 08:06:38 (216.196.208.207)
Chris, We were at Red Rocks a month ago when I made Ed Robertson this little 5W (Celestion NEO 103dBW, 6BM8/12DW7/5AR4) amplifier. Keith the guitar tech (great guy) miked it and we were playing the th .......
53: RE: Production run of TL-404 with semi-exotic core materials? (2.27)
Posted by mqracing on 2012-10-14, 17:06:34 (108.2.182.9)
Hello Clive: I have been working on this project. Wanting to do a special transformer--- and the TL-404 is one of the top candidates. I did get some pricing on some c-cores for the TL-404 last week. A .......
54: TL-404 crossover (2.21)
Posted by Joe Roberts on 2015-10-01, 09:14:17 (73.200.18.130)
You snooze, you lose, suckers! Since nobody hopped on my deal for NOS TL-404s I decided to put them to use. I only wanted to sell because I hate to see parts sitting unused for more than one dec .......
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