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Last Call on TL-404 autoformer

172.58.201.166

Posted on February 3, 2017 at 19:37:31
mqracing
Manufacturer

Posts: 4307
Joined: June 29, 2000
I'm down to my very last pair of TL-404's. This last pair is an XL version meaning it has the larger (133%) stack than the regular 404 had.

Here is a very brief description of the 404.


In a nutshell--- it is a small signal ( <3 watts) autoformer with a nominal "primary" impedance of 5K and nominal secondary impedances of approx 500\600 down to four ohms. It has often been used as a linestage outut trans and also an earphone output transformer. It is parafeed only and you must use blocking cap in front of transformer (i.e., in btwn plate of tube and input on pri side).

If you use the search engine with TL-404 there is close to two hundred posts on this guy.

Last call on a truly Peerless design.

$600 a pair plus shipping.

Email me at acrosound@aol.com






Builder of MagneQuest & Peerless transformers since 1989

 

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Some additional specs on the TL-404 autoformer , posted on February 4, 2017 at 13:47:36
mqracing
Manufacturer

Posts: 4307
Joined: June 29, 2000
The nominal winding resistance of the "primary" is 88 ohms. It's nominal reflected AC impedance is 5000 ohms.

The nominal secondary (load) impedances are 4, 10, 50, 200, 500 ohms.

These load impedances may be varied plus or minus 25%.

Frequency response +/- 1dB from 20 hz to 100 khz as shown in graph below.

The MOL at 25 Hz is 100vrms across full "primary"

The MOL at 30 Hz is 125vrms across full "primary"






Builder of MagneQuest & Peerless transformers since 1989

 

RE: Some additional specs on the TL-404 autoformer , posted on May 5, 2017 at 22:25:49
OldNuke
Audiophile

Posts: 79
Location: Silicon Valley
Joined: November 18, 2014
Contributor
  Since:
February 27, 2015
Mike,
Are these gone?
Alonzo

 

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