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**Old Tele man** · 07-20-2018, 10:40 PM

Excellent find!

**vintagekiki** · 07-20-2018, 11:09 PM

Transformers

http://audiophool.com/Techno.html

1934 Thordarson Catalog 341 - Replacement Transfomers
1935 Amertran (American Transformer) catalog
1938/39 Thordarson Catalog 400C
1941 Thordarson Tru-Fidelity Transformer Catalog 500FX - DjVu format
40s-50s data sheets from Utah Transfomer and Thordarson (universal series)
1947 Thordarson transformer Catalog 400G - DjVu format
1964 article on estimating ratings of unknown transformers 1, 2 (thanks to Alan Douglas)
1994 (reprint) article on measring unknown filter chokes from Sound Practices: 1, 2

More transformer catalogs (thanks to Pat Jankowiak), all in DjVu format:
Merit 1951, Triad 1952 (partial), Stancor 1954, UTC 1960, Stancor 1966, Triad 1971 (partial)
...and more: Chicago Transformer 1958, and Centralab (includes those pesky PECs or couplates)
...found at a hamfest: Kenyon Transformer 1940 and Stancor 1951 - and UTC Terminal Arrangements
...and Clarostat 1946

Perhaps more than you'd like to know on transformer design from Patrick Turner

A few old transformer catalogs from Pat J. - are BACK at the Bunker of Doom!

More transformer catalogs from Pete Millett, and a few reference books too Mmmm... Donuts!

Plitron has several articles on toroid transformers for audio TubeCad Journal

**vintagekiki** · 07-20-2018, 11:24 PM

http://www.one-electron.com/FC_Trans.html

Dynaco transformer catalog, with various schematics, including tube Dynaco kits. 3.2 Mb pdf
Hammond transformer web site
Jensen audio transformer web site
Lundahl transformer web site
Magnaquest transformer web site
One Electron transformer web site
Sowter audio transformer web site
Stancor transformer web site
Tamura audio transformer catalog from 1996, in Japanese, 845K pdf file
Thordarson input transformers (from a sheet found in a Thordarson box), 271K pdf file
Triad transformer catalogs from 1951 to 2002
UTC terminal arrangements - for A, HA, HC, HP, LS, O, and P audio transformers, 489K pdf file
Acrosound Catalog from 1955 - has classic hi-fi amp circuits, too! 1.4Mb pdf file
Stancor Catalog S-106 from 1961. 4.9 Mb pdf file
UTC catalog 510 (1951?) 18 jpeg images.

**vintagekiki** · 08-13-2018, 10:58 PM

Vox AC30 Transformer

https://www.vintage-radio.net/forum/showthread.php?t=115564

... ... ...

http://web.archive.org/web/20120430191343/http://www.vintagepedalworkshop.com:80/ac30-transformer-corner/

Vox AC30 Transformer Corner

1/ Parmeko Choke Article � A description of the construction methods and materials used in a 1960′s Parmeko AC30 Choke.

2/ Woden Power Transformer � Winding and construction details.

3/ AC30 Output Transformer tear-down � Winding and construction details.

4/ AC30 Output Transformer Rebuild (page one)

5/ AC30 Output Transformer Rebuild (page two)

6/ AC30 Output Transformer Rebuild (page three)

7/ The JLWtools NZ-2 Coil Winding Machine � Review.

203

**vintagekiki** · 08-14-2018, 08:20 AM

Audio Transformer Design & Construction

http://vintagewindings.com/products/TransDesign1.html

http://vintagewindings.com/products/TransDesign2.html

http://vintagewindings.com/products/TransDesign3.html

**Mike Sulzer** · 08-14-2018, 05:41 PM

Thanks. Great link to winding an SE transformer

**SoulFetish** · 08-14-2018, 10:31 PM

I'll add these links which has some good transformer design information as well as output stage design material:
http://www.turneraudio.com.au/education+diy.html
http://www.turneraudio.com.au/

**vintagekiki** · 11-07-2019, 04:29 AM

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