[Boatanchors] Continuing Saga: Thordarson T-3S22-A Transformer

William Morton w_b_morton at hotmail.com
Sun Sep 22 11:25:04 EDT 2013

Hello All,

I have been searching all over for a description of this particular transformer and finally found a link to the Thordarson catalog number 400G, dated 1947.  

The transformer is listed on the back cover and there is a small note referring to the Thordarson 500 catalog for all broadcast items.

This particular transformer is in the 'Major Series' group and the frequency response is spec'd at 30-15000 cps +/- 1/2 db.

Primaries are:  1250/5000*/450/600*
Secondaries are:  50/200*/125/500*/1.25/5*/3.75/10/7.5/15*

* Indicates balanced center tap.  Rated at 60 ma per side.

This seems to be the one, but the lengthwise mounting dimension does not match.  Hmmm...

Does anyone out there have a Thordarson 500 catalog that mentions a T-3S22-A?  I would suspect the date would need to be 1947 or later.

Thanks in advance for your help.

Best Regards,


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