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Re: [Amps] Alpha 76A mystery plate xfmr

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Subject: Re: [Amps] Alpha 76A mystery plate xfmr
From: Jim Garland <>
Date: Mon, 12 Sep 2011 22:52:58 -0600
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> The BTC 11163 marking on the plate xfmr means it was manufactured by the 
> Berkshire Transformer Company, in Kent, CT, and the 11163 is the model 
> number. Alas, BTC is no longer in business, which is a shame because they 
> made very high quality conventional design transformers (no hypersil or tape 
> wound). BTC would custom design an xfmr at a very reasonable price, and 
> assign a unique model number to the design. I had them build a couple of 
> xfmrs for me back in the 70s and 80s, and still use one (BTC 11145) on my 
> 8877 amp. At full bore contest mode, it is still cool to the touch, with very 
> good regulation (drops from 4700V to 4400V @ 1A.  Your xfmr was most likely a 
> heavy duty custom replacement for the original Alpha xfmr.
Jim Garland W8ZR
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