[Amps] Alpha 76A mystery plate xfmr

[Jim Garland]

> 
> 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.
73,
Jim Garland W8ZR