Stacking transformer in an Alpha amp???? That's really tacky. You can have
one custom wound for less than $30. My guy down here in FL is W4LNI. For
anyone interested, his name is Jim and his phone number is 813-876-5531. He
does great work and if you tell him about your space constraints, chances
are good that he can accommodate you. He has built filament transformers
and multi-winding transformers for a Tetrode control board that I am using
in a homebrew amp. He also will put in multiple primary taps to help get
exactly the secondary voltage you need.
Bob W6TR
----- Original Message -----
From: "Colin Lamb" <k7fm@teleport.com>
To: <amps@contesting.com>
Sent: Monday, February 09, 2009 4:55 PM
Subject: Re: [Amps] 3CX800 filament voltage
> When converting my Alpha 76A to use 2 3CX800A7 tubes, I needed a new
> filament transformer. The problem was that there was very little space
> inside the amp. Using appropriate ham ingenuity, I solved the problem
> inexpensively. I found two small, surplus 8 volt @ 2 amp transformers for
> a few dollars at a surplus house. Stacked them on top of each other and
> they fit in the amp with 1/4" to spare. Then inserted the appropriate
> resistor in the primary to drop the voltage to 13.5. That cushions the
> starting current nicely and left lots of cash in my pocket.
>
> 73, Colin K7FM
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