You will need a much bigger filament xfmr, bigger blower. I just replaced
my 8877 for 1 3CX1200D7 in my Henry 4K-Ultra. It works fine. If I were
you, I would consider just using 1 tube and block off the other hole.
Bob W6TR
----- Original Message -----
From: <PlanerGuy@aol.com>
To: <amps@contesting.com>
Sent: Wednesday, July 26, 2006 5:14 PM
Subject: [Amps] 3-500Z to 3CX1200D7
> What is generally involved with changing from a pair of 3-500Z tubes to a
> pair
> of 3CX1200D7's, not including HV power supply concerns?
>
> Reason I ask is that I was offered a set of 100% 3CX1200D7 pulls, and
> thought
> they'd might work out pretty well in a Henry 2K ClassicX.
>
> Thanks for the space here.
>
> KC8GIA
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