Date: Sat, 13 Aug 2016 11:11:33 -0400
From: Jim Durham <jimdur@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] SCR to adjust 240v to 200v
Thank you, Boye (OZ7C) and the others that replied. I think I did not
explain my project clearly.
First of all, yes, I know about buck transformers. I am using a Variac,
which does the same thing and also allows me to adjust the input AC
voltage. The Henry 2K has the filament voltage supplied from a winding
on the plate transformer, so, with the Variac, I can adjust the input AC
voltage to give about 9.8 volts for the filaments, which is ideal and
produces 3000 volts for the plates.
A large buck transformer or Variac requires an external box, which is
what I am using now. They won't fit in the amplifier without seriously
hacking up the cabinet. I don't want to do that.
So, I was just asking if anyone on Amps had tried using an SCR to
control a large choke-input power supply ? That sounds attractive and
would fit in the cabinet, but also might damage the power supply choke
by applying non-sinusoidal power (the 2K-2 has a choke input power
supply). That was my question.
Thanks to all, I should have explained more clearly what I was asking.
73 de Jim, W2XO
## still another method is to use a small variac on the primary of the buck
xfmr.
Sec of buck xfmr goes in series with one leg of the 240 line. Then u can
easily
dial up the exact buck voltage you want. Forget the scr, not gonna work.
Or use a buck xfmr with several taps on both the pri and sec.
Jim VE7RF
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