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[Amps] bias for 3cx3000

To: amps@contesting.com
Subject: [Amps] bias for 3cx3000
From: "Stan C." <kf6ikc@sbcglobal.net>
Date: Sun, 3 Oct 2004 16:40:16 -0700 (PDT)
List-post: <mailto:amps@contesting.com>
Hello to all. I need some of the experts to give me some advice on a HB amp I 
am building. I am using a 3CX3000A7 in GG. I want to ad some bias to bring down 
the zero signal current. To do this I want to use a variac,small 
transformer,and rectifier.
 Will this work. I am looking at a 3-5 amp variac. A 24vct transformer rated 
for 5 amps. And a bridge rectifier (the square kind you bolt down). 
 Will this work? Do I need to use a small choke in series with the rectified DC 
to the cathode? Do I run the B+ to the cathode and B- to the grid current 
meter? 
 I hope you can get an idea of what I want to do with this little bit of info. 
I would like to be able to vari the bias voltage and that is why I am not using 
a bunch of zeners,block diodes,etc. And yes I know you can run this tube zero 
bias. But I like a little bias to help the tube run a little cooler,etc.
 Any help or ideas would be great. Always like to enrich my knowledge.
 
Take care,Stan


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