[AMPS] three 4cx250's on 50MHz

[nospam4me@juno.com]

Hi Phil and Co.

> Thank you to everyone who helped me out. I'll see if I can 
> muster a copy of the 1975 and 1978 ARRL Manuals as this 
> seems a good place to start  as well as the Net, possibly.
> The only reason I've been thinking of a dual 4CX250B amplifier is;

I was under the impression you were particular to use only two 
tubes. The older ARRL, Radio Amateurs VHF Manual has a 
50MHz three tube 4cx250B amplifier.  The tubes are horizontal 
and the construction of the amplifier could be done with more 
modern techniques, but the basic circuit is a winner. If that gets 
your motor going, I could scan the amp diagram or mail you photocopy. 

 
> 1.  I've got a number of 250B's in the junk box, along with some VHF 
> bases and associated bits to make a basic PSU.

They breed in the drawers, like paper clips and coat hangers in the
closets.

> 2.  I've got some (but limited) knowledge and experience of the  tube.

A real worker when properly applied. I run the anode voltage slightly
higher than the mfgrs choice, but I've never had one fail, ever. 

cheers
skipp
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