[AMRadio] Re: 4-65's

Rick Brashear rickbras at airmail.net
Thu Apr 5 21:05:23 EDT 2007

Cool!  That sounds like a fun  project and easy voltage to attain.


3 in parallel, pi net.
1250 volts on the plates at about 300 ma gives
about 300 watts out, 1200 watts pep.

They were going for something like $12.00 a tube new
a while ago and I got a bunch of them for the 32v3's...

The rig started out as a pair, and I just stuck another one in.

I am really surprised at how well the rig works.

The tubes laugh at 1250 volts, I have the ultra modulation 
circuit built in and even on very high peaks, nothing arcs.

That is more then twice the recommended plate voltage with
plate modulation...


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