[AMRadio] Re: 4-65's

Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Thu Apr 5 21:01:15 EDT 2007

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...



> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rick Brashear
> Sent: Thursday, April 05, 2007 8:39 PM
> To: 'Discussion of AM Radio in the Amateur Service'
> Subject: RE: [AMRadio] Re: 4-65's
> Hey Brett..  What configuration did you use with the 3 X 4D32's?  
> Rick/K5IZ
> ...I also built the 3x 4D32 rig modulated by 811's, the 4D32's run
> 1250 volts, same as the modulator. Works good.
> What the 4-65 wants is a pair of 75TH's, very rare tubes!
> Brett
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