[AMRadio] Re: 4-65's

Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Thu Apr 5 21:14:13 EDT 2007

I would say the hardest things to get are the 4D32 sockets.
The tubes are cheap, you could run it at
1000 volts and use DX100 size parts except for the coil
which should be bigger for 300 watts.
I used copper tubing.

The way I am running it, I get 300 watts out for 375 in,
with 75 watts plate dissipation out of a total of 150.

So I am running it light, but they modulate real well that way.

I have almost as much modulator power as RF input.
Its clean that way.


> -----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 9:05 PM
> To: 'Discussion of AM Radio in the Amateur Service'
> Subject: RE: [AMRadio] Re: 4-65's
> Cool!  That sounds like a fun  project and easy voltage to attain.
> Thanks,
> Rick
> 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...
> Brett
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