[VHFcontesting] 3cx800a 222 amp

Bill Olson callbill at hotmail.com
Tue Oct 20 12:00:03 EDT 2015

Ralph, I'm really straining my brain here, but I seem to remember these triodes wanted a little inductance in the cathode connection to "neutralize" them. I remember with an 8874 on 220 back 35 or 40 years ago I build a home made grid collet with finger stock.. The finger stock was in a solid ring at first but in order to make the thing work I had to keep bending fingers away from the grid ring on the tube.. That's all I remember, don't have that amp any more..
Steve, W1SMS, now owns and runs Lunar Link, I'm sure he has the info you want..
bill, k1DY
> Date: Tue, 20 Oct 2015 11:23:01 -0400
> From: mathenyr at marietta.edu
> To: vhfcontesting at contesting.com
> Subject: [VHFcontesting] 3cx800a 222 amp
> I remember reading that there was a K1FO 222 amp using a 
> single 3xc800a7 tube.  I have tired to get such an amp to
> behave without success...cathode circuit problems.
> Does anyone know if the K1FO amp description was ever 
> published?  Does anybody have one of the amps who could 
> send me a copy of a manual or perhaps photos??
> Also looking for a proper grid collet for the thing...
> Eimac 720359 ...  anybody know a source?   The grid collet
> may be my problem, but I am on my second "hamstyle" version
> and getting frustrated.
> The 2M version of the thing worked first try....
> Thanks..
> de K8RYU
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