[VHFcontesting] 3cx800a 222 amp

[Bill Olson]

yeah, duh, I was talking about the grid collet!! so where I said "cathode connection" was just me being stupid, what I MEANT was I seem to remember there needed to be just a little inductance in the grid connection, so with homebrew collets you had to diddle with the number of fingers a little..
 
bill
 

 
> From: w8zn54 at verizon.net
> To: callbill at hotmail.com; vhfcontesting at contesting.com
> Date: Tue, 20 Oct 2015 12:39:16 -0400
> Subject: Re: [VHFcontesting] 3cx800a 222 amp
> 
> I've built several 3CX800A7 222 amps and the cathode circuit that was used
> on the 8874 version was the same. The plate line changed.
> 
> Terry - W8ZN
> 
> -----Original Message-----
> From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On Behalf
> Of Bill Olson
> Sent: Tuesday, October 20, 2015 12:00 PM
> To: VHF Contest Reflector
> Subject: Re: [VHFcontesting] 3cx800a 222 amp
> 
> 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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