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Total 6 documents matching your query.

1. [VHFcontesting] 3cx800a 222 amp (score: 1): Author: Ralph Matheny K8RYU <mathenyr@marietta.edu>; Date: Tue, 20 Oct 2015 11:23:01 -0400 (EDT); 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 d; /archives//html/VHFcontesting/2015-10/msg00009.html (7,488 bytes)
2. Re: [VHFcontesting] 3cx800a 222 amp (score: 1): Author: Bill Olson <callbill@hotmail.com>; Date: Tue, 20 Oct 2015 16:00:03 +0000; 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; /archives//html/VHFcontesting/2015-10/msg00011.html (9,259 bytes)
3. Re: [VHFcontesting] 3cx800a 222 amp (score: 1): Author: "Terry Price" <w8zn54@verizon.net>; Date: Tue, 20 Oct 2015 12:39:16 -0400; 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 Ralph, I'm really straining my brain here, but I seem; /archives//html/VHFcontesting/2015-10/msg00012.html (10,137 bytes)
4. Re: [VHFcontesting] 3cx800a 222 amp (score: 1): Author: Bill Olson <callbill@hotmail.com>; Date: Tue, 20 Oct 2015 16:48:03 +0000; 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; /archives//html/VHFcontesting/2015-10/msg00013.html (11,372 bytes)
5. Re: [VHFcontesting] 3cx800a 222 amp (score: 1): Author: "Dave Olean" <k1whs@metrocast.net>; Date: Tue, 20 Oct 2015 16:37:57 -0500; Hi Bill et al. The one I remember was the grid collet for the 8938 on 432. It needed a slight bit of inductance for best neutralization. I remember that Steve figured it out, although the amplifier w; /archives//html/VHFcontesting/2015-10/msg00014.html (13,307 bytes)
6. Re: [VHFcontesting] 3cx800a 222 amp (score: 1): Author: David Pruett <k8cc@comcast.net>; Date: Wed, 21 Oct 2015 01:56:19 -0400; The details for removing the grid collet fingers are shown in the ARRL UHF/Microwave Projects Manual, Volume 1 for the K1FO single and dual tube 432 MHz 3CX800 amps, and the 432 MHz 8938 amp. Not sur; /archives//html/VHFcontesting/2015-10/msg00015.html (14,189 bytes)

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