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1. [Amps] Another 50MHz oscillator (score: 1): Author: "Martin Sole (HS0ZED)" <martin@hs0zed.com>; Date: Mon, 20 Jul 2015 20:14:56 +0700; The recent postings about the SB220MHz high power oscillator brought to mind an amp I came to own as part of a job lot of other goodies. This is a totally homebuilt 50MHz amp using 2 off 4CX250B tube; /archives//html/Amps/2015-07/msg00068.html (9,230 bytes)
2. Re: [Amps] Another 50MHz oscillator (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Mon, 20 Jul 2015 18:30:00 +0300; It looks like a grid-driven push-pull amplifier. I don't see any evidence of a neutralization circuit, which certainly could explain the oscillations. It should be easy to add a traditional cross-neu; /archives//html/Amps/2015-07/msg00070.html (10,804 bytes)
3. Re: [Amps] Another 50MHz oscillator (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Mon, 20 Jul 2015 11:51:18 -0400; Hi All, Vic is probably exactly correct. Assuming this to be the case, the amplifier likely has more than 20 dB of gain. That makes the need for neutralization even greater. Also, depending on how yo; /archives//html/Amps/2015-07/msg00071.html (11,746 bytes)

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