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1. [Amps] Alpha 374A problem (score: 1): Author: "Jeff" <jeffdrau@cox.net>; Date: Sun, 20 Mar 2011 17:20:31 -0500; My 374A had been working fine. I went down to the shack and on 15 meters I get a loud buzzing sound, kind of a cross between a loud buzz and a vibration. As I said it had been doing fine, I get this; /archives//html/Amps/2011-03/msg00138.html (7,416 bytes)
2. [Amps] Alpha 374A problem (score: 1): Author: "Jeff" <n0ost@cox.net>; Date: Sun, 20 Mar 2011 19:08:45 -0500; My 374A had been working fine. I went down to the shack and on 15 meters I get a loud buzzing sound, kind of a cross between a loud buzz and a vibration. As I said it had been doing fine, I get this; /archives//html/Amps/2011-03/msg00140.html (7,401 bytes)
3. Re: [Amps] Alpha 374A problem (score: 1): Author: "Sam Carpenter" <sam@owenscommunication.com>; Date: Mon, 21 Mar 2011 11:57:36 -0400; Could the layers of the xfrmr be coming unlaminated? This is a sound you might expect to hear if it is happening. I remember on old henry and Collins amplifiers, loose metal near the xformr or choke; /archives//html/Amps/2011-03/msg00145.html (9,243 bytes)
4. Re: [Amps] Alpha 374A problem (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 21 Mar 2011 12:24:15 -0400; The first step would be to take the cover off, defeat BOTH interlocks, power up and try to pinpoint the noise source. If you are not comfortable doing this get help. If the hum is from the transforme; /archives//html/Amps/2011-03/msg00146.html (8,952 bytes)

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