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Ref: [Amps] AL-1200 Pop

To: "" <>
Subject: Ref: [Amps] AL-1200 Pop
From: Will Matney <>
Date: Wed, 07 Jul 2004 18:56:12 -0400
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I'd say it was the tube arced internally first thought. I wouldn't discount parasitics causing this either. There's not too many things that cause a loud pop in an amp. If it were an electrolytic capacitor, you'd smelled a real sour smell coming from the amp and foil with paper would be everywhere it "once" was. If the coupling cap shorted, it should have blown a fuse. If the tube did arc, it would have blown a grid resistor if that amp has them. Some uses a choke and some none at all. Let's put it this way about parasitics, MFJ the manufacturer of your amp threatened a law suit over someone even mentioning parasitics causing tube and band switch arcing! Now that should tell you something about it.


"Subject: [Amps] AL-1200 Pop

I just finished replacing the open frame relay in my old AL-1200 with the Ameritron relay PCB mod. Put it all back together, seemed to work fine,tuning on 40m. Moved to 160m, had the Amp in Standby while I set the output power on the exciter. Heard a loud Pop - exciter power only.I turned the Amp off for awhile, then tried it again. It still works fine.I opened it up looking for a visibly bad component, none found. Any ideas what this might have caused a Pop in Standby? Should I worry?"


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