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Re: [Amps] Alpha 76 "SNAP" noise

Subject: Re: [Amps] Alpha 76 "SNAP" noise
From: John G3UUT <>
Date: Wed, 24 Dec 2014 11:25:11 +0000
List-post: <">>
Thanks, looks like I got a timely warning I'll change them pronto. Has anybody looked into this? You would think that a small breakdown / healing of the dielectric would be muffled by the can and not cause such a staccato snap.

73 John

On 24/12/2014 02:10, Carl wrote:
HV electrolytics and their associated components John.


----- Original Message ----- From: "John G3UUT" <>
To: <>
Sent: Tuesday, December 23, 2014 6:59 PM
Subject: Re: [Amps] Alpha 76 "SNAP" noise

Sorry folks, are we talking about the string of smoothing electrolytics or a ceramic RF filter cap here? I'm curious about this as when I switched my 2m amp on recently which hadn't been used for about a year there was a regular series of 'snaps', the frequency of which gradually diminished as it warmed up. I was worried by this but it didn't seem catastrophic and seemed to be improving with time so I left the amp on. By the end of the contest the amp was usable (typical) - I couldn't really use it earlier as the snaps put quite a high level pulse of QRM into the RX path.

73 John G3UUT

On 23/12/2014 11:08, Andy Cook, G4PIQ wrote:
Oh yes. I heard this coming from one of our old Alpha 78s during CQWW CW at 5U5Z some years ago. It did this for quite a few hours and then in the middle of the night there was a big bang and the room filled with smoke as one of the filter caps let go. It certainly woke the operators up. I should change those caps now!


Andy, G4PIQ
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