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.
Carl
KM1H
----- Original Message ----- From: "John G3UUT" <amps@grebe.plus.com>
To: <amps@contesting.com>
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!
73
Andy, G4PIQ
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