[Amps] Alpha 76 "SNAP" noise

[Carl]

HV electrolytics and their associated components John.

Carl
KM1H



----- Original Message ----- 
From: "John G3UUT" <amps at grebe.plus.com>
To: <amps at 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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