It would help to know what relay
----- Original Message -----
From: Robert Friess
To: audioguy@q.com
Cc: Carl ; amps@contesting.com ; CHUCK CULLIAN
Sent: Thursday, September 22, 2011 2:32 PM
Subject: Re: [Amps] Alpha 78 won't turn off
I have a 87A that has a slightly different problem. When plugged in, but
turned off, occasionally a relay starts to chatter randomly. It goes on for a
few seconds and then stops until the next time. Any ideas of what that could
be?
Bob, N6CM
On Thu, Sep 22, 2011 at 11:16 AM, Jim Barber <audioguy@q.com> wrote:
I suppose in the case of my 76A it could be "sticky" contacts, since it
only does it when warm after usage, and then only sometimes.
Carl, you wouldn't happen to know of a good replacement off the top of
your head, would you?
Thanks,
Jim N7CXI
On 9/22/2011 11:11 AM, Carl wrote:
> Sounds like K1 has welded contacts and it is a family affair as the 76
> series has the same circuit.
>
> A semi PITA to replace as its down low and behind the front panel.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "CHUCK CULLIAN"<k6rf@aol.com>
> To:<amps@contesting.com>
> Sent: Tuesday, September 20, 2011 11:07 AM
> Subject: [Amps] Alpha 78 won't turn off
>
>
>>
>> I have an Alpha 78 that wouldn't turn on and I found that a 10K power
>> resistor that dropped the 220 down to 110 to turn on the main relay was
>> open. When I replaced it, the amp came on but when the off button is
>> pushed, it only turns off momentarily while the off switch is held. When
>> I let up on the Off switch, the amp comes back on. Any ideas?
>>
>> Chuck K0RF
>>
>>
>>
>>
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