[Amps] Alpha 78 won't turn off

[Jim Barber]

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 at aol.com>
> To:<amps at 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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