[Amps] Alpha 78 won't turn off

[Robert Friess]

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 at 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 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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