[Amps] Alpha 78 won't turn off

[Sam Carpenter]

This may not be one of them, but some amps and relay/LC based tuners
"Exercise" their relays from time to time, even when turned of. It tends to
make the not so often used ones stay motive and contacts cleaner by not
letting dust build up on them. As I recall, the solid state Yaesu amp is one
of them that does. It may be worth calling. If it bothers you, they may be
able to "write it out" of your firmware.

Sam

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Robert Friess
Sent: Thursday, September 22, 2011 2:32 PM
To: audioguy at q.com
Cc: CHUCK CULLIAN; amps at contesting.com
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 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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