Aging Alpha amps with the push button pop-out switches are a bear to find and
to replace. The larger problem other than unavailable part and wear failure is
that with the pop-out design, u can not just replace one of the gang.
On relay contacts and Morse keys, I start with a piece of clean typing/printer
paper and put that between the open contacts and then push them closed trapping
the paper between them. Then, pull the paper out, wiping both upper and the
lower contacts. You can do this a number of times until the paper remains
clean afterward.
That very gentle solution sometimes works. If not, then u are into very very
fine emery cloth from a jeweler.
I suspect a sick switch but relay is also possible, as you know. 73
Charles Harpole
k4vud@hotmail.com
> From: Gary@ka1j.com
> To: amps@contesting.com
> Date: Tue, 22 Oct 2013 00:17:02 -0400
> Subject: [Amps] Alpha 77D likes to remain on
>
> Recently this 77D converted to SX wants to remain on regardless of
> the selection on the power switch. I found if I bump the back of the
> chassis it resolves the problem so whatever it is, it's jarred loose
> via a small tap to the chassis. I'm thinking one of the HV relays has
> some pitting on the contacts and is staying closed once engaged.
>
> Any alternate possibilities and if I'm right, how to best dress the
> contacts so they won't stick again?
>
> 73,
>
> Gary
> KA1J
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