Re: Vibro Champ Repair Info Needed

[The Bernadettes <mdestefano@xxxxxxxx>]

Tim,
    Good luck finding a 25K reverse audio pot.  If you do find a souce, lemme know
(I don't know anybody who carries them).  If you can't find one, either a 50K RA
pot or a 25K linear taper pot would work, just not like the original.  The pot will
have a different "feel" as to how the intensity gradually increases as you turn up
the pot.  In fact most modern production pots have slightly different feel to the
taper as compared to vintage pots, even when changing like values and tapers.  I'd
try both I suggested and see which works best.

Remember to drain them filter caps before playing around inside your amp.

Good luck,
Don D.

wmharps@xxxxxxxxx wrote:

> Hey, Amp Folks (you know who you are):
>
> I have a mid-70s silverface Vibro Champ with the vibro intensity pot missing.
> It works fine without it, but I'm thinking I'd like to replace that pot, which
> was simply snipped out years and years (and years and years) ago.  If I'm
> reading the schematic correctly (and there's a GOOD chance I'm not), it looks
> like there's supposed to be a 25K reverse audio pot there (marked "25K-RA" on
> the schematic: http://www.ampwares.com/ffg/schem/champ_vibro_aa764_schem.gif).
>
> Can someone advise me what is a suitable replacement and where I can get one (I
> need the knob as well, but those don't seem to be so hard to find).  I see that
> Angela Instruments carries 50K RA pots, and 25K (non-RA) pots), are either of
> these suitable replacements.  I am NOT an electronics guy, though I can handle
> soldering the new pot in place, I believe.
>
> Anxiously awaiting good advice,
>
> -tim
>
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