[R-390] Low Audio

[Tom Bridgers]

Fred,
Have you checked for leakage from the pot to ground? I have found many pots
that tested okay as far as resistance goes, but what tripped me up (and
caused problems in the circuit) was that the pot was shorting to the pot
case (and therefore to ground) at a relatively high resistance.  Some older
pots are failing this way.  Heath VTVM pots are notorious for this.
73's,
-tom

----- Original Message -----
From: <fwbray at mminternet.com>
To: <r-390 at mailman.qth.net>
Sent: Tuesday, December 13, 2005 3:24 PM
Subject: Re: [R-390] Low Audio


> Update on the low audio problem.
>
> Last night I used a VOM to check the pots.  All three of those cleaned (RF
> gain, local audio and line audio) with Deoxit report the correct values
> and seem to track correctly when I measure between the wiper and either
> side.  So, the problem would seem to be elsewhere.
>
> I am going to make resistance and voltage measurements on the audio deck
> tonight.
>
> Thanks for all the comments and suggestions.
>
> 73,
>
> Fred Bray
> KE6CD
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