[Hammarlund] AVC problems on SP-600 JX-6

[Bob Young]

I finally finished recapping the JX-6 (whoow!) although it now needs an alignment. Believe it or not I found the under chassis caps to be the hardest ones to access and replace.
Before I started and all the way through the AVC was marginal, on strong stations the meter wouldn't go down to 0 and the volume would not shut off completely. Last night I left it on for a while and came back to find the S meter pinned and it now has absolutely no AVC at all, it works normally with the AVC switch off and riding the RF gain but if I switch the AVC back on it immediately pins the meter and overloads the receiver to the point of no volume if there is any signal at all. 
Someone had mentioned the bathtub caps as the likely culprit, would it be prudent to change them all or search out the one(s) that are causing the problem? Also any other ideas as to what could be causing this problem or is it a case of almost definitely the bath tub caps?

Bob Young
Analog, MA
KB1OKL
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