VintageKustom.com: Repairing Kustom Amps » severe reverb problem on K100 model 2

severe reverb problem on K100 model 2 [message #17645]

Sun, 04 November 2012 16:52

UncleSpot
Messages: 2
Registered: November 2012
Location: Lodi, California

Junior Member

'been working on tube amps since 1968. 'seen most problems, never NOT been able to fix...
'have 11 Kustoms, and just acquired a K100, model 2 piggyback (2x12). The problem: the reverb is ON (sounds like it's turned up 1/2 way!) when the pot (R171) is all the way down. When you turn the reverb up it goes WAY past "surf music".
If the chassis is LIGHTLY touched it makes the "reverb explosion" like it was kicked (HARD).

Pulled EVERY xstr and put them on my curve tracer and they're all functioning like they're suppose to. Checked all caps to make sure the ESR is not high and they're within spec. Changed out the reverb tank with 3 others: NO change. WTH am I missing? I can NOT use this amp ANY where with this problem. I have a schematic, but it doesn't exactly match the PCB104 in the amp. I've never heard of this kind of problem...
TIA,
Ron

Report message to a moderator