chromeblue
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- Aug 9, 2011
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tubes not the problem.plugged guitar into return of fx loop and sounds great.any ideas?
yes,both channels.tubes are good. thanks for the reply.Monsta-Tone said:Does it happen in both channels?
I would look at preamp tubes.
Should be a tube chart in your manual that tells you what each tube does.
had it since brand new ('96).Thank you very much for that list of other possible causes.Monsta-Tone said:Then I would definitely try plugging a short patch cable from the Send to the Return.
The original circuit would not make much of a difference if the loop jacks are dirty.
You might have gotten one that has had the loop modified to series.
If this is the case, then all of the signal passes through a little switching mechanism on the Send jack.
A simple jumper with a patch cable might just take care of the problem.
I almost always replace the send jack with a Switchcraft 12A ( http://www.tubesandmore.com/scripts/foxweb.dll/moreinfo@d:/dfs/elevclients/cemirror/ELEVATOR.FXP?item=W-SC-L12A )jack when I change the loop to series. That way I know this won't happen.
Other than that.....
Could be:
Dirty input jack
Dirty pots (output volume)
Loose pot housing (output volume)
LDR's not switching properly
Dirty tube socket (V1 through V5 if it works when you plug into the loop)
Bad solder connection on preamp board
Leaky coupling capacitor
Hope this helps, usually it's the loop or tubes.
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