[HAM] B3 Swell Capacitor

[Scott Hawthorn]

At 06:54 PM 2/9/2008, Pete Mazich wrote:
> > try switching out the 12bh7 and/or 12Ax7 for known good ones (i.e. 
> non-microphonic). Check the shielded wire that connects the swell pedal 
> (green wire) for a good connection. Also, <inside> the swell cap housing 
> there are four screws that hold down the assembly- make sure these screws 
> are screwed tight to the preamp chassis.

I was gonna post a followup and add something about the 12AX7, so I'm glad 
you did, Pete. I completely agree. That particular tube is an integral part 
of the expression control circuit and is very much subject to noise. If 
this were my problem, I would also be pulling that tube and cleaning up the 
pins and socket. I repeat my opinion that when the pedal comes to full, the 
slight banging of doing that can cause a vibration that can be picked up 
anywhere in that circuit.




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