Mark IV effects loop

scotteggshell · Jan 28, 2009

Hi I have a Mark IV - a while back the right return channel of the effects loop stopped working. The Mk IV drawing I have shows a different effects loop setup than my amp. My amp a Mono Send, and Stereo/Mono return, the drawing I have shows a "normal loop / Switched loop configuration. Does anyone have a drawing of the effects loop for this config ? The amp is around 6-7 years old.

If anyone can help me, I'd appreciate it.

Scott

ANIMATED SUSPENSION · Feb 3, 2009

Try changing the 12ax7 in v2 (next to the shielded one), that powers the FX return stage.

scotteggshell · Feb 3, 2009

Ok, I'll try at rehearsal tonight, but I am doubtful, as one side is working OK. Wouldn't the left and right be summed with a couple resistors before reaching V2b?

Thanx
S

Mark IV effects loop

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Mark IV effects loop

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