Tone stack issue after loop install

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iknowjohnny
Posts: 1070
Joined: Thu Apr 24, 2008 2:10 am
Location: los angeles

Tone stack issue after loop install

Post by iknowjohnny »

Someone at another site gave me a design for a effects loop coming from the wiper of the treble pot for the send and the return into the master. This is a 2204 type amp tho 6v6 output. After the loop was in, and it works great by the way, i then noticed a issue with the tone stack. The treble pot now only has effect from noon to full up. The other half of it;s range that should take it from average brightness to mud has no effect. At noon it sounds the same as it does all the way down. I tried adding another 220k in series with the 220k coming off the wiper but no luck. Anyone have an idea what i might do to rectify this? Heres the cathode follower to PI section of the schematic...

Oh, and i should mention i don't run long cables, only a 1 foot in the send and the same in the return for a DSP that sits atop the amp.
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