Roland TB303 env knob not tweaking

Synth Repair
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Hello Tweakers :smiley:

I wonder if anybody can help with a diagnosis .. :wink:

My Roland TB303’s envelope knob seems to have died, all other knobs tweaking but the env nothing.

doesn’t seem to be the knob itself, could it be a component or transistor or something?

Thank you folks :wink:

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Worth gong through the service manual for this and getting hold of a replacement pot.

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many many thanks sargfowler! your advice much appreciated