Having a helluva time with this. I thought the bias was changing every time I tried to finalize this build, but what I discovered is rotating the intensity pot is changing the bias from 20ma to 100+ ma! What's really weird is even if the vibrato circuit is disabled, (so not working) it still does the same thing. I tried various bias schemes, even eliminated the adjusting pot and wired it like the original schem. No help. What the heck am I missing here? I have tested the bias pot and the intensity pot and find no issues with the pots. What in the world would make the bias measured ma change that much?