sboubi:

Did you ever find a solution? My Blackfinger suffers from the identical symptoms you described, intermittent, slowly oscillating buzz/hum that occurs when pedal is either idle or when guitar signal is present; sometimes it gets “stuck” and you must disengage & re-engage to eliminate; other times it appears only momentarily. I’ve switched out dozens of pairs of tubes (new and nos), chop-sticked the components, re-soldered any suspect points, et cetera, to no avail.

If anyone else has any suggestion, please posts. Thanks.

Harrison