I have a very nice Kramer DMZ 4000 that I am inordinately fond of. Unfortunately, for some reason the tone control seems to be not functioning at all. I have checked the control cavity and not found anything amiss. The tone pot seems to be working, using my meter I found a smooth range from 0 to 515 K ohms.
Any ideas where to look next? The caps, perhaps? And how could those be troubleshot (troubleshooted?)?
If anyone has any suggestions, I would be very grateful.
Thanks a lot,
(photo of control cavity...)