Greazygeo

Greazygeo, Have you changed the preamp tube? Did that first.....no difference. This is the 100 watt twin w master volume, no mods or anything changed either. Where does the circuit actually start and end?? It looks like it feeds in at the 220 K mixing resistors......thanks for any help....... If that does not help, its time to look at it with a meter and scope. Regards,

Hey, I have been working on a silverface Fender Twin. The vibrato is not making any sound. THe light bulb is flashing and will speed up and slow down with the controls. It seems like there are no shorted resistors or open caps. I can stop the bulb from flashing with the footswitch too. I guess I don't understand the circuit's signal flow to know where it begins and ends...The vibrato seems to want to work except i can't hear it.......any suggestions??