Blues Deluxe - no sound

[mikell]

Hi Bill,
Thanks for the reply. No, the button has no effect when pushing. The light is on whenever the amp is on and I can't get it to turn off. As Far as U2 is concerned, I'm reading 16v. on one pin but only about .5v on the other . I am not really showing much of anything on the others. I have just noticed a new wrinkle. My effects loop also seems to be out of commission too. Really, if all I want is a clean loud amp, I have that but of course, I would like to sort this all out. I will pull the reverb unit manana and test but I sure would like to know what's going on with the switching. I don't remember that being an issue before I replaced the resistors and all today. Perhaps I loosened or shorted something? Could a tube be responsible?

Ok, There was one wire broken inside the reverb unit itself that I soldered back on and I see that one of the shields has broken loose on the pc board itself. Its too late tonight to take the board back out but I will reconnect tomorrow, but I tried just touching it to the tiny piece of wire sticking out on this side of the board with no result but we'll see when I reconnect. If that doesn't do it, I will substitue another reverb unit and see what that brings.
Thanks again,
Michael

[52 Bill]

As Far as U2 is concerned, I'm reading 16v. on one pin but only about .5v on the other . I am not really showing much of anything on the others.

You should have +16 volts on pin 8 and -16 volts on pin 4 of all of the ICs.

From what I'm reading here, all of your problems still relate to the low voltage power supply, in fact the negative supply to be exact. The FX loop, the reverb and the channel switching all rely on the 16 volt power supplies. If one of the supplies is not working, then all of these sections of the amp will not work correctly.

Because the channel switching bus must go negative to get the clean channel to activate, I think the problem is in the -16 volt circuit. Double check all of the connections and replaced parts and make sure that all of the ICs are getting +and - 16 volts.