PPIMV for Blues Jr.?

[Firestorm]

There's nothing wrong with the circuit (that value and voltage changes won't fix). I have one, too. It's the build that's a problem. PCBs are a bitch to fix. The pots are PCB mounted. And especially the ribbon connectors wreak havoc. On paper, the circuit is fine, but in practice there are all the wrong leads paralled in the ribbons. You have to cut between the leads and push some down and pull some up. Crazy.

If you don't want to go that far, you can do pretty well "chopsticking" the ribbons by moving them in and out, bending, folding, etc.

[The New Steve H]

I have a new problem!

Yesterday the amp played fine for several hours. I turned off the main switch when I went to bed. I turned it on today...no power.

The power LED does not light up. I measured the DC at the top of the caps, and it was 5V. The fuse is fine. I have 123V AC going into the power transformer

I measured the resistance across various bits of the PT. The highest value I got (red to red, with the wires disconnected from the PCB) was around 43 ohms. I am wondering if the PT is fried, but I can't figure out what I could have done to cause that.

I have never had a PT problem, so I don't really know how to diagnose them. I am also concerned that if I put a new PT in without finding the cause of the problem, it will blow, too.

What on earth did I do to this thing? I added a PPIMV and I shorted two terminals on the Middle pot. I don't see how that could cause this issue.

I was playing with "Master" on 10 and "Volume" on about 4, with the PPIMV turned down pretty low.

[The New Steve H]

It acts like the primary winding of the PT is open somewhere, so I checked, and the resistance between the ends of the black and white wires is infinite.

?????????

It's like a connection melted in there somewhere and opened the circuit.

[Firestorm]

Double, triple check. B&W are indeed primary and primaries never, ever, hardly ever go south. Is there an internal fuse in this model? What year? They made a lot.