egnater tweaker 15 master volume quit working

[Smitty2]

Hey all Ive got a odd issue with a Egnater Tweaker. The master volume has just quit, nada nothing... From what Ive read it is a post PI master vol..I got the amp and the guy was running it on 4 ohms and didnt know it, should have been set on 16 ohms, Ive checked the pot the resistors and caps on the PI check ok. The only issue i did find was the PI tube tested bad on one half, put in a good tube but no help..I don have a schematic I asked for one and am waiting to see if they will send me a copy so can see voltages and how this amp works.. Anyone out there have any input ?? the gain acts as the amps volume and you cant overdrive the PI so clean is all there is no matter how you tweak it..It did have a issue with static on power up and shut down but i have fixed that, all he jumpers are working Im at a stand still on this one..... suggestions welcome I am not real familiar with Egnaters, so far new power tubes and new PI tube,, wondering about the tranny and the 2 transistors in V1.. BTW it is not blowing fuses just no master volume, is does make a small audible hiss but gets silent when turned up all the way ... Im stumped...

[Structo]

Well have you measured the sweep resistance of the master pot?

The wiper may have lost contact with the trace.

Also check out the OT.

If he ran it hard like that it could have fried it.