I had a client bring in a Blues Deluxe
Reissue and said he wanted "more" out of it. I ended up studying the schematic and attempting a master volume mod unlike what others have been doing to these units. Its a little more work, but if you put a 1M Audio pot in the PW3A-2 line, it allows you to load up the preamp before it hits the power stage. This provides a considerable amount of grit and gain to the tone, but also adds touch sensitivity and volume control of the grit.
I can email more details if anyone is interested. Basically, you have to remove the circuit board that the tubes mount to, unsolder the one
line on the PW3 ribbon (wire PW3BA-2) that goes to R40 and put a 1M Audio pot in between it. If you are careful, you can trim out that one wire from the ribbon with a blade
and isolate it from the rest. Mount the pot right in between the two preamp tubes in the chassis, theres just enought room for it. My client wanted to "try" it before drilling any holes so I just ran the wires out to the pot externally mounted on the bottom of the chassis with some double sided tape.
Side effect - You lose some level of reverb control since this mod acts to dilute it as you lower the master volume (it essentially bypasses the reverb section) and increase the preamp volume, but the affect on tone was staggering. It brought the amp to life with minimal changes. My client wanted to keep it original and not do any "permanent" mods (basically telling me dont go crazy). He was very happy with the results in live gigs. (It would be possible to retain the reverb level control by using a double level pot and running both wires (PW3B-2 and PW3B-3) going to R40 and R38. This will control both signals equally, I just didnt have a double level pot on hand).
Unfortunately, the day he was bringing it back to make the mod permanent, the amp was stolen out of the back of his car. Thought I would share the mod with you all here as I havent seen anyone take this approach.
Mod at your own risk! Let meknow if you have questions.