I feel like the wheels are coming off this build. Now 1 side of Tube voltages way low

[SoulFetish]

Right, the 1.5v is the bias across the driver tube, the -41v is the bias voltage on the power tube grid. They are of course separate things. I agree -41 at the grid is a problem. Would be helpful to see the other side voltages too.

Just to rule things out, measure voltage ACROSS the 50k grid stopper to the lower output tube. Should be zero volts.

Looks to me like you want more current through the driver tube. I get about 15ma with a crude calculation. That would move the -41 about 40 v more positive.

I'm going to print the schematic, write in the relevant voltage readings on each driver and output tube, and post them later on.
I'll measure the voltage across that grid stopper and let you know what I find, Enzo.

[SoulFetish]

Okay, I know it seems like I've been paranoid about the tube sockets. But, I just pulled the 12AU7 and it has this weird blueish residue on all the pins. The pics show it where it clumps up, but it tough to see that there is a thin film covering mos of the pins. Look at this:





Its not oxidization from age; its has a kind of tacky consistency. Plus I found it on the pins of brand new tubes in the remaining original sockets. Would DeoxIT break down Micalex or Teflon??

[Enzo]

Deoxit is benign. Polish those off with a wire wheel in your Dremel. And look close to see if your sockets are contaminated.

[SoulFetish]

Deoxit is benign. Polish those off with a wire wheel in your Dremel. And look close to see if your sockets are contaminated.

I got most of it with a brass wire brush. I have no idea how you knew i had a dremel, but its a good call using it to polish any off anything remaining.

[Enzo]

I assume any serious shop has a Dremel, and it it doesn't have one, it would go out and get one. A VERY useful tool.