The max spec for the 6V6 is 250V, yet they are commonly pushed to 350v, 400V and beyond. The difference between the two transformers is marked! These come in two general flavors: For the 12AX7, that's a pretty low operating voltage.
We'll stick with 150 ohm for now. Wiring I used point-to-point wiring for the project. Your DMM should have a clearly-marked diode check function which you can use to verify them.
Post detailed pics for forum review before applying power. There are many options: This is unacceptable, today. Parallel Mounting.
I already had three for my Ampeg... The Wire. And they come pretty close to our target value: If it were amps alone, then even a AA battery can supply many times what's needed to stop a human heart.
The load resistance is listed on the datasheet: Switched out, the punchy, raw sound returns. The tone control itself changed several times.
But they do work, and decent tones can be found, with a bit of messing about. Smaller waveform so ground clip is on outer foil lead. I have run into turrets that still have some sort of lubrication on them that can make soldering very difficult.