Tube Town B-Flex

[XjFred]

Is it a good, clean pot? Honestly a lot of the time, pots just need a good contact spray shot, even new ones.

I'll try that. It's a brand new Alpha pot, DPDT push-pull.

 

[JohnnyCreepy]

Just out of curiosity, does anyone have any idea why I hear a little noise toward the end of the MV's stroke, which then disappears completely as soon as I push it to the limit?

Could be related for lead dress with certain resistance settings on following tubes grid making the master vol pot wiring to pick up surrounding noise. Take a wooden or plastic stick and move wiring when the vol pot is set as most noisy spot to see if lead dress is the problem here.

 

[XjFred]

Problem solved.

Adding the MV potentiometer required me to run a long cable between the slider of that MV potentiometer and the grid stopper resistor of V2. I had opted for a shielded cable. But I hadn't connected the shield to ground.
I've just soldered it to the terminal on the potentiometer that's connected to ground, and the noise is gone.

This kit from Tube Town is truly excellent, well-made, and has a beautiful tone. I highly recommend it.