09-27-2021, 06:39 PM
Well it seems a quality 500K audio taper pot with solid metal shaft is a tricky thing to find. Apparently it's a common part in electric guitars and amps. NOS ones are almost non-existent and modern production looks cheap with short knurled shafts. I'll did through my used parts.
Meanwhile, I'm working on a curious issue. The volume cannot be turned all the way down. Even with the grid of the 27 DET AMP tube grounded there is significant volume. Grounding the grid of the 27 1st AF tube completely kills the sound.
I'm thinking there is some crosstalk between leaky caps. Perhaps inside of the #30 capacitor box ?
I'll start by replacing the #23 coupling cap then move on to box #30.
Meanwhile, I'm working on a curious issue. The volume cannot be turned all the way down. Even with the grid of the 27 DET AMP tube grounded there is significant volume. Grounding the grid of the 27 1st AF tube completely kills the sound.
I'm thinking there is some crosstalk between leaky caps. Perhaps inside of the #30 capacitor box ?
I'll start by replacing the #23 coupling cap then move on to box #30.