hi, My LC-21 needed a new pot because it was becoming noisy with unbalanced outputs. I cleaned it a few times to no effect so I bought one off eBay from a seller who says his to be a drop-in replacement. The only differences from the original pot is this is a twist to turn on (rather than pull) and there are 5 taps (3+2) , instead of 4/ side on the original (3+1) . He told me to measure the 2 taps and use the ones that's were closest to the original. I installed the new pot using the notes I made before desoldering and confirmed the wiring on the original LC-21 assembly manual. Double checked everything and powered up. The first LP I played had good, clean, balanced sound but then the left channel turned off and I now only have sound coming from the right channel. If I move the balance to L, I get no sound except when I turn the pot to full. That's when sound comes out of the left channel. I double checked all the solders and connections again but everything seems to be correct. I swapped preamps to be sure it's not the amp and I confirmed it's the LC-21. What should I check to fix this? TIA!