All channels that I have work great but have various intermittent issues like:

-Scratchy pots

- intermittent switches

- intermittent jacks

These are best for anyone ready to clean up, replace parts, or modify/upgrade these boards. 

PLEASE NOTE: These do not come with knobs for the pots. I'd happily provided them but the plastic is "crumbly", so they're not really useable. I can toss them in if you want to try them though.