noisy presence pot in a 5F6-A build

[labb]

Just finished building a 5F6-A. The only issue I have so far is a noisy presence pot when it is rotated. Any suggestions  how to correct this problem.

[tubeswell]

The stock 5F6A presence pot is scratchy because the design leaves DC on the pot (all 5F6As were like this). If you don't want that, then use another presence circuit (like the 6G6B bassman circuit) where the presence pot is isolated from DC.

[labb]

Thanks for the reply. That is what I was thinking but wasn't sure..