New power tubes for PS2?

I have a used PS2 and ever since Ive owned it I have noticed a background “static” that comes and goes. Previous experience says to replace the power tubes, which are Ruby 6L6 GCMSTR. I can just replace these with some TAD 6L6 GCMSTR’s I have already right? I’ve never replaced tubes in a Power Station before and just want to be sure there is no biasing that takes place…