Cary SLP-05 Trim Pots

I’m new I need help. I have a (new to me) 10 year old Cary SLP-05. There are two (2) trim pot inside the chassis that has the tubes (not the rectifier tube). Are they to BIAS the tubes? It came with tubes but they are not labeled where they go. They are all Sylvania 6SN7-GTB.

I can match the tubes that’s not the issue. I just want to make sure they are BIASed correctly, matched and place to optimize their performance.

I’m new to Cary.

I sure could use some help.

Thanks