I recently picked up a used 2204 (2012 model).  I dropped in a pair of SED EL34s, and did a bias check (via Bias Rite); results were 31-33 mA.  I would have liked to bump it up to around 35mA per tube.

Reviewing the layouts, I cannot find a bias pot anywhere....does the amp have one, or is it just a resistor?  If a resistor, can someone tell me which resistor would need to be changed?  Suggestions for what resistance to use?

Thanks in advance.