Quote Originally Posted by marnold View Post
Is there a design reason for the circuit board to be oriented that way? I'd think that the speaker would rattle that thing something fierce.
The chassis is a good thick grade of sheet metal and is anchored in place in the cabinet very solidly, and the PCB is securely bolted to the chassis, so I very much doubt that will be a problem. Besides, Fender uses this set-up extensively in their PCB-based amps, so I think it's a design that's well proven.

The advantage is the ease of service--pop the rear cover off and you have good access to everything. No need to remove the chassis from the cabinet. For example, re-biasing the power tubes after I changed them last night was a snap.