I have had this amp for a few weeks and it sounds great. I want to try some different EL34 tubes to see how they sound. I am very used to biasing Marshalls and similar amps, but can't quite understand the MkII.
I dropped the chassis down and looked for a bias pot, but there are none mounted on the board. As I was putting the chassis back in I noticed some cutouts with the adjustment screws and leds next to the power tubes. The leds are green and red, with the green ones shining right now. There is also a 3 prong connector next to the leds. All of this seems like the bias on the MkII can be set without dropping the chassis - which is a great feature. Unfortunately, I can't find any documentation on adjustment screws or the connector.
Any instructions will be appreciated.
Thanks, in advance
*** I meant to add that