Hello there. Just bought a used ampeg svt 2 pro. the bias 1 is correctly, Green Light and then Red light turning clockwise. and when amp is without signal, only green led is lit. OK The problem is with bias 2, it is red light and when I turn clockwise i got both up, red and green I read the manual and it says : Red comes on, Then green = Set Slightly before green comes on, obtain matched tubes when possible. I read many threads here on talkbass but didnt find anything about red then green, only stuff about green light didnt appears. I did some tests swapping the 12au7 from bias 1 and it didnt work! sorry about my bad english, Im not from Usa. Just spent a lot of money on that svt and im afraid! Thanks alot!