I have a 69' Marshall 50 Watt Metal Panel that seems to have a bias problem. The B+ voltage is 385 volts, but I can't seem to get the El-34's above 30-32ma maximum. It does have a non-original power tranny, (1202-324 which was a later 70's Marshall transformer that supposedly puts out about 450 volts) so I'm kind of wondering where to start looking for the problem. I've tried 3 different sets of El-34's and they all yield the same approximate readings. From what I remember, I used to be able to bias at about 46ma or even higher. Whats wrong?