On the top plate in front of each 845 tube there's a bias pot and bias switch, all you need to do is let amp warm up about 10 mins, flip bias switch on for one tube , use small screw driver , turn bias down to zero and then up to 75 - meter is on front of amp, flip switch back off, do same for 2nd tube and all done - all down. Takes very little time . .LM recommends checking every 150 hours.
CAmp also as a hum pot in the event an 845 hums you can control it. Haven't has that issue in 18 months of having the amp and using it fairly regularly
CAmp also as a hum pot in the event an 845 hums you can control it. Haven't has that issue in 18 months of having the amp and using it fairly regularly