It may be a tube,and not just an output tube.the6922 driver tubes factor in as well. Check your bias.The front push button,hold down and turn the trim pot so as there is no noise.The backs so the light burns med;not its brightest,nor dimest.The front so no sound when depressing the buttons or when you let go.I prefer the GE 6550.It came with a wooden screw driver,so you don't damage the trim pots,be careful if you use a metal one,(light pressure) You got a great amp,enjoy!
EL 34 tubes
I have recently purchased a Music Research RM9 MKII. I would like to find out what brand of EL34's is working best for this amp. Currently I have Siemans in it now and I don't know how many hours are on these tubes. When I turn the unit on there is sound coming out of the right channel until the tubes warm up. The unit plays perfect after warm up. Thanks Richard
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