In my ARC VT-60 I use EH 6922 and SED 6550 tubes; it is a wonderful combination! I think that your VTM 120 amps are the mono version of the VT-60, if so I don't think that you will be satisfied with the EH 6550 tubes.
Craig
Craig
Tube Rolling ARC VTM 120
Anyone done tube rolling on the ARC VTM 120 monoblocks? They use 6922s and 6550s. I bought a pair of these amps used 6 months ago; they sound great, but I am considering changing the tubes as I do not know how old they are. I'm considering Electo Harmonix as I've had good results with their 12AX7 and 6550s before. Opinions ?