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Music Reference RM9mkII Driver Tubes

Posted by Berrell88 on August 21, 2020 at 14:09:41:
If it ain't broke, don't fix it. The driver tubes, Sovtek 6922's from Ram Labs, have been in this amp for at least 10 years. Decided to experiment by inserting a matched pair of Teslas NOS from Tubemonger. This resulted in loss of the right channel. I reinserted and even flipped the four driver tubes in the amp and nothing changed. No fuses blown. Now I can't null out the balancing LED's for the two key drivers, the V1's. Wondering if I just simply need to replace those two critical tubes.

The RM9's obviously don't like input tubes other than Ram Labs but I've read about other owners using NOS, etc.

Any suggestions? Thanks!