Music Reference RM9mkII Driver Tubes

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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!

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Topic - Music Reference RM9mkII Driver Tubes - Berrell88 14:09:41 08/21/20 (9)

Time for the pencil test - airtime 06:49:08 08/22/20 (2)

RE: Time for the pencil test - Jonesy 11:19:12 08/22/20 (1)

RE: Time for the pencil test - 6bq5 15:01:52 08/24/20 (0)

If all else fails, check the circuit board traces for the 6922 tubes - garymuffley 16:48:20 08/21/20 (0)

RE: Music Reference RM9mkII Driver Tubes - Blackdog 14:51:06 08/21/20 (4)

RE: Music Reference RM9mkII Driver Tubes - Berrell88 13:55:45 08/26/20 (0)

RE: Music Reference RM9mkII Driver Tubes - Berrell88 15:51:22 08/21/20 (2)

RE: Music Reference RM9mkII Driver Tubes - Jonesy 23:20:04 08/21/20 (0)

RE: Music Reference RM9mkII Driver Tubes - Blackdog 16:57:38 08/21/20 (0)

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