Shaq ...could be bad tubes; could be blown bias resisters. Switch "good" tubes into the sockets that read 20 mV. If the bias stays at 20 mV, that's a good sign there's a blown bias resister. If the bias can be adjusted to 65 mV and the problem moves with the tube, it's the tube.
I find it odd that both channels present the same problem. Try the diagnostic technique I suggested and report back. Do you have any spare KT-120s. If so, you might need them.
Hopefully, the problem is just a bad tube or blown bias resister. If a blown bias resister, I would ask Kal (ARC service rep) if there's an authorized repair center near you. I would avoid shipping the amp for a simple bias resister repair if at all possible.
Rather than me whining on, try what I suggested and report back.
I find it odd that both channels present the same problem. Try the diagnostic technique I suggested and report back. Do you have any spare KT-120s. If so, you might need them.
Hopefully, the problem is just a bad tube or blown bias resister. If a blown bias resister, I would ask Kal (ARC service rep) if there's an authorized repair center near you. I would avoid shipping the amp for a simple bias resister repair if at all possible.
Rather than me whining on, try what I suggested and report back.
