Recent content by RussellG

Thanks everyone for the suggestions. It felt like I was chasing my tail trying to fix the problems so I decided to sent it out for service.

Well I'm back with bad news. All new tubes, Deoxit on all the sockets, still having problems - volume increase/decrease and with crackling noise. The volume changes seem less severe than at first, but still not ok. I'm seeing that the first Volume knob (far left looking at front of amp) has...

Hey thanks, it's been played a good amount recently. I was thinking it could have been crud in the sockets and my changing tubes and wiggling them was really was fixed it rather than a new tube. Because.....I put the suspect tube into my old .50 caliber, and it's working fine. Also, I noticed...

Thanks Henz, it was happening before I replaced the power tubes with JJs. For those following the thread, there actually is no V4 tube, I'm guessing because there's no reverb with the amp. Which means 100% of the Lead Drive is from V3, which is interesting in itself. I swapped a known good...

Thanks, yes that all makes sense, I've had to replace power tubes many times over the years but never pre-amp tubes. I guess it's about time for that too. I'll get back to this thread for an update once I try that out. Thanks again.

Dom, thanks for getting back and thank you for the welcome. I have a II-C Maintenance & Repair doc. As far as I know it's all stock. So in the Front Row it lists "Junction: Preamp to Pwr" (no tube listed), then it has a12ax7 in each of V4 (B:Reverb Driver, A: 1/2 Lead Drive Amp), V3 (B: 1/2...

First post here so please allow me some slack, hope to be able to pay it back in the future. I have a Mark iic+(signed) 60/100 no reverb. I'm a Mesa fan 40 years now, this one is by far the best. When it was prime, wow. Played out with it for 20 years but now it's not happy. New JJ tubes today...