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I took 2 EV's out of my old Music man and tried to put them in my Lonestar and they did not fit, the magnets rest on the reverb tank.

I put GT 6l6-s-gold series grade 4 in my Lonestar and they changed the sound of the amp,the amp seems cleaner and I'm not sure if that is better.I'm trying to play it for a few weeks and make a decision on it.I think they are rebranded JJs. Maybe I'll get 8 months out of these.

I see that you have a Lonestar,I too have had nothing but problems with Mesa tubes in my Lonestar,I get 6 months out of them max. I switched to GTs this time, I want to see how long these last.

That little 6l6-el34 switch is the first thing I check when I take the cover off. Have not found anything wrong with the amp and went ahead and put groove tube 6l6-S-grade 4 tubes in and I hate them, I think they are rebranded JJ's. It does not have the gain it had before and I think I might go...

Thank You!

I use it 10 to 15 hours a week and always use the standby on breaks, I have a tech working on it now and he says the tubes are bad once again. I was thinking maybe I'm getting crap tubes from Mesa and I ought to change brands.Would bad tubes blow the screen grid resistor?

I have a 2 year old Lonestar classic that I am really getting tired of replacing tubes in (mesa 6l6 red) twice in 18 months! Now I have to replace again plus a blown grid resistor, any thoughts on Groove tubes and reliability issues?