Mesa Boogie Mark IV gain going in and out??????

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MetallicaFreak65

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Today when I was playing my MK IV I was on the lead channell and it sounded like the gain was going in and out like from really heavy gain to like hardly any and now the lead channel sounds a bit flat and not as aggressive. I'm not sure what it is mabye preamps? Can someone please help me.
 
get some pot cleaner and clean your lead drive and lead gain pots, and spray out those fx loop jacks.
also check the 1st 3 pre amp tubes.
 
How do the other channels, R1 and R2 sound? According to the online user manual, if it is a preamp tube, it could be V2,V3, or V4 if only the lead channel that has the issue.
 
I dont think its the pots because before I bought it alot of them were replaced and cleaned and I dont normally use the R2 so i couldnt tell you that but the clean doesnt seem any different just the lead
How do I test to see if the Preamps are good or bad?
thanks alot guys for your help
 

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