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:D Thanks for the input. I will try a pre-amp tube and see what happens. I want to re-tube the amp, I just need to figure out what tubes to get. I got SV6L6 and Mesa pre-amp tubesin it now. I would like to try some different ones but there are so many on the market and alot of jabber about all...

:lol: No I am not turning the std by switch on and then the power,,,,,,,, I bought this amp in 1994 new and have been using it sinse. I have been playing guitar for 35 years, I don't think I would make that mistake,,, haaaaaaaa :lol:

:( My MK IV is acting weird !!!! I turn the amp on stand by to let it warm up before playing 4 to 5 min. When I turn it on the amp acts like it is not warmed up, the volume slowly comes up, it is distorted and sounds like it just ate at McDonalds. The sound will eventually clean up and act...

Thanks guys for your input, I have always bought from mesa and want to try something different. As far as bias as you know the mesa mk IV is fixed and can not be adjusted, I talked to one of the guys at EURO tubes on a bias modificationon for my amp and he told me that it was really not needed...

:!: I am re-tubing a Mesa MK IV,,,,, to many brands to choose from. I have used in the past Mesa 6L6GC and presently using SV6L6GC, I am thinking on trying the 6V6's. I want a killer tone and need some help on what kind and which brand to choose,,,,, tired of asking tube companies, they give you...