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I use a V30 paired with a G12H30 and I think it is about the best sound you can get from a MkIV. And I have spent a lot of money on speakers to figure that out... BA

I play a lot of classic rock and blues: SRV, KWS, ZZ Top, Zep, etc. I mosty use the clean and crunch channel. I don't use the lead channel too much in my band situation. I get evrything that I need on the first two channels along with my peddle board to hit the front end a little when needed...

I tried a lot of speakers in an attempt to like my MkIV head. When I paired a V30 with a G12H30 in an oversize Bogner 2x12 cabinet, I found ever tone that I ever wanted out of an amp!

One trick that works pretty good is to replace the 12AX7 Phase Inverter tube with a 12AT7 tube. Try to get a matched 12AT7 - They do sell them that way if you request one. The 12AT7 is a little lower gain than the AX tube. Therefore, the signal that finally gets to the power section in not as...

I have got the same thing going on with my late model Mark IV. When I am groovin' on an open G chord, I get that same ringing in the background of the chord. I have swapped out all of the preamp tubes one-by-one with no change in the ringing. I play Strats - Although, one has a HB in the bridge...

I have tried several speakes because I never really cared for the C90 or the EV. I know a lot of people like them; but they just had not personality IMO. I did not like many of the speakers that I tried that had high power rating +75 watts. They were just too clean. I did like the Emimence...

So true! I have had four different MkIV's. I sold the first three because I kept searching for my sound. I went through Bogner's (WAY over priced), Budda (Nice clean but the drive side just didn't do it for me.), Roadking (Yuck!), etc... I came back to the MKIV each time and currently have no...

I would really be interested to know how you mod turns out. Maybe you could post a "How-To" or some pic's on this thread when you get done. I may want to do it to my MkIV also. Please let us know!

It has to do with the plate voltages that the 6v6 tube sees. The way that Mesa designed the amp, the plate voltages fall just within spec for most 6V6 tubes only when the amp is in Simul-class and tweed. I think you are also supposed to run the 8 ohm speaker/cab into the 4 ohm output jack to...