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Before Overhaul After Parts Mesa Replaced Should be good for another twenty.

Last week I shipped them my 1991 Mark IV for overhaul (tired of the broken off knobs). So original ... estimate was $150-200 and about 2 weeks. Rich said the Tech tells him it needs more: Filter caps New Reverb Tank (I knew it had a broken spring - still worked) 12AT7 Tube (I had a 12AX7 in...

For the first time in a dozen years I am without my Mark IV and am using my old Red Knob Fender Twin (my former mainstay before the Mark). The bands says we just don't sound right - something major is missing. Everyone noticed. Its so remarkable on how much that Mark IV makes my sound what it...

Is there a way to switch between the amp channels if my foot switch happened to die at a gig? Just curious - I like to be prepared. All flamers welcome.

Recently re-tubed the amp with the "Mark IV Premium Package" from thetubestore. Its the 7025/=C= 6L6 set up. Did this to base line my amp before resuming my NOS tube rolling. Sounded pretty good I must say. So I pick up a set of new Electroharmonix EL34's at a music store and throw them in the...

I'm in one now. The music is great, lots of gigs, developing a good following, enjoy the hell out of it but.... One guy always has to be every ones boss, always right, loud and talks over anyone trying to say anything, often rude and condescending, overly critical of band members even on...

Bought a crap load of NOS of various kinds and started rotating them thru the Mark IV. Then last gig the amp started cutting out and acting goofy. I realized that I really had an un-known collage of tubes in the thing ever since I bought it used 15 years ago. Mix of Mesa's, Groove Tubes from...

If I were to send my Mark IV all the way to Cali for an over haul - anyone got an idea of turn around time? Gig a lot with this amp - it would be torture to live without it. Comments appreciated.

after a year of listening to me rave about the virtues of my Mark IV; our band has gone all mesa now. I have the Mark IV forever now. Guitar player eventually chose a 5:25. and got rid of his cheapo fender mushy machine. Bass players ampeg went tits up and he showed up with a brand spankin...

Just tried some advise someone around here mentioned a few times. Setting the Main Master Output MUCH higher (5-7 range) and setting the channel masters much lower than I usually do (3-4 range). Wow - different amp! I have real control with R2 also! Ten years I own this thing and it still...

After spending quite some time on this board and other places reading about the "virtues" of the great NOS tubes; I went to "stealbay" (probably a big mistake) and took the plunge investing something like $350 on a bunch of "NOS". Heres what I got for my Mark IV (a/b) baby: 1-12AX7 Mullard...

So i dunno about you......but, with me; the mark IV output knob is a bear to deal with. First it has slop in it so you can turn it some distance before it actually engages the shaft and causes rotation. I can probably fix that with a little TLC i suppose. The real issue is when the shaft does...

Hello everyone. New poster here - owned a 1991 Mark IVa for a dozen years now. Must say I LOVE this amp. Anyway; I Have a Mark IVa, I have the owners manual from Mesa - they dont match of course! Jack layout/tube layout/etc dont match the pictures! 2 questions: Is there a manual for a Mark...