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Nae bother! I just noticed that the picture of the graphic EQ in your original post looks almost identical to how I used to set the EQ on my Mark IV when I was in my old Death Metal band (called Live Burial - you can hear the tone very well on our first album 'Forced Back To Life", I used a TC...

Hi, I didn't do the Master Vol repair on my amp but I did do basically the same with the Lead Fat control (to be Always On). Basically the existing control will have 5 wires come off it, three for the usual pot controls and two for the switch. swap the three pot controls to the new Master...

Should be an easy fix as long as you're careful with the HV inside the amp being absolutely safe. I have broken most of the push-pull pots on my Mark IV and fixed them in a variety of ways (disabled the Pull Silent on the Master Volume control, hard-wired the Lead Fat ON as the knock that broke...

I have a Mark IV and I think all of the push-pull pot shafts apart from the ones on the Presence controls have snapped after very minor knocks - annoys me so much that vulnerable parts on such an expensive amps are plastic. I managed to drill, pin and glue mine, but the Lead Fat switch was...

Hi folks, apologies for resurrecting an old thread but I have some observations which will hopefully be useful: The Studio Preamp is one of the best pieces of gear ever made! I got mine in about 2010, it was made in the Spring of 1990; it's needed a bit of TLC every few years but if anyone...