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I’m a Mark series fan. I’ve tried multiple amps from high dollar diezels to orange sludge, and everything in between. Admittedly, I...

I like the 12AT7 in the V4 position. Just takes a little of the "graininess" out of channel 3. Note: it reduces gain also, so you have...

You can apply this to any model year of the Mark V90. The V4 has the most effect. I tried the V6 but thought it reduced what I liked...

Close enough... If you're using a Road King, it takes the impedance without any issues.

The Output knob does do that but it goes from barely audible to way too loud to play when others are asleep with the tiniest adjustment...

Thank you greatly for this detailed information. I will try your suggestions. Roger

You can apply this to any model year of the Mark V90. The V4 has the most effect. I tried the V6 but thought it reduced what I liked...

I like the 12AT7 in the V4 position. Just takes a little of the "graininess" out of channel 3. Note: it reduces gain also, so you have...

Here's a few pics of the limit to presence control mod. I used a 250 audio taper pot, and also had an orange drop in at first, then...

I still use the floor the amp is resting on. Since I do not use my Mark V90 much anymore, it has not been an issue what effects I...

I am not all too familiar with the Mark amp you are working on. To actually find a schematic that is legible is probably more...

You can apply this to any model year of the Mark V90. The V4 has the most effect. I tried the V6 but thought it reduced what I liked...

For a long time I have been hooked on Carvin Guitars dating back to 1999 when I found a used one at a local guitar shop when I lived in...

Does this apply to all years of the Mark V 90W or just the early years? Also, which of the 2 tube swaps did you find most useful...

Over on The Gear Page, the Fillmores get a lot of love. I have a 50 combo, and a 100 head & 2x12 cab. They are both here to stay. In...