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My TOV had a treble pot that wasn't working right. I went the TOV manual and found the Mesa POT part # and ordered from their website. Very inexpensive, shipping was more than the cost of two POTs. Before I ordered, I tried hitting treble POT in question with contact cleaner and there was no...

From Mesa's September 1996 Price List - Tremoverb Head - $1,599 Tremoverb 2x12 Combo - $1,799 Matching Horizontal 2x12 (V30s) - $499 Heartbreaker Long Head - $1,499 Heartbreaker 2x12 Combo - $1,699 Matching 2x12 3/4 Closed Back (C90s) - $499

I read in another post somewhere that someone with same problem - volume pot. I have similar issue with my 2:90, haven't pursued any fixes yet. If the pot isn't sealed, I going to try contact cleaner first. It took a little troubleshooting to figure out. It only happens on one side. I started...

Does anybody know if this is this a factory install or a mod?

Thanks Triaxstasy! I'm going look into getting them replaced. Have you had to do cap job yet?

Maybe someone can point me in the right direction- The volume will suddenly jump up either channel randomly. I know it's not the preamp, I switched preamps and the issue remains. The power tubes don't have many hours on them. Am I looking at a cap job? I have swapped the 12AX7s, could they be...

I had the amp serviced and asked the tech about the resistors - they change the bias to cathode.

I have a 78 Mark I that was humming with and without reverb turned up and nothing plugged. Only annoying when I stopped playing. I'm thinking 30+ years old, probably needs the preverbial cap job. I wiggled the reverb pan cables, bam! Bad reverb pan connection, no hum now. YMMV

Thanks for the clarification JMMP!

I must have an older 2:90. The layout for speaker/input/mode-switching jacks do not match the illustrations and the power cord is hardwired. Are there any EL34 options for older 2:90s? Thanks!

Thanks for the info! I'll have to try the 6L6/EL34 mix sometime.

Thanks Triaxstasy, Which tube sockets do the EL34s go in?

I have a 2:90 as well and it has the same tube layout sticker in the back, 4x 6L6 for A and 4x 6L6 for B. How/what do you have to do to use EL34s?

I recently acquired this 1978 Mark I and it sounds great. I have a couple questions about the rear panel - 1. There's a switch on the right hand side conneting the a resistor network. Does anyone know exactly what it's accomplishing? 2. What is the jack above the Slave jack used for...