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Yes, all Mesa power amps have a preamp section, and act just like a super clean amp.

I ended up putting a 180ohm 4w resistor on the positive lead to the fan, and replaced it with a PC power supply fan (ADDA brand). It moves a bit of air and is almost silent.

Technically you could put another A/B between the existing A/B and the Mesa, and it could control the signal for each channel on the Mesa.

Should work great, you need a stereo signal to use both channels though.

I'm confused? How are you runnig a 5150 (or whatever is available) through one side of the 2:50? You can't switch channels on the 2:50 itself, you can have a device mute the signal going to one side or the other, which would have the same effect.

Run a mono signal from the Preamp output, into the 5153 FX return jack. Be aware the volume on the Pre will control volume, the controls on the 5153 will do nothing, and it will be as if the master volume is wide open.

Love this amp, it's just too hot and fan too loud for my needs. So I'll take her back to GC. Just ordered a 2:50 from Mesa Hollywood to replace her.

You can get a good tone even at very low volumes from all Mesa amps, it just rquires some tweaking of the controls, and setting them with your ears, not your eyes.

OK, so the mini toggle replacing the jack is a no go, the jack is mounted on the I/O PCB with the rest of the jacks. I made two solutions, one is a a 1/4" TS plug with the sleeve solder point cut down to about 1/4", and folded on top of the tip solder point, and soldered to it. I then glued two...

The 2:100 is made for it, with dedicated Recto Preamp inputs and modern mode jack. The thing is an absolute beast though. I thought the Recto pre sounded good with my old 2:50, but I would think the 2:90 would sound better than the 2:50. The 2:90 is also the most feature rich Mesa power amp. The...

Possibly a thermal conductive resistor or part of the PCB becoming comductive under thermal stress.

If that's the case, I think I'm just going to pull the jack off the panel, leave it hanging inside with a TS cable plugged into it (heat shrinked of course), and wire the cable end to a mini toggle, and mount it in the hole.

So it just uses an open/closed signal like a footswitch?

Is there a way to engage it without a Triaxis or Recto preamp?

Deoxit all the jacks and pots... https://www.amazon.com/Hosa-D5S-6-DeoxIT-Contact-Cleaner/dp/B00006LVEU

Get at least one good 12AX7 to swap in each position for testing.

Any tube can become microphnic, and despite what people will tell you, all preamp tubes can cause feedback when microphonic, even phase splitters. So start swapping out preamp tubes in both, with a known good tube, until you find the culrprit. Also a bad pick up in your guitar can cause this as...

Yeah, my first was a 2ch Rev G Tri-Rec I ound in a pawn shop for $699, walked out with it for $642. The build quality on those was insane, almost as good as a point to point. I regret selling it now, even though it lead me to my current rig, it was a special amp to me and I would love to have it...

Yeah, most big touring bands use rack rigs backstage with iso-cabs. A lot still use tube amps and pedals chains, just racked and maybe a backup amp in there that's not used. Then in ear monitors of course.

Which is why a slant 2x12 or 4x12 is important as well, or tilting back your combo. Projection adds a lot to sustain and sensitivity.