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Thanks for the tip. I cleaned the effects send and return jacks but, it ended up being my volume pot on my Les Paul. Thumbs up to the guys at Tube Depot for picking out a great sounding set of Winged C SED 6L6 and EL34s. These guys use Boogie Amps and know there stuff.

I sent my back to Mesa about 4 years ago and Mike put the r2 volume control on the back and did the mark III+ mods to it. Great amp.

Is this a expensive repair?

What could cause the volume drop on my Mark 3? I have tried new power tubes but, it didn't help. Could it be caused from a bad preamp tube?

Looking for a good source for tubes for a Mark III. Would like to get a pair of the SED 6L6s and SED EL34s. I have tried using Dougs Tubes and The Tube Store for power tubes with not such good luck. With Mesas fixed Bias it's picky on power tubes. Any suggestions. I've used Mesas 6L6 440s but, I...

Looking for the best overdrive to use as a clean boast or overdrive with a Mark III? Wanting something to use as a alternative to R2 for rhythm playing.

Anyone using a Fulltone OCD with there Mark III? Currently I have Been using a Xotic AC Boaster as a overdrive for a rhythm playing instead of using rhythm 2 on the Mark III. I tried the Fulltone OCD at Guitar Center thru a Lonestar Classic and it sounded killer with my Paul. Haven't tried it...

Just wondering if a plate current of 24.1 and 23.6ma will work with my Mark III. I will be running these with a pair of Mesa EL34 442s in the outer sockets.

I'm noticing a difference in volume in the channels on my Mark III. Could it be something as simple as the V2 preamp tube going bad, because if it where power tubes it would be all channels?

Looking for preamp tube suggestions for my Mark III Combo. I know this has been covered before but, I'm looking for fresh ideas. Also has anyone used a 12at7 instead of a 12ax7 in the phase inventer and R2 for a smoother tone? Thanks for your help.

Edward thanks for your input on this. Which RCA 12AT7s are you using and are you using them just in phase inverter and V2 only? Thanks.

Looking for ideas for preamp tubes to get a more aka Marshall type rhythm out of rhythm 2 on a Mark III red stripe. Any suggestions!

Are these the right ones. http://www.dougstubes.com/images/SEDEL34.JPG

I bought a set of the Mesa EL34 STR 450s for my Mark III and didn't like them a bit. Well maybe a little but, I think the 442 sounds better. Mesa no longer sales the EL34 STR 442s. Where can I find them?

It burnt a small part of the bottom of one of the 6L6 sockets. That is it the best I can tell. I looked inside and didn't see anything else. I think its just the bad EL34 that red plated the first go around. Thanks for your input.

Thanks for the info Boogiebabies. I hoped that I didn't cook my output transformer. Would it be safe to put a new set of output tubes in and try it again or should I just plan to take it in to the tech?

To continue on from my post about output tube glowing and hum. It seems like I got the problem fixed for a short time. One of the outer tubes (EL34s) would glow bright red in the center and the amp would hum. I found a broken wire at the tube socket and had it fixed. Well I used my old tubes...

Thanks for the input guys! I when out to store and bought a set of Mesa Boogie EL34s. Popped them in and let the amp warm up a bit and there I was back with the same glowing tube again. Its only on one of the EL34s, the rest of the tubes are fine. I haven't had a chance to look inside yet, but...

One of the EL34s lights up bright red and starts to hum. Time to replace the power tubes?

I have a Mark III Combo w/ 6l6/EL34s. One of the EL34s will glow and the amp starts humming. Once I turn it to standby and back on it goes away. Its happened twice now in the last couple of weeks. Could it be just the power tube going bad or something else?