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Could clean it up with some 99% alcohol and Q- tips. Are you sure it’s overheating? Maybe the electrolytic caps are leaking on to the board?

Again my ms-12 is very old UPDATE - Back to the MS-12 -less bass, more top end, a little more higher mids then the Lead 80 - went back and forth very close between the two speakers. The MS-12 breaks up sooner then the lead 80 but could be the age difference. two great speakers for this amp IMHO

IMHO, after playing both, the Lead 80 is better - now also my lead 80 is 1yr old, with minimum hrs and the MS-12 is from 1982, with countless hours. So not really fair. Another thing in the lead 80's favor - I dig saving the weight savings.

Best sealed 2x12 I’ve used is an old Marshall 1936 model- it’s a little oversized for a 2x12 so it sounds nice not compressed or boxy

if you have a bunch of tubes laying around- roll away- I just wouldn’t buy tubs to roll not worth it IMHO

I agree to disagree with you - that’s fine it’s all subjective stuff. I’ve done this stuff with tubes and it gets expensive.

Just realized the 1982 MKIIB has a original MS-12 speaker - it sounds fine but, I have a Classic lead 80 celestion laying around. So I already swapped the two speakers and don't really hear a difference? From what I've read the MS-12 150 watt was made by eminence back in the day. The Ms-12 is...

Power tubes not so much - preamp tubes are your biggest change IMHO

IMHO the power tubes don’t change the tone much - I just want reliable power tubes - the change in tone is in the preamp - IMHO

V3 pin 6 - that’s the one in question right?

Do you have a DVM to read the dc voltage on V3

I would start with the preamp tubes- do you have an extra one to swap in - one at a time to check each 12ax7 ? It could be anything but a lot of times it the tubes. You can gently tap the tubes ( all tubes ) while the amp is on to see if you hear it. Good luck

was just messing with the .47uf value. that seems to be a great match, everything works together nicely - im not fighting to much bass on the lead drive but not enough bass on the clean - the pull bright on the lead master sounds great too. Going to play it now for a couple of days- see how it...

It’s great to get pics and values- I’m going to get as much information as I can and post here for people to use. I was on this forum years ago been away for awhile-

It’s not that - it’s all the different values out there - from Mesa - I believe you - look at my amp 22uf this amp is .47 both the same circuit board two way different values. It’s good to get this information. Thanks very much for all you help on this - hope you’re not mad at me?

Thanks so much- mine is 22uf i think way to much bass - Mesa is all over the place with this stuff

Thank you - do you know the value of the cathode cap on v3b ? I’m pretty sure it’s 22uf but just confirming- again thanks for the pic

it be nice to get pictures of all the different versions out there. here's a MKIIB 9A board similar to my 9C

yea it looks lie my amp is stk I found a couple 9C boards wired the same way here's another one just like mine -

This one looks like mine