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Oh by the way the amp is 1985 Mark 3 black dot...though during the mid 90's I was going through many, many power tubes so I called mesa and they recommended that I have a smaller transformer installed....having no technical skills or understanding of the ramifications, I agreed and they sent me...

So here we go...this is the description of the repair from John Littlewood certified life saver... Paul, When I powered up the amp on the bench it had no sound from the get go. I moved the pre tubes a little and then the volume rose up. But after only a few seconds it slowly faded back out...

Yes, but that did not help...thanks

Out of frustration I've sent it to a boogie certified repairman in Lansing NC (John Littlewood, who has been very helpful in the past. I'll post the results. Thanks for your suggestions. Paul It sure is painful to gig without it!

What did you say???...p

More info, got home switched in some different power tubes and pre amp tubes...sounded great for a night...next night the volume issues continued... cycling from normal volume to much lower volume and back over a matter of minutes....tubes look fine, no smells...when the volume is cycling low I...

Thank you, at this point I'll try anything.

Thank you, I'll give it a try. Some additional information is: I had this problem about 6 months ago and had it gone over thoroughly by a certified mesa tech. He consulted mesa and they thought it was a tube issue, I've been through many tubes without success. Here are some of the possibilities...

I have an early model mark 3, recently (last night on the gig) I had an issue with the volume fading and then returning in all modes, eventually I had no volume. I switched pre amp tubes 1 and 2 but that did not help. After the amp was off for a few minutes it worked when turned back on but...