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I will try to check the part number this weekend. And get some measurements Has anyone here experimented with different transformers?

I have got to get it out of storage to measure the voltages. The transformer is a mesa replacement. At the time of the repair, the Mark 11B was still the current model. So I veleive there were only 60 and 100 watt transformers available. I'm 90% sure that it was stamped Mesa or Boogie on the...

I am the original owner of a Mark IIB, 60 watts with Reverb, with EV Black speaker. Playing an outdoor gig 20 + years ago, my power transformer blew. It was replaced by a MB authorized repair center and a new Boogie transfomer was installed. After the install the amp didn't sound as "sweet"...