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The power transistor is located on the outside of the case about where the black smudgy mark is on the image below. It's in a socket held in place with two small screws. Be careful with the mica insulating washer. There is also some white thermal compound present, don't wipe it off the mica...

Kenny, the replacement transistor is one that I happend to have on my work bench left from another project. There may be one or more laying around, I'll send one to you. Yes, I'm sure you can replace it easily.

Tinkered some more with the MEP-18 genset received from Kenny and at about 12:45 today, it fired up and ran beautifully until shut down 1/2 hour later. :beer: Not as noisy as I had thought at least not without loading the generator. Adjusted the frequency to 60Hz, voltage to 120 and measured...