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I have a Marshall 5213 MOSFET Amp (1986-88?) that I can not power up.  All knobs to min settings, speakers hooked up OK, no guitar or pedal inputs, keeps blowing the 1.5A fuse. (The fuse glows like a lightbulb!)

I bench checked both circuit boards (both sides) -no physical burns, all solder joints look OK, no discolored components.  Checked the reverb box (coils/components) -- OK.

I unsoldered the secondary (output) of the transformer, the fuse doesn't blow and I have both AC voltages available.  I lifted up the rectifier quad so that the output was off the PCB and checked the DC out and it is OK, fuse doesn't blow.

I removed the 2 MOSFETS, tried checking and I thought I found the problem.  I was able to find replacements on eBay, purchase and installed -- Blew the fuse AGAIN!

I was able to find the schematic.  This is a project AMP that I paid $45 for --with the MOSFETS, I'm into it for $70.  The 2 Celestion 12" speakers (and the cab) are in perfect shape and worth more than that, but I'd like to get this baby working as the specs and features are awesome.

Aside from taking this into a repair shop or parting it out, any ideas on what could be blowing the fuse?

If you are a repair shop in the San Francisco/Bay Area -- let's talk.

Marshall -- If you are out there, I sent you an email about a week ago on this and never heard back.