I located a source for the adapter and the plugs. My links to the plugs and supply were deleted, so I guess anyone wanting the info will have to send me a PM.
You can buy the adapter cheap, but it has the wrong plug. The correct plug is also available cheap. You will have to replace the plug yourself.
The "adapter" is nothing more than a transformer with a center tapped secondary. The adapter is rated at 17.5 volts ac, but actually puts out 19.5 ac across the secondary. The voltage readings in my picture are approximate and were taken with a super cheap meter. The current rating is 0.7 amps.
After opening up my broken supplies, it appears the transformers themselves are bad. That doesn't speak well for their quality. Or perhaps I shorted out the secondaries doing something stupid like measuring the voltage. They are over twenty years old, so who knows?
Note that the plug is NOT a standard 5-pin DIN (like a midi plug). The pins are spaced in a 240 degree arc instead of 180 degrees.
The Mitigator will not accept phantom power.