Crown D-150A series 2: help

Here ya go!!
https://www.parts-express.com/cat/fuse-holders/1423

For now I can't turn it on because it's missing the fuse 6.25A MDX (easy to replace). The bigger problem is that it's also missing the fuse holder:  part # C5597A5

Should really be bought back up very slowly with a variac and monitored with test gear, at a few different points 
It will be very good luck if it powers up and works, they are probably missing for a reason, should be looked at by a tech first before re-powering again, because even more damage could happen, if you want to keep it and get it fixed.

Cheers George    

Before you install fuse holder, use a 150Watt incandescent light bulb instead of a fuse, power up the amplifier without speaker connected, if the light bulb light up a second then dim down, the amplifier maybe still in working condition, next thing to check is DC voltage at output, if less than 50mV, then it is safe to install fuse holder and connect speakers for sound test.
If power up the amplifier the light bulb light up continuously and not dimming, then the amplifier need to be get fixed.
https://www.homedepot.com/p/Leviton-Weatherproof-Socket-Black-R60-00055-000/100356874
https://www.wikihow.com/Measure-DC-Offset

Well I would have left it right where it was, make sure your outside when you plug it in!