Threshold 400A fuse holder needed

Good morning I recently picked up a threshold 400 an amplifier. The rail fuse holder has broken and I'm wondering if anybody has a part number? Hopefully it's just something as simple as it grounded against the chassis and popped the fuse, but who knows? I am equipped with an oscilloscope, signal generator, Variac, DVM and my son is an electrical engineering major so it would be great to see if we can get this thing going!! Thanks.
 

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So the fuse holder showed up and I soldered it in and it's a perfect fit. For $2.50 it was a bargain. The prior owner had the wrong line and rail fuses, so corrected all, then powered the unit up with a Variac. The left channel pegs at start up and produces 59 V DC at 120 V line in. The right channel is good with 27 mV at 120 V. Seems like a shorted output transistor??? but would like to know if you guys would think of anything else? I will look to change the electrolytic caps as well. Thank you, Doug.
 
Morning! Can each output transistor be individually tested using an ohm meter without desoldering them from the circuit? The attached pictures indicate 4.5 ohms on one row and 2.5 or so on the other row there is one output transistor that tests noticeably lower .7 ohms, maybe that is the bad one causing the left channel to peak at turn on and throw the DC voltage? Any help you guys can contribute is appreciated. Thank you.
 

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Evening DIY group. So the work continues, as the large can capacitors were replaced, and cleaned up the unit hoping to one day get it operational. A picture of the 1 output transistor which tested low at.7 ohms is attached. All 26 resistors tested same at roughly 1.5 ohms and none were split or burned. Lastly, when looking at the PCB, 2 of the resistors??? are partially burned, and need to be replaced, yet I could use help on part numbers, if someone can assist?? Thanks.
 

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