You used the wrong diodes on the coils, you should have used 1n4003 or higher not a 1n4001. The diode has shorted which may have shorted the drive transistor and then the high current draw has caused the jumper resistor on the aux power supply to go open. Since the jumper w-6 is now open you have no power to any of the 50 volt coils.

Sorry it sounded like you used a 1n4001.

The diode on the melted coil could have been bad from the start, thus causing the melt down of the Tip 36 and the coil.

Your meter is showing voltage at the coils, but I have seen the jumper bad but still show voltage.

Just so we are on the same page, Q-1 reads 3 volts with J-1 connected and reads 76 volts when J-1 is disconnected.

If you haven't replaced the coil yet, you wont see the 76 volts. The voltage has to go thru the coil back to the TIP36a.

What size fuse do you have installed? Do you have the diode installed correctly?

F-4 should be a 2.5 amp slow blow fuse. A TIP36a transistor can handle 40 amps surge, 25 amp continuous. Why didn't the fuse blow? How large is the fuse?

Check both ends of the fuse. List all numbers you read.

Manufacture is Bussmann
250 volt max.
MSL is a time delay fuse.
5 is five amps.

Time delay and slow blow fuses are the same. In the time it takes a slow blow fuse to burn the current can rise very quickly, that is why you can't over fuse.