If the coil was heated up, it may have an internal short, or the diode on the coil may have shorted out. Disconnect the diode, and the power lead to the coil, and check the coil resistance, and the diode function. I seem to recall that just about every coil in early williams solid states are 23-850s, which should have about 5 ohms of resistance. If the coil is shorted out, as soon as it is fired, it will take out the drive transistor.

You can find the resistance for your coil here: https://flippers.com/coil-resistance.html