Service manuals and schematics are at pinwiki.
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From pinwiki:
Transistor S6 controls the right thumper bumper and is driven from IC Q203 pin 7.
Further suggested reading:
https://www.pinwiki.com/wiki/index.php?title=Bally_Home_Models
I don't have any experience with the Series 1 Bally home models. My experience is with series 2 Captain Fantastic.
I think you want the transistor at location "C1" on the game board. It can be any one of the following PNP transistor types: TIP145, SE9400, 2N6040.
Sounds like the wiring to the coil is connected incorrectly to the diode on the coil. This will destroy the diode and the driver transistor.
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