I would suspect the output driver (TIP) on the SDB. Check it, and take a close look over the SDB.
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Check out 5.7.2 and 5.7.3 in the link below. Hope this helps.
https://www.pinwiki.com/wiki/index.php/Bally/Stern#Testing_and_Replacing_Transistors
Quoted from GPS:those with far more experience than I have suggested verifying that the coil was not shorted
FYI...if the coil was shorted, then it would not lock on. Instead, if it was shorted you would fail a part upstream like a fuse or transistor.
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