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I'm just about through refurbishing my Bally Star Trek but my new bulbs keep burning out. I've replaced everything in the machine with #47s. I've played probably 20 games while I dial it in an have replaced over a dozen new bulbs both controlled and GI. Voltages are correct, GI bus measures 6.65V (schematic actually calls for 7.3.) Nothing is extra bright or anything, bulbs look normal until they just go out.
Did I just get a bad batch of bulbs maybe? Any other ideas?
Quoted from aerobert:Did you try replacing with regular 2W 44's?
No not yet.
Quoted from schudel5:I'm going to guess bad batch. Where did you get them?
Pinball resource.
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Gilbert, AZ