(Topic ID: 267768)
Bally rectifier boards are almost always damaged/hacked/repaired. Looks like they moved the bridge rectifier and resistor off the board and tied it to the metal as a heat sink. Probably pretty robust now.
Olympia, WA
I took it off to clean, I suppose if I test it and it's good, I'll just put it back. Still, hate to see hacks. They used a couple of heavy wires to bridge traces on the back. Just two, both ends of the F5 Fuse, and looks clean. I'm not even sure I see an issue with the traces.
Quoted from KenLayton:If I recall correctly, that was done to keep the 555 feature lamps from burning out very quickly.
Interesting. I hadn't heard that.
Mine had the bridge rectifiers also relocated to the base, and same heavy wires. I was told it was a factory recommended fix as the base acts like a big heat sink. Still looks kinda iffy so I dropped 70 on a new board so I'll sleep better.
Quoted from KenLayton:If I recall correctly, that was done to keep the 555 feature lamps from burning out very quickly.
That was very common, but this looks like an operator bridge replacement.
The feature lamp mod only used half of the bridge to drop the voltage enough to take stress off the lamps and didn’t involve the cement resistor.
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