Quoted from Patofnaud:Oh they lit alright. Like a flashbulb. Before they went POOF. That circuit is solenoid voltage, not GI. You can modify the circuit, but it is a lot easier to just use these http://cointaker.com/products/37544471-b113-419c-8897-cab636ad6b8a . I like the green ones.
As for what transistors to use, they are most likely MPS-U45 as that is what Gottleib used in all lamp drivers of that era.
I modified my Black Hole circuit (Possibly similar) in roughly 15 mins. There is a pinWiki guide, but it doesn't reference HH.
http://pinwiki.com/wiki/index.php?title=Gottlieb_System_80#Replacing_Black_Hole_Lower_Playfield_Illumination_Lamps_with_.2344_Lamps
Once done, you can replace with any LED. No worry about using the special hi voltage bulbs. I like the ability to add different colors.
PinWiki sys80 is awesome
http://pinwiki.com/wiki/index.php?title=Gottlieb_System_80
4.13 has Aux Lamp board problems
Shakopee, MN
