System1 Chime Board (Tone Board)
This is a repro of the Gottlieb Chime/Tone Board used in Dragons, Charlies Angels, Solar Ride, Countdown and Pinball Pool.
Different variants of the 555 timer chip do exist. ICM555, TLC555CP and NE555TEX are reported to work; the NE555DIP will NOT work.
For having the same sound as with the original Soundboard use film capacitors instead of kerkos for C1 ... C6 (C4,C5,C6 are optional).