I'm restoring one of these also, and my sound card doesn't seem to work. it looks like it's got one missing diode. if anyone finds a better picture of a complete sound board so I can figure out what's missing, let me know. the picture above looks slightly different than mine. also, looking for some info on the magnet under the field for the different pitches. mine is missing altogether.
thanks!
Blake
blake_131 (at) hotmail.com