I just pulled this out of storage after twenty years to listen to some old albums, but I'm missing the headshell (I found my old Shure cartridge, but the headshell isn't with it). After much searching, I found one site that has a headshell/stylus combo advertised as an "ADC" type unit for an Onkyo table (I believe ADC stands for Audio Dynamics Corp, but I could be wrong).
Anyway, the tonearm has a seven connector layout in three horizontal rows:
two male, three female, then two male. The headshell would be the reverse of that. Is this what they call the "ADC" layout.
Any help appreciated.