I am repairing a vintage Seeburg/Gulbransen 'Select-a-Rhythm' drum machine from 1967, the kind you would sit on top of your organ and play along with.
I am trying to distinguish what this component could be, it basically looks like an old capacitor but it has 7 legs. I've attached a photo below to identify it (highlighted in yellow circle):
The item states SPRAGUE 663044-4, it has 7 feet and there are 6 of them. could these be the pulse generators(for the rhythms) or some kind of logic circuit? The schematic diagram states them as PC001, PC002, etc. The circuit diagram is attached below also. Could PC stand for Pulse Circuit?
Also, if anyone can identify the mysterious transistors which all say '4000' on them and nothing else. the schematic states them as 'q2001, q2002, etc)
The machine didn't turn on when I first bought it and now I have it lighting up, I've attached a foot switch to start/stop the rhythms which is working perfectly with the tempo light, but still no sound!
I've re-capped all the old paper and film capacitors so I'm hoping it could be a few resistors somewhere because these mysterious 7 legged creatures look like they could be difficult to find replacements.
Thank you for your help, I'd love to hear this thing working once again! This is just a hobby for me so I'm in no rush, looking forward to your reply.