Ok, I got all ICs for the VCO, and a bunch of transistors for testing the replacement parts. This is the circuit I'm trying to build, from the application note in my first post:

I downloaded all datasheets for the packages and copied it to an image, for easier reference (always a good idea when building it on a breadboard)

Sorry for some noob questions, but how do I connect the LM311? I guess the "EMIT OUT" pin has to be connected to -15V, and "COL OUT" is the op-amp output pin in the circuit? And Vcc+ is connected to +15V, and Vcc- to -15V. But what do I do with BAL/STRB and BALANCE?
And for the LF351 / LF356 op-amps, do I need to connect the offset null potentiometers, or can I leave it unconnected?