Yeah, I perused the manual, looks like a great example of '60s state-of-the-art high technology: discrete amplifiers everywhere, 100% silicon, hardly an IC in sight (and those mostly just where needed: now-obscure parts like matched diode arrays and the like).
My Wavetek 193 is of similar development, but to implement the pulse logic and frequency response (20MHz), they used a mess of 10k series ECL! Lots of op-amps, but still no shortage of discretes.
Tim