Looking at the circuit diagram in the article Part 1 revealed that A6, A8 and A9 match up with the LM318H which fulfils the author's notes that say they have to be high speed/wide bandwidth devices, and the LM318 has positive null balance pins connected to the collectors of the I/P stage, so that's three solved!
A2 and A3 appear to match up to ordinary '741s, the transistor array can probably be replaced with a CA3086 with a suitable PCB layout to connect pins 1, 2, 3, 4 and 5 as the differential pair instead of 10, 11, 12, 13 and 14, and the diagram incorrectly marks A10 (К140УД1Б) as "A9", so we just need to find a match for A10 if there is one, but a μA702 does NOT match!
Chris Williams