Low noise low ripple CC/CV power supply - modern replacement for ua723cn based regulator
Just about any contemporary NPN and PNP power transistors that are rated for the voltage and current will work as the output devices in this circuit.
It's a pretty good circuit if you have the manual to explain all of the adjustments.  Rather than use the 723's internal current limit circuit that is based on the Vbe voltage drop of a transistor (and not very accurate), this schematic has R137, V102, and V103 as a much more accurate current limit circuit based on the 723's internal voltage reference and a true differential comparator.
The 723 was copied by many other companies.  The LM723 from National Semiconductor (now a part of Texas Instruments) still is available.  I'm sure European and Japanese companies still produce the part with different prefixes.