OK had a stab at re-creating the schematic. It's screwed together from essentially 3 bits:
 The full-wave doubler giving some 136V DC .and 68V DC
 A string of zeners to set the o/p voltage of the pass transistor.
 A 10mA current limiter, 0-20mA meter and a switch to discharge the cap.
In accordance with my lifelong habit of not getting anything error free, the transistors are MJE
13005, not MJ
The 2 resistors with *** may need small changes as the load regulation of the transformer may give a higher o/p voltage.
If anyone builds it,
 Do the doubler first and check the volts are fairly near, although they won't be precisely the same.
 Make the Zener circuit, then set VR1 for 20V on the 16V range. [ you'll see why in a bit ]. Measure from Q1 emitter to 0V. Check the other voltages, make sure you ain't got a cranky Zener. They should all read about 4V high.
 Make the rest. Put a short circuit instead of the cap. and set VR2 to give 10mA on the meter.
 With a 10R resistor instead of cap. tweak VR1 again to read 16V from the -ve to +ve test terminals on the 16V range. Then check the other ranges.
The -ve test terminal actually sits at some +4V because of the Q2 limiter action, hence the 4 extra volts in .
Poke a GOOD
biggish cap. in and set up. [ Not in that order ]
The meter should whip up to 10mA and stay there. When the cap's charged up it will swiftly drop to zero.
As this contraption is sort-of linear you can make a fair stab at finding out what a cap. really is.
CV = It ...
Capacitance x Volts = Amps. x Seconds
C = ( I x t ) / V
Suppose we have 25V, Amps. = 0.01, time to when the needle starts to drop, 6 seconds.
We have (6 x 0.01) / 25 = about 2400uF.
Have done this with caps. marked 56,000 uF, 25V and then with my Peak capacitance meter and it's pretty accurate.
EDIT S1 is a 1P 12W rotary switch, stopped off @ posn. 8 ..
S2 on mine is a ON [ON] 2P 2W just flick it to discharge the cap.
DVM should drop to 0V, then cycle cap. again if it's not been used for a long time. The 'slow' drop from 10ma to 0 gets sharper as cap. improves.