So, after new ICs (339, 4013, 471) and new eletrolytic, the mistress sounds great !!!
My only concern is in non sweep mode, i get a bad oscillation sound when range goes to about 80% and no effect at all after 80%. From 0% to 80% it sounds ok…
In sweep mode, all range pot range is good.

I performed the alignement procedure.

Is it normal ?

small progress here…
i changed the LM471 and now i have a V+ !!!

But still no or bad sound
so i began the troubleshooting procedure : http://www.metzgerralf.de/elekt/stomp/mistress/repair.shtml

Turn on power supply and check for 18.0 V at pin 7 LM741
-> ok

Check for 12 V (12.0 – 13.5 V) at pin 8 4885, pin 14 4013, pin 3 LM339
-> ok

Check for a low frequency (~0.05 – 20 Hz) sweep about 0.5 to 9 V at pin 2 LM339 – frequency controllable by RATE pot
-> it’s stange here : i have about 9V and once every 10sec it drops to about 3v for a glimpse and then goes back to 9V. is it what is expected ??

Check with oscilloscope for clock output at pin 1 of LM339 (~40 kHz to 400 kHz)
-> i do have something that looks like a clock (9V that goes to 0v at a Khz frequency)

Switch to FILTER MATIX mode. Clock frequency must be controlled by RANGE
Check with oscilloscope for square wave output at pins 9, 12 and 13 of 4013 (~20 kHz to 200 kHz)

-> it’s totaly flat at thoose pins

strange things on my unit : pin 4 of the 4013 goes straight to pin 2 of the LM339 ?

I had 2 red tantalums between 2 and 4 of the LM339, one 1uF, the other no reading ? changed for what i had on hand (parralel 2.2uF and 50n)

the 33uF is here, it was on the other side of the pcb
there’s no zener, but a transistor instead : 2N3563
here’s a picture :

https://ibb.co/xh2pVDD

about 741 voltages :

pin 1 : fluctuating 1 to 2 v
pin 2 : 6,84V
pin 3 : 0,439V
pin 4 : 0V
pin 5 : fluctuating 0.7V / 1.5V
pin 6 : 13.6V
pin 7 : 14.7V
pin 8 : 0V