Hi fellas,
thanks again for your compliments, ideas, questions, discussion etc.

I'm sorry I don't respond very much, but I'm still kinda busy..
Anyway, I have some news (both good and no so good)..
I've got finally my hands on the real
vintage Electric Mistress with SAD1024 chip! It's a Deluxe not the Standard version, but since 9V EM is SEM/DEM hybrid actually ("standard" audio path, rest is deluxe, more or less), it is pretty useful too.


It was an "eyeopener" for me in many ways and it made me start a new round of EM3207 R&D (actually I did plan to do some tweaking of rev1.1 yet anyway, but comparison with the real piece moved it to another level).
Biggest difference is definitely
sweep range (and
sweep character). EM3207 1.1's maximal range hardly touched DEM's minimal.
I did measure control voltage range at
clock VCO and it's V-f characteristic:

- Blue values/line represent measured clock frequency,
- Red values/line represent calculated BBD delay time (=512/(2*fCLOCK) here)
- 1.69 to 9.24V is Filter-Matrix mode range
- 1.26 to 10.31V is maximal sweep range (triangles).
- (VCC = 15V, RCLOCK = 18.43k)
So the delay time range goes from
8.83 to 0.20ms which makes max/min ratio
44:1!!

And btw., since V
CTRL sweep are linear triangles, frequency sweep is
HYPER-TRIANGULAR! Oh yeah - that's why we love EM so much, I just did not see it that clearly up to now

I've made two samples with maximal range, lowest rate and no feedback (color):
DEM15_noise.wav DEM15_shine.wav EM3207 v1.1's maximal ranges were pathetic compared to this (e.g.
271~1245kHz at one particular setting), max/min ratio was cca
5:1~7:1 depending on C17 and clock trim setting, and maximal frequency I was able to get out of it was cca
1250kHz (above this limit 4013 failed to read 311's output and 4013's outputs were frozen) which equals only to 625kHz of DEM (
0.41ms, we have BBD twice longer!), plus sweep did not sound that pleasant when clock were adjusted to this range, like if it would slow down at the top (now I know that sweep curve was loosing it's hypertriangularity).
So heavy R&D started again

Since then I am tweaking my EM3207 prototype:

emulating VCO in LTSpice:

and I have even built the standalone replica of the clock to be able to study more comfortably and safely influence of all possible factors including e.g. V
CC (you know, EM3207 cannot be fed by more then 10V and I've wanted to see what's going on with VCC = 12 or 15V):

All of this to get the EM3207 clock working as close to DEM with doubled frequency as possible

I did break original 311 to 4013 transition top limit relatively easily (actual "record" for f
CLOCK is
2.1MHz, eventually
2.7MHz), but just to find that lowering value of the clock capacitor is not the way, that other parts have it's limits too (including LM311N, those
2.7MHz I did achieve with old Tesla MAB311 equivalent) etc., it is really long story and it's not over.
Here's the best what I've achieved so far (Tesla MAB311 used, same setting as for DEM15):
EM3207_noise.wav EM3207_shine.wav
Just to calm down all those who already started to build original EM3207 v1.1 - all those tweaks should be posible using v1.1 PCB, it should be (so far it is) just about different values of some components mostly. And actually, even original EM3207 v1.1 sound pretty good 
Cheers, T.
Note: pics are clickable for hi-res.