Yusynth VCO troubleshoot

[Snaper]

Hi there guys,

I've adopted this amazing circuit to 4U, built it, yet, I have troubles...
It does not seems to work.

I've found a minor error on the board, it is fixed now - yet, it still does not work properly and I'm 100% sure I just made some minor mistake somewhere.

ICs getting the proper voltage, all component orientation and value is correct.

Note - this is a custom board, not the original one - hence, t might be some drawing errors :S

What I have at the Saw output, is actually a sine-like waveform, but it oscillates at 8kHz.
Trimmers or freq/fine pots des not have any effect.
Any tips?

[Snaper]

Investigated further, I've found a minor "overlapping" error on the PCB...
trace cut, jumper wire, now all good.
Yet, the VCO still does not work.

It oscillates around 840 kHz, and I have a new "symptom", the LM311 gets pretty hot :S

[Snaper]

Ok, this is a "tuff" one - still no luck.
I've made some measurements without the LM311, everything on the IC pins looks OK.

[Snaper]

Weird, but for some yet unknown reason, I have 9,3 Volts at Pin7 on the LM311 - for sure, that is not really good!

[Snaper]

Update, I've removed all the ICs and the J112, yet, the 9.5 volts is still there at pin7 of the LM311 and I don't know where it comes from...

[Snaper]

...
anyone, from the future, who reads this:

NEVER EVEr BELIEVE YOUR STORES SUPPLIED DATASHEET!!!

...
the issue was the store, where I bought the J112 had a datasheet with DGS pinout, but, the actual part I've got has a DSG pinout.

[blue hell]