T106-2 core vs.??? core Amplifier problem

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OK...

Amplifier is fixed...I used Eva's advice and inserted 100uF capacitor in series with 1K that goes from pin 2 to GND (LM311) + I added variable resistor (5K) to offset adj. pins on LM311 (with this I was able to do precise adjustment).So far so good...I am attaching updated schematic here:

Thanks,Eva

I used an XOR gate as a phase splitter to keep the gate delays the same.
 
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