#2700 twin t drums

Ok so the 4011UBE 's turned up that @fredrik asked to test.

yes they do work however they do have more decay. If you drop the 4011UBE into the circuit as it is, the decay knob on max would cause the drums to oscillate, so in order for it to still be controllable to your liking with the preset potentiometers may I suggest to swap

R2 150k
R17 150k
R32 150k
R47 150k

with a higher resistance, I think the best bet is 470k which will give the preset potentiometer plenty of travel for you to adjust the decay knob to your liking.

I will make sure to drop these resistors in to double check for myself later on today.

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