Sorry late reply.. Yes I seeTry to analyze this circuit:
View attachment 199432
Do you see how R2 adds positive feedback?
The question you asked, my understanding is that there is positive feedback because Vx and Vout will have the same phaseCan you elaborate a bit more, because I don't understand what you are trying to tell me?
Yes, it works without RfZeeus...If you like, you can remove Rf .......and the circuit will oscillate !
The only purpose of the RF path is to allow a safe start of oscillation.
However, this is - sometimes (!!) - only necessary during simulation when there is no other "kick-off" puls for starting the oscillation.
In real life (hardware) such a kick-off is created always by the switch-on transient of the power supplies.
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