How come this transistor conducts when the input doesn't reach 0.6 V and the emitter is at the ground?
The green signal is the collector ouput . the blue is the input.

 

It isn't

 

What makes you think the transistor is conducting? The voltage after R1 depends on the current flowing into the oscillator, not the transistor.

Take a look at the current across the transistor.

 

I can't read your circuit......too small and I can not expand it.

Now.......does the collector signal come from the transistor junction...............or from the bias resistor?

 

Boy....they sure have slowed down on letting you know someone has posted............while you are posting.

8 minutes passed, without informing me.

 

Thanks for your replies , .you're right, i checked the transistor isn't conducting.

 

8 minutes passed, without informing me.

I've been embarrassed by this a couple times lately. Not enough to suspect something has changed.