I have a question about these micro tube mic ?

[pasarski]

So I leave it closed there I would like to test the circuit unfortunately the tube is no longer available for purchase 6088 I think it will work Is this circuit even intended for capacitor capsules? the idea is not bad

No, it's a DI-box. But you could study it for inspiration. You need higher input impendance and also a polarization voltage for the capsule.

 

[mic test]