Schoeps C5 schematics: your advise needed

hello

Reading the C5 Schoeps' schematics several times (i put it in attachment), I noticed that the value of the impedances (I suppose: inductors):
DR 1, DR 2 are not specified.

Please correct me if i wrong: these impedances are part of the stage managed by T4.
If I understood correctly, it is an oscillator.
D1, D2, C7, C8 are a duplicator cell.
Thus, I think that the oscillator generates an alternate tension, which is doubled by the duplicator cell, then applied to the capsule.
DR 1 and DR 2 are part of the oscillator.
Is it right?

At this point, if for some reason the values of the impedances is not known, it's not possible to replicate the exact circuitry, but applying the same principle, it's possible to have the same result.
Thus: Oscillator plus Duplicator cell.

At this point the question is: what is the suitable frequency value of the oscillator?
And: is my deduction totally wrong about this stage?

Thank you in advance for any your help

Dr 1 = 150 uH
Dr 2 =  68 uH
Frequency ~ 2 MHz.
You can adjust the output voltage by varying P2 or changing the 6.8 pF capacitor.

RuudNL said:

Dr 1 = 150 uH
Dr 2 =  68 uH
Frequency ~ 2 MHz.
You can adjust the output voltage by varying P2 or changing the 6.8 pF capacitor.

Click to expand...

Oh great! TYhank you very much Ruud