hybrid microphone component compatibility question

Building a "hybrid" microphone on the C12 circuit and wondering if the Cinemag CM-13101 is suitable for use on a 12AT7 plate follower tube mic.

It seems the winding ratio is in range given the 12AT7 has a bit higher gain than 6072A, and I would like to try a large core transformer and the 13101 is what i have on hand.

For main components, I am thinking along the lines of:

- Eric Heiserman HK47 capsule
- Mullard 12AT7 tube
- 2K output capacitor
- Cinemag CM13101

I like the shape and 9 pattern flexibility of the C12. . . the circuit also seems to be a straight-forward "flat-response" type circuit.  Our studio tends to favor the more mid-forward center terminated Neumann style sound for general use, so I thought I'd build a hybrid mic and see how it runs.  Since this is DIY and all.

Don't know if any of the info here will offer you anything you don't already know. But I happened to stumble into these pages today and they seem to address some of the criteria you are considering.

http://www.foxaudioresearch.ca/transformers1.htm

http://www.foxaudioresearch.ca/transformers_more.htm

Seems like cm 13101 is out.  It will not easily fit without lengthening the microphone tube by about 1 inch. . . Which i should do on a future mic revision, but it will take a longer than the test period that i have.  I should stick to small core CM-13114 or CM-13113 to start.

The Samar 12:1 Big core tranny just squeezes into an Apez 460 type body and should be fine with a 12at7!
sound samples below

http://groupdiy.com/index.php?topic=58091.0

Not sure how relevant, but I recently asked Cat5 to swap out the Chinese C12-type in one of your MataChung C12 builds (setup for the Mullard 12AT7 as detailed in your build instructions) with a microphone-parts.com RK-47 capsule, figuring the K47-type capsule might work well with the 12AT7 configuration (Cinemag 13114)...well the results were not favorable in this particular case...what was a very smooth voicing with the C12-style capsule was now a more "bitey" mid-forward, somewhat edgy top-end response...

Now, of course, the RK-47 is not Eric's HK47 (which I have in my MK-47), so your results may vary...needless to say I asked Cat5 to be so kind as to swap back out with a better version of the Chinese C12-type capsule I had not yet implemented...

I was able to put the HK47  hybrid microphone together with the Cinemag CM-13114. . . upon initial checking, the mic sounded pretty neutral and open to me with the 2uf cap upon initial sound-check.  Dropped it off at the studio and will get more feedback from them.

This prototype is also serving as a verification build for Matador's new ceramic composite boards with resistance properties near PTFE.  I'll see where this iteration lands sonically and then tweak if necessary.