Blue Jinn,
I'm just doing an old-fashioned DIY conversion to C12 circuit with the PCB from the mic. I've been following the Chunger/Matador C12 thread, and it looks great, but I'm goin' ol' skool for the moment, tho planning on ordering a head-basket or two.
Using a Cinemag CM-2480, one of the group-buy RK-12 capsules and parts from local suppliers. Found a nice 6072 locally also.
Also have a Nady 1050 that still has the CCDA in it, a good 12AT7, and improved caps. Trying for more of a 47 vibe from that so I put the stock HST-11 capsule in that, replacing the RK-12 I had in there, which sounded pretty good. The new 67-style capsule from the HST-11 sounds better than the original 1050 one did, but still honky. Guess the QC has improved over the years, but I will eventually put something a little better in there, and hope Dale keeps making the M7s until I can afford one.
Will hopefully upgrade the HST in the future to a higher quality capsule, but will go with what I have for now.
Will also upgrade my Big Ugly/G7 with an RK-12 (currently has the old 1050 capsule in it) and Cinemag, but have a long weekend of work ahead before I get time for that.
Then I need to do a LOT of recording with these so I can really get a feeling for them.