LD Systems D1120 microphone

LevinGuitar · Sep 25, 2021

Good looking body and good headbasket for using a M7/K47 capsule right?
Inside there's an Apex 460 circuit with different cap values (4x 4.7uf), 12AT7/12AX7 tube and a big "K67" capsule.

Just sharing body for mod ideas.

Khron · Sep 25, 2021

Heeey, no fair! I caught one of these a couple months ago ridiculously cheap, but i hadn't gotten around to looking too deeply into it. It was sold as faulty - one of the capsule wires had broken off the solder joint.

LevinGuitar · Sep 25, 2021

What circuit do you have in mind? I would like to try AMI UM92 + EF86

Khron · Sep 25, 2021

Nothing specific in mind, but given the body style, it would lend itself to a U47-ish type deal. Obviously not with a historically-accurate circuit (which I'm skeptical about to begin with), but some sort of single-triode or pentode circuit should do.

I'm definitely not willing to shell out too much of an investment into this though, and i still have an unused chinese K47-type capsule from Banzai's group buy a couple years back. I'm gonna want to raise the capsule mount though, maybe on top of some threaded spacers, or just longer screws and a bunch of washers. Details still pending...

LevinGuitar · Sep 25, 2021

I tried to save as much as possible original components and placement, is there any mistake?

Original AMI circuit:
https://www.tab-funkenwerk.org/arti...schematic-archive/um92-and-um92-1-schematics/
(Edit: schematic updated)

doqmemory · Sep 25, 2021

LevinGuitar said:
I tried to save as much as possible original components and placement, is there any mistake?

Original AMI circuit:
https://www.tab-funkenwerk.org/arti...schematic-archive/um92-and-um92-1-schematics/

R1 is 1G .5W on the AMI schematic. What transformer are you using?