The PCB: http://www.vintagemicrophonepcbkit.com/DU87.html. The pcb version I chose is the D-87M. This is the latest version of the PCB at the time of this writing and fits the SYT5 body. There is a bill of materials (BOM) listed at the top of this site that should be current as well.

Vintage Microphone Project DIY Classic Tube and FET Microphone PCB, Printed Circuit Board, Electronic Fun

The Vintage Authentic C12 microphone circuit for DIY , a side-address, large-diaphragm design based on the famous AKG CK12 capsule, equiped with 6072 dual-triode, as well as a transformer-coupled output circuit.

This Kit include support PCB for AMI T67 Transformer or AMI BV12 Classic Series using the BV12 Classic Serie Adaptor available from the order page as an option. the Kit includes a Complete Mic PCB specially designed for the IOaudio Custom BV12 transformer.

Vintage U87i Circuit Recreation Microphone . Switching PCB for Pattern , Pad and Low Cut functions. D7 Capsule Mount. 58mm Classic & 50mm Short Version

one of the center holes. Attach switch PCB With the 3 screws and standoffs. Install main mic PCBs into mic body on the Same side of the rail that has been modified to fit AM I T67 transformer.

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Other Transformer configuration yes i got it this morning , cant wait to start a new build with this traffo. i really like my D-EF47 with the BV8 classic series. let get this bv12 classic series going :) the 2 black wire are actually shiedling of the core, take those 2 wires to a gnd pad onm the pcb, Also note that the Blue wire (4) is the +audio out and the White (3) is - audio out