This mic build is based on ideas from the legendary Neumann U47, but differs significantly. It retains the tube bias method that avoids a cathode bypass cap and routes the heater current through the cathode resistor to stiffen the response. The tube body is true DIY - made from brass railing parts and plumbing solder.
Built using turret boards, with a EF800 Telefunken tube, an AMI T47 transformer, and a Thiersch PVC cente terminated capsule. The power supply housing is from collective cases, and the power supply design is from danny (at groupdiy), which uses a choke and heavy filtering to prepare the H+. The lower turret boards are F4, while the high impedance connections are connected directly to the tube or teflon isolated turrets.