The G7 is a tube condenser microphone based on the Neumann U67 and U47.  The designer describes the circuit as a combination of the M49 and U47, but with the tube from the U67.  Instructions, a bill of materials, and a PCB layout are available on the Gyraf website.

Images courtesy of Gyraf Audio

Notable Features:

• Switchable between omni, cardiod, and figure-eight pickup patterns
• Designed for AKG C12 capsule, with other options available
• EF86 tube
• Lundahl transformer

Price: No products available

For more information visit www.gyraf.dk.