Offered for sale is a working microphone circuit board fitted with an original Telefunken AC701K tube.

The circuit board has been tested and works.

The tube has a known issue: one of the grid leads was damaged and has been repaired by soldering. The tube is installed on the board and is operational.

Included:

• microphone circuit board;
• original Telefunken AC701K tube.

A good option for a vintage microphone restoration or tube microphone project, especially for collectors and builders looking for an original AC701K.