





This mic pair is based on the ELAM251 circuit, but instead of the edge-terminated C12 style capsule, these use center-terminated U47 style capsules.

The circuit is built with turrets on Plexi glass boards. The sensitivity of the capsule leads can be either floated or built on a high impedance board, like Plexi glass.

Because these mics use a cap bypassed cathode resistor and the heater current is not used in the audio side of the circuit (like it is in the U47), the required power supply is simpler.

A 10:1 Beyerdynamic transformer is used in reverse from the tube plate, blocked with a 1uF film capacitor.