[5] In the early 1930s, the BBC became aware of RCA's model 44 ribbon microphone that was used in Hollywood.

There were initial concerns that the new design infringed the patent of the RCA microphone, but these were overcome.

[6][7] The original Type A microphone was designed by engineer F. W. Alexander[8] under the guidance of H. L. Kirke's Research Department at the BBC.

[4] In 1953, production began on the PGS (pressure gradient single) ribbon microphone in agreement with the company Standard Telephones and Cables (STC).

[12] In 1944, the microphone was renamed the AXBT with the addition of a Ticonal magnet to increase sensitivity by 6 decibels.