BV11 Transformer

Description

Advanced Audio BV11 Transformer

Replacement dual bobbin BV11 type transformer:
For Apex 460, Nady TCM1150 and other Chinese
tube microphones.

Used in Advanced Audio Microphone CM12:

The CM12 utilizes a BV11 dual-bobbin transformer output modeled on those found in Neumann’s M49 and M50 microphones. Wound to the original specs, the smaller-turns-ratio BV11 is easily driven by the optimized low-impedance 6027a circuit, yielding 6db more output level than the original transformers used in the AKG C12 and ELAM 251.  This allows the head amp gain to be further reduced, increasing the total headroom (output level before distortion) by 6dbB.

The BV11 transformer is driven through a 2.2-ufd mylar capacitor to take advantage of the ability of both capsule and transformer to respond to frequencies reaching down to 10Hz.  The transformer can deliver +18dBm with less than 1% distortion across the audio spectrum