Cobham’s Aircraft Audio Mixing Amplifier Model 247 is designed for use as a multi-purpose mixing amplifier.

Cobham's Aircraft Audio Mixing Amplifier Model 247 is lightweight, compact, and versatile.  It operates as a mixing amp for aural warning, cockpit voice recorder, or virtually any other aircraft audio signals.  Each input is adjustable to accept 0.25 Vrms microphone signals, headphone audio signals from a standard aircraft audio system, or receiver input signals up to 50 mW. Mic bias for each input channel us user-selectable and access for gain adjustment and mic bias selection is made by simple cover removal.  The model 247 can also drive headsets for headset amplifier applications.


  1. Weight: 0.35 lb. / .16 kg
  2. Power: 0.3 A max / 28 Vdc
  3. Dimensions: 1.98"W x 1.43"H x 2.5"L (50.29mm x 36.32mm x 63.5mm)
  4. Compliance: TSO-C50c, DO160C
Do PostBack