• Noise Cancellation

    The 66T microphone provides excellent noise cancellation and speech intelligibility in moderate noise environments. The microphone discriminates against all sounds more than 1/2-inch away.
  • Microphone

    The microphone is gain adjustable through an opening in the back of the microphone using a small, flat-blade screwdriver. The microphone is supplied with an adhesive label which may be placed over this opening after adjustment to prevent tampering.
  • Versions Available

    The model 66TRA is also available which features a molded right-angle plug. All other aspects of the microphone are the same as the 66T.
  • FAA TSO Approval

    The 66T and 66TRA microphones are approved for aviation use under FAA TSO C58.

The Telex Model TEL-66T is a noise-cancelling aircraft communication microphone. It consists of a dynamic microphone cartridge, transistor amplifier, and push-to-talk switch in a rugged, black plastic case. A hangar bracket and mounting hardware are provided with the microphone. The Model TEL-66T has a straight PJ-068 plug. The Model TEL-66TRA is identical to the TEL-66T, except that it has a molded right-angle plug. Both models are approved for aircraft use under Federal Aviation Agency TSO C58.


Microphone Sensitivity -48 dB (re: 1 V / μbar @ 1 kHz, 12 VDC)
FAA TSO Approvals C-58
Retracted ~12 in (30 cm)

Extended ~5 ft. (1.5 m)
Weight ~9 oz (255 g)
Microphone Type Close Talking Differential, Dynamic Element
Mounting Blade Mount
Frequency Response 100 Hz – 5 kHz
Connector Type PJ-068 equivalent or Right angle PJ-068 equivalent
Warranty 3 years


Name Size Date
66T EC Declaration of Conformity 100KB Nov 6, 2014
66T FAA TSO Approval 52KB Nov 6, 2014
Name Language Size Date
66T Technical Data Sheet EN 204KB Nov 6, 2014

66T Full

66T Back

Name Size Date
Headset Cleaning Memo 84KB Jun 12, 2020
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