A-610 Tech Sheet
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General Description The Telex Models A-610-1 and A-610-2 are economical, lightweight aviation headphones featuring magnetic receivers. The A-610-1 has vinyl ear cushions, and the A-610-2 has molded plastic earcups. The Model MRB-600 is a lightweight headset that features magnetic receivers, vinyl ear cushions and a boom-mounted, noise-canceling carbon microphone. A-610-1 and A-610-2 are approved under FAA - TSO C57. Design Features The receiver housings are constructed of high-impact plastic. The headband consists of two spring-steel wires sheathed in vinyl. The headband wires extend down through slots in each receiver housing and provide a minimum of 2-1/2 inches (63.5 mm) vertical adjustment. The headband wires terminate in plastic dress caps to prevent disengagement of the receivers housings. The receiver housings are capable of limited rotation to fit the head contour. The MRB-600 microphone boom is a square aluminum extrusion. It adjusts back and forth at least four inches (101.6 mm), and rotates 310 degrees to permit the microphone to be used on either the left or right side. The microphone is contained in a high impact plastic housing with front and back plastic mesh grills to prevent foreign particles from reaching the diaphragm. For best noise cancellation the microphone should be positioned as close to the mouth as possible. A position at one side of the mouth is best to minimize popping, hissing and breathing sounds when speaking. Specifications Receivers: Type: Magnetic Impedance: 600 ohms (matches 150 to 600 ohm radio output) Freq. Response: 100 - 5,000 Hz Sensitivity1: 100 dB Microphone (MRB-600 Only): Type: Noise-canceling carbon Matching Impedance: 50 - 150 ohms Freq. Response: 200 - 4,500 Hz Sensitivity2: -48 dB Operating Voltage: 8 - 30 VDC Unit Plugs: A-610-1 & A-610-2: Molded, PJ-055 equivalent MRB-600: Molded, PJ-055 equivalent for headphones; Molded, PJ-068 equivalent for microphone Cord: 5.5 ft (1.7 m) straight Gross Weight: A-610-1: 8 oz. (227 g) A-610-2: 7 oz. (196 g) MRB-600: 12 oz. (340 g) Color: Black 1 Ref: 0.0002 Dynes/cm2, 1 mW input @ 1 kHz 2 Ref: 1V/mbar at 1 kHz, 12 VDC supply, 100-ohm load

Schematic Diagram *For use with the MRB-600 when the aircraft does not have a built-in PTT switch. Check out our website - www.telex.com/aircraft for a dealer near you or call toll free 1-877-863-4168