A vintage receiver from WWII. It is in good, vintage condition with some fraying on the wire-covering and rust. Is approx 34" long. Made By Wm J Murdock Co. The original and most commonly used radio receiver headset for the tank helmet was the HS-18. This headset did not use a headband, as it was designed specifically for use in tank and aircraft helmets. When used in non-helmeted applications such as in aircraft, a headband HB-7 was used and the headset was called the HS-23. The HS-18 that was originally used with tank helmets was a very simple brown waxed cotton-covered braided cable. Both ends were connected to a high impedance (2000 ohm) R-14 receiver. The length of the cable from the receiver to receiver for tank applications was approximately 13 inches, which made for a relatively taut wrap around the M-1938 helmet. (other HS-18 headsets used a slightly shorter 12-inch length). One end of the harness contained a "Y" with one side of the "Y" connected to an R-14 receiver, and the other end connected to a black-shelled PL-54 ¼-inch plug. The "Y" end could be mounted on either the left side or right side of the M-1938 tank helmet to suit the individual crew member's preference. This PL-54 plug on the HS-18 headset was then connected to a JK-26 jack on one end of a 6-foot long CD-307 cable. The other end of this CD-307 cable connected to the tank's BC-606 intercom control box via a ¼-inch PL-55 plug. The HS-18 headset cable had a built-in strain relief cord, as shown in the photo below. This cord was tied to the strain relief lug on each R-14 receiver with virtually no slack. Because the headset wires had more slack than the tied relief cord, if the cable was pulled, any pressure would be absorbed by the strain relief cord. This prevented the headset wires from being disconnected during operations.