This headset has very good noise isolation. When wearing these you can not hear any normal sound level exterior noises.
These are headphones, they have no microphone provision.
The ear pieces are shaped so that a helmet can be worn over the headset.
On one side the ear pieces are marked "Astrocom" and on the opposite side 10391B which is the p/n for the ear cushion only.
The 2 foot long when retracted cord has a label:NSN 5965-01-182-3384
DC resistance A to B is 500 Ohms.
SB 11-628.pdf - for use with radar set PPS-5
Astrocom Electronics - Model 10956A (H-251A/U) - A Tri-Service type, wired in parallel, incorporating plastic ear cup with noise attenuating characteristics for use in medium ambient noise area. All components designed with maximum strength for hard usage without damage. Unit replaces H-251/U and H-140B/U. Constructed to meet all military environment requirements IAW MIL-H-83511/1. - Wiring Diagram & Drawing -
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