rje71 Posted November 26, 2017 Share #1 Posted November 26, 2017 Maybe a strange question but anyone know by chance when H-157a/aic headset started to use the wire boom for the mic that had the pivot/swivel in it as apposed to the straight one ? Robert Link to comment Share on other sites More sharing options...
mohawkALSE Posted November 26, 2017 Share #2 Posted November 26, 2017 Id say early 70s. I'm not 100% on that for the USAF headsets but for the SPH-4 helmet 1971 was the first contract for them to do away with the screw joint vs the newer round ball joint. That lower shorter boom you showed is generally for a size Regular SPH-4 or a Medium HGU-55/P. The longer ones were for XL SPH or Large and XL HGUs. I think the headsets usually used the silver color ones as well. The H-157, and HGU-7 that I have had the silver booms as well as being the long boom for headsets. Link to comment Share on other sites More sharing options...
rje71 Posted November 26, 2017 Author Share #3 Posted November 26, 2017 MohawkAlse, thanks for the reply and for the info ! So I am guessing that a new issue USAF H-157 headset in the 72/73 time frame may have included the new pivot/ball joint type boom . ( The silver one of course those were the best picks I would find the black ones ) . Robert PS: one other question for anyone, is it possible to determine the production date of a H-157 ? I have one with a MFG date on it 82872. But I seem to see others with this same date ? Link to comment Share on other sites More sharing options...
mohawkALSE Posted November 27, 2017 Share #4 Posted November 27, 2017 That number your posting I believe is the MFG number, like what a CAGE code would be today. I looked it up in a CAGE search and it sure came back as Roanwell Corp and still active. Ive def seen that number on my H-157 headband and the ear cup seals etc. The H-157 I have I cant recall if there was a contract number on it but it sure had the silver ball socket type boom. Link to comment Share on other sites More sharing options...
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