val Posted April 2, 2019 Share Posted April 2, 2019 Does anyone know when exactly those "three screw" Dfh.a / 24b-610 headphones were phased out and those new "four screw" Dfh.a we all know were introduced? https://www.radiomuseum.org/r/mil_doppelfernhoerer_dfha24b_610.html Gerätliste D97/1+ from 1.7.1943 states that 24b-610 is Doppelfernhörer Dfh.a, so code and designation remained the same, only design was changed. Link to comment Share on other sites More sharing options...
Funksammler Posted April 2, 2019 Share Posted April 2, 2019 I think this is just a design variation, slightly different from the prewar Telefunken/Siemens etc. design. Around 1937 a lot of new equipment was phased in, the Torn.E.b, Torn.Fu.b1, d2 etc. so the equipment standards crystallised around that time. They must have thought the extra magnetic circuit added some power to the headset, but it seems it was dropped shortly afterwards as an unnecessary manufacturing complication. regards, Funksammler Link to comment Share on other sites More sharing options...
val Posted April 2, 2019 Author Share Posted April 2, 2019 Thanks @Funksammler. So far i have seen "three screw" versions from 1937 and 1938. Does anyone have later ones to show? Link to comment Share on other sites More sharing options...
val Posted April 2, 2019 Author Share Posted April 2, 2019 Nice detailed images of '37 https://myvimu.com/exhibit/87395-sluchawki-polowe-1937 Link to comment Share on other sites More sharing options...
val Posted April 2, 2019 Author Share Posted April 2, 2019 @Funksammler - earliest "four screw" headphones i have seen is dated 1940. This makes 1939 very strange year - haven't seen neither "three" or "four" screw variant of that year yet. Hopefully something will come out... Link to comment Share on other sites More sharing options...
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