0:35 sounds like a late-gen Faraday EM horn, LOL. 0:12 is like that, too reminds me of '9833s and a lot of Simplex videos that I see of '9219s and others of the same period, most likely. Maybe like '9817s? Epic Faraday-like braps! Reminds me of this one, which has a well-filtered Simplex 4004 FACP: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-dtYo287OEJ8.html