Re: F-connectors and Phono AKA RCA
Both are American, Late 1940s early 1950 (F) and late 1930s (RCA coax).
Old UK TV connectors are "Belling Lee" (actually the original maker and not a real part name), of indeterminate RF impedance and designed for AM radio aerials in 1930s! The USA I think has used F-connectors for a long time for coax when not using 300 Ohm Ribbon.
A Phonograph uses cylinders and Gramophone uses disks. But USAians call a Gramophone a Phonograph, even though Gramophone was first called that in USA (Emile Berliner, Victor Talking Machine Co, who founded Japan's JVC and UK's HMV, Victor was taken over by RCA to become RCA Victor. This is why RCA, JVC (only in Japan as Victor) and HMV all have the "horn" and Nipper dog logo)
Abbreviated as P.U. (Pickup), Gram or Phono on the Radio. In the 1920s they first released Pickup adaptors for windup acoustic Gramophones, in 1930s standalone electric players for the Radio. Originally US used 2 x 1/8" wander plugs like UK did till 1960s. but in late 1930s or early 1940s RCA introduced the coax plug, which as it was most used in USA and for Gramophone plugged into a Radio, or for internal connections on a Radiogram.