The film discusses the crucial role of vacuum tubes in radio broadcasting, detailing the various jobs involved in the industry, from production and scriptwriting to technical maintenance and ...

This allowed [David] to move on to building the (obviously 6AU6 tube-based) amplifier for the photodiode output signals. Much like the Bendix G-15’s tape reader which served as inspiration ...

The radio looks very similar to an Eico of the same era — around the 1960s. With seven tubes, radios like this would soon be replaced by transistorized versions. [Jeff] gives us a look at the ...