More 1920s radio components
1920s home-built radio chassis
Early Hallicrafters receiver
HRO; "much modified"
The HRO was available in large numbers
after WWII and was used as the basis for pepping-up using modern
valves by many radio amateurs. The awkward tuning arrangement
wasn't important when looking over an amateur band. All you needed
to know was the band edge settings on the dial. Actual frequency
was relatively unimportant. The resetting accuracy using the
dial's vernier reading was very useful.
The design of the HRO must have been
good as both the Japanese and the Germans copied it during WWII.