The Sheffield model S20 was manufactured by Sheffield Radio Ltd in about 1936.

6-valve dual-wave set.  Model code believed to be correct.  Age is based on station ID's on the dial:

Absent, 1ZH ceased 1935
Absent 2ZB, 4ZB started 1937
Present 3XL, 4YO started 1934

Original construction is quite crude, showing how far Sheffield came as a company to their well constructed and tidy sets in the 40's.  Dial looks like two paint tin lids.

Photos and restoration by Tim Sanders.

Technical Information

Valves (6): 6K7, 6J8, 6U7, 6B6, 6V6, 80 ( 5Y3 ?)

Frequency Bands: 2

Chassis Notes(most schematics can be clicked to download a full size version)

1936 Sheffield Dual Wave Schematic