The Cromwell model 756 was manufactured for H. W. Clarke Ltd by Collier & Beale Ltd in 1946.

Other radios based on the same chassis:

6-valve plus magic eye tuning, bandspread radio

There is a similar model, the 755, which is almost identical except for the speaker.  The model 756 has a permanent magnet speaker while the 755 had an electromagnetic speaker.

Technical Information

Valves (7): 6U7G, 6K8GT (or alternative), 6Q7GT, 6V6G, 6X5GT and 6U5 Magic Eye

Intermediate Frequency: 455kc/s (not confirmed)

Frequency Bands: 5

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

1946 Gulbransen model 756

1946 Gulbransen model 756

Service information (cb-model-755756-6v-bandspread-ac-1945-46.pdf) here

General Construction Notes for Collier & Beale Ltd:

Model numbering followed no real sensible scheme until around 1940 - and prior to 1934 apparently no model numbers were assigned at all.

From 1940 a 3- or 4-digit system was employed where the first digit indicates the number of valves, the second digit is the number of bands and the third is the year of manufacture.  From 1950 the last digit became two digits, eg: 5151 is a 5-valve broadcast-band only from 1951.

From 1957 model numbers were replaced with model names, ie the Pacemaker Buffalo - which makes the year of manufacture hard to determine unless service info is consulted (although C&B often released service info after the radio, and the date on the service info was for its release, not that of the model.

Other documented models using this chassis (2 in total)

1946 Gulbransen model 756