The Gulbransen model 7150A was manufactured for H. W. Clarke Ltd by Collier & Beale Ltd in 1950.

Other radios based on the same chassis:

7-valve car radio, also released as Cromwell, Pacemaker and Skymaster

Better photos on Pacemaker model

1950 Gulbransen 7150A

Technical Information

Valves (7): 6BA6, 6BE6, 6BA6, 6AT6 / 6AV6, EF22, 6V6GT

Intermediate Frequency: 455kc/s

Frequency Bands: 1

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

Note, 12V voltages are approximately 12% higher than indicated in schematic

1950 Gulbransen 7150A

Service information (CB_-_model_7150A_-_7V_BC_Battery_-_automobile_-_1952.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)

1950 Pacemaker model 7150A 'Car Radio'