Other radios based on the same chassis:
5-valve dual wave radio.
Referred to in service literature as the C520 (even though the badge only states '520'), and electrically identical to the Gulbransen G425.
BAY OF PLENTY TIMES, 19 JULY 1940
Intermediate Frequency: 465kc/s
Frequency Bands: 2
Chassis Notes(most schematics can be clicked to download a full size version)
Service information cb-model-g425-and-c520-5v-dw-ac-1940.pdf
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.
| YEAR | MODEL NAME |
|---|---|
| 1940 | Gulbransen model 425 'Clipper' |
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