The tiny broadcast-only Columbus Model 12
Intermediate Frequency: 455kc/s
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)
A small 5-valve mantle-sized chassis used in Columbus and Courtenay sets - designed for AC or DC (transformerless) operation (with modifications). Notable for having a very shallow chassis necessitating a riser spot-welded to the back in order to mount the serial plate
General Construction Notes for Radio Corporation of New Zealand Ltd: The first digit of the serial number typically indicates the year of manufacture of RCNZ chassis' (although not the decade - that requires a little knowledge of the valves, construction, etc). Sets from around 1934 onwards were often (but not always) constructed in a distinctive pressed 'baking pan' style chassis, seemingly unique to RCNZ.
|1940||Columbus model 12 - this set|
|1940||Courtenay model 12|