The Columbus model 14 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1945.

Model 14 Gainsborough
Columbus model 14 Gainsborough
Model 14 Raeburn
Columbus model 14 Raeburn

Known as the Columbus 'Miniatures' (This range also included the model 6 at this time).  There were two model 14 designs using the same 5-valve broadcast band chassis, the Gainsborough (this model is often referred to as the tramcar due to its unusual shape), and the Raeburn.

Bill Heinz noted in his reflections of working at Radio Corp that the model 14 had a special 'holiday time' assembly line of schoolboys - and this led to a lot of dry joints and other issues in the sets.  Those same schoolboys also had training in-house to learn about radio by studying the Hikers One.  What an opportunity that would have been.

Valves (5): 6K8GT, 6K7GT, 6B8GT, 6K6GT, 6X5GT

Intermediate Frequency: 455kc/s

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

Released over several years, there was a model 14 chassis, a 14A and a 14R.  Differences are not clear, but from examination the GT valves with metal shields from the 14A appear to be changed to metal valves in the 14R - this could have been done by owners over the years though. 14A models appear in 1945-46 and the 14R appears to be 1946-47.

Servicemens notes on schematics show that models with dial scale part# OE22 use a 3-gang Plessey tuner with one gang unused.

Early models have an upright tuning condeser.  Later models (R-variants) have it mounted more traditionally flat-mounted.

Columbus model 14 Schematic

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.