The Columbus model 25 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1937.

Dual-wave version of the budget-model 24.  2 different known cabinets, most seem to have been sold in the round shouldered version.

Photos above show one with bakelite trims around the windows.  This example was seen in Australia and could have been an export-only feature?

Valves (5 (+ eye on some)): 6A8, 6K7, 6B7, 42, 80 and 6E5 magic eye on some models

Intermediate Frequency: 456kc/s

Chassis Notes (most schematics can be clicked to download a full size version): See model 24 for details.

RCNZ Model 25 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.

All documented models using this chassis (3 in total)

1937Courtenay model 25
1937Columbus model 25 - this set
1937Stella model 25