The Columbus model 708 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1957.

Believed to be the Columbus Somerset De Luxe.  This is a 6-valve + magic eye dual-wave radio, and it is believed to be the big brother of the 705 Somerset.  This is all based on advertising pictures and descriptions - actual pictures of a 708 would help clarifiy this.

Columbus Somerset - probably the 708

Valves (6 + magic eye): 6BA6, 6AE8, 6BA6, 6AV6, 6AQ5, 6X4 and EM80 Magic Eye

Intermediate Frequency: 455kc/s

Frequency Bands: 2

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

1957 Columbus model 708 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.