The Courtenay model 75 was manufactured for Turnbull & Jones Ltd by Radio Corporation of New Zealand Ltd in 1940.

Courtenay version of the Model 75 bandspread receiver - and the first bandspread radio designed and manufactured in New Zealand (and almost the first in the world).  The model 75 is a 6-valve + magic eye set.

There is considerably more information on the model 75 under the Columbus version, which is virtually identical except for the cabinet design and dial glass branding.

1940 Courtenay model 75

Valves (6 + eye):
first version: 6K7G, 6K8G, 6K7G, 6B8G, 6F6G, 5Z4G and 6U5 Magic Eye
second version: KTW61, X65, 6K7G, 6B8G, 6F6G, U50 and Y63 Magic Eye

Intermediate Frequency: 455kc/s

Frequency Bands: 5

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

1940 Courtenay and Columbus model 75 Schematic

1940 Courtenay and Columbus model 75 Schematic Supplement

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 (2 in total)

1940Columbus model 75
1940Courtenay model 75 - this set