COURTENAY MODEL 75 'SUPER DEFIANT' (1940)

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:
550-1600kc
Shortwave Bands:
9460-9820kc
11400-12120kc
15060-15520kc
17540-18440kc

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.

Model codes beginning with a 0, for example the model 051, are Osram valve versions of the model without the leading 0. Technically the 0 should be an O (for Osram), however the digit 0 was used throughout the site before this fact was discovered.

The E suffix indicates a magic eye option is fitted (in models which were available with or without, such as the model 25).

A and B suffixes appear to be simply updates to the current model, R also appears to be simply an updated model ('R'edesign, perhaps?)

P indicates either a permanent magnet speaker version of a model which also came with an electromagnet speaker (the model 26 for example), or a portable model (like the model 694P).

N and M indicated miniature valve versions of a model which started with all (or a mix, ie: model 5) of larger valves. One of these two codes may indicate a transitional mixture of octal and miniature - clarification is required.

S often indicates a stereo model.

Finally, other suffixes and prefixes make occasional appearances in the RCNZ lineup - like the 66W (a variant of the long-running model 66) and the 75XA (a 10-valve version of the model 75 with a separate amplifier chassis).

All documented models using this chassis (2 in total)

YEARMODEL NAME
1940Columbus model 75
1940Courtenay model 75 - this set