COURTENAY MODEL 25 'NOCTURNE' (1937)

The Courtenay model 25 was manufactured for Turnbull & Jones Ltd by Radio Corporation of New Zealand Ltd in 1937.
This model is part of the 1937 RCNZ Model 24/25 5-valve series of radios.

5 valve plus optional magic eye tuning on some models. 

Low price receiver with an interesting cabinet. 

Seen in CQ, Columbus, Pacific, Stella and Courtenay models

1937 Courtenay model 25 1937 Courtenay model 25

The Courtenay model 25 is part of the 1937 RCNZ Model 24/25 5-valve series of radios.

The models 24 and 25 from Radio Corporation of New Zealand were sold under at least 5 brands (Courtenay, Pacific, Stella, CQ and the newly minted RCNZ house-brand Columbus).  The cabinet design was unusual, and featured a symetrical layout with the edge-lit dial on the left and an edge-lit glass plate showing Australian stations on the right.  At least one Columbus model has been found in Australia so these were probably exported, and the dial would have been to give it some local flavour.

The chassis is not the usual baking pan style, but rather a more traditional welded construction, with the topside components spread to either side to make room for the centrally mounted 5" Radio Corp speaker.

Several different cabinet variations were made, and while specific brands seem to most comonly be found in one specific variant, often sets will be seen in other cabinets suggesting there was no specific cabinet for each brand.

The radios in this series are:
1937 Courtenay model 24 Nocturne
1937 Courtenay model 25 Nocturne
1937 Columbus model 25
1937 Stella model 25 Argo
1937 Stella model 24 Argo
1937 Columbus model 24
1937 CQ model 25
1937 Pacific model 25
1937 Pacific model 24

Technical Information

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

Intermediate Frequency: 456kc/s

Frequency Bands: 2

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

Shallow / stretched chassis - not the typical baking pan style. Uses 5" RCNZ EM speaker.  Some have a magic eye - known in service info as a 25E, however the chassis code appears to just be '25' on all models regardless of eye.

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.

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).

Other documented models using this chassis (5 in total)

YEARMODEL NAME
1937 Columbus model 25
1937 Stella model 25 Argo
1937 CQ model 25
1937 Pacific model 25