COLUMBUS MODEL 24 (1937)

The Columbus model 24 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1937.

5-valve broadcast band radio (no shortwave band).  Baby brother of the model 25.

Note - photo shows one of the two available cabinets - see the model 25 for the other style

 

Valves (5 + eye): 6A8, 6K7, 6B7G, 42, 80 and 6E5 magic eye on some models

Intermediate Frequency: 456kc/s

Frequency Bands: 1

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

Shallow / stretched chassis - not baking pan style. Uses 5" RCNZ EM speaker.  Some have a magic eye - known in service info as a 24E, however the chassis code appears to just be '24' on all models regardless of eye.

RCNZ Model 24 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).

All documented models using this chassis (3 in total)

YEARMODEL NAME
1937Courtenay model 24
1937Stella model 24
1937Columbus model 24 - this set