The Columbus model 60 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1938.

Other radios based on the same chassis:

Columbus Model 60, 5-valve dual-wave radio with push button tuning

6 pushbuttons, only 4 operate as tuning buttons, the first two are for BC or SW selection.

Several different cabinet styles sighted.

Early models use 6- and 7-pin valves (some chassis' sighted from 1938, so while this set is a 1939 model, its manufacturing began the previous year).

Baby brother of the model 65

1938 Columbus  model 60

Technical Information

Valves (5):
Typical: 6K8G, 6K7G, 6B8G, 6F6G, 5Y3G
Early: 6A7, 6D6, 6B7, 42, 80

Intermediate Frequency: 464kc/s flat-top (see supplement)

Frequency Bands: 2

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

One version of the chassis needs to be removed to tune the pushbuttons, the other version has extension shafts that extend out the back of the chassis, like the model 65, so they can be retuned easily.

Also note that early chassis versions use 6- and 7-pin valves as per the lineup above

1939 Courtenay model 60 Schematic

1939 Courtenay model 60 Service 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.  It can also indicate 'self-biased' in the transition period between back-biased and self biased sets where there were models with both methods employed (53S for example)

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 (2 in total)

1939 Courtenay model 60