The Columbus model 44 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1948.

A good performing 6-valve set plus magic eye all-wave radio which used a 10½" eliptical permanent magnet speaker developed out of step with the circular electromagnetic speakers that RCNZ were using in most sets at this time - this was the flagship model of this series at the time and incorporated other new features such as a tuned filter in the power supply, and a 6V6 rather than the 6F6 other RCNZ sets were using.  Big brother of the model 34 Oxford.  There was also a model 61 dual-wave set in this series.

1948 Columbus model 44

Valves (6 + magic eye): 6K7, 6K8, 6B8, 6SJ7, 6V6, 5Y3 and Y63 Magic Eye

Intermediate Frequency: 455kc/s

Frequency Bands: 3

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

1948 Columbus model 44

1948 Columbus model 44

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).