COLUMBUS MODEL 35 (1938)

The Columbus model 35 was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1938.

The Columbus version of the model 35 has two distinctly different styles due to two different chassis versions.  It appears the early version uses an escutcheon and round dial-style as found on older models like the 1937 model 38 spiral dial set - with mechanical 'eyes' showing the volume and tone settings.  This appears to have been removed in favour of a simpler oval dial design with no other indicators other than the magic eye on the later sets.

Valves (5 + eye):
Early Version: 6A7, 6D6, 6B7, 42, 80 + 6E5 Magic Eye
Later Version: 6J8G, 6K7G, 6B8G, 6F6G, 5Y3G + 6E5 Magic Eye

Intermediate Frequency: 456kc/s

Frequency Bands: 2

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

Two known versions of the chassis - the first used 6- and 7-pin valves while the later revision uses octal valves and (at least in the Columbus version) has a simpler dial assembly.

1938 Columbus and Courtenay model 35 Schematic

1938 Columbus and Courtenay model 35

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
1938Courtenay model 35
1938Columbus model 35 - this set