COLUMBUS 66A (1946)

The Columbus 66A was manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1946.

6-valve dual-wave (bandspread) radio.

Models 66A and 66W were updated versions of the original model 66.

Valves (6): 6K7G, 6J8G, 6B8G, 6J7, 6V6G, 6X5G

Intermediate Frequency: 455kc/s

Frequency Bands: 2

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

66A uses dial scale OE8 and Plessey E 3-gang tuning gang
66W uses dial scale OE27 and R.C. Co. 317 tuning gang

Tone control has two variations, as shown on the schematic

1946 Columbus 66A

1946 Columbus 66A

1946 Columbus 66A

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).