The Courtenay model 108 was the first aero-dial (round dial) set from Radio Corp NZ. The circuit is virtually identical to sighted valve-dual-wave">Pacific 6-valve Dual Wave chassis' found in the likes of the Pacific Elite, Raleigh, etc. although most sighted Pacific sets (except the very early chassis') used the 6.3V versions of the same valve lineup.
There is rarely seen cabinet design (shown above), which was probably the factory using up remnant stocks of the ornate semi-cathedral cabinets from the previous years model 106.
In the following year, the model 8 would use a variation of the main 108 cabinet - albeit up the other way though, with the speaker on the bottom.
OTAGO DAILY TIMES, 24th NOVEMBER 1934
Intermediate Frequency: 256kc/s
Frequency Bands: 2
Chassis Notes(most schematics can be clicked to download a full size version) The 108 is one of the first to use the baking-pan style chassis.
Service information (RCNZ_-_model_108_Courtenay_Pacific_-_6V_DW_AC_-_1935.pdf) here
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).
Model nicknames are often sourced from either newspaper advertising, company literature or the NZ Radio Traders Federation official trade-in price books (Particularly Courtenay models from this publication)