6-valve all-wave radio with magic eye tuning.
Similar to the model CNU (UPDATE: Probably a model CNU or CQU - almost certainly NOT a COU which should be a 5V + magic eye BC set with three knobs)
Valves (6 + magic eye): 6K7, 6K8, 6K7, 6B8, 6F6, 80 and 6U5 Magic Eye (most likely lineup - unconfirmed)
Intermediate Frequency: 460kc/s most likely
Frequency Bands: 3
Chassis Notes(most schematics can be clicked to download a full size version)
No schematic currently held, check the following schematics - first is the CXU, which is a 6V AW chassis from the same year, but configured for ACDC - but the schematic around the output side of the 2nd IF should be similar if not the same to the COU - for the rest of the set check the second schematic which is the 7V version, the CNU - this should also be very similar to the COU apart from the two valves just after the 2nd IF (6H6 and 6F5) which it appears the COU combines into one - probably a 6B8.
General Construction Notes for Radio (1936) Ltd:
Early Radio Ltd. schematics did not show the models, just the year, valves and bands, so some sleuthing is required to find the right one.
Early 30's Ultimate models with three digit model numbers indicated both the number of valves in the set, and the price it retailed for - for example, the model 856 was an 8-valve radio which retailed for $56 pounds. The equivalent Courier models were reversed, so an Ultimate 856 was a Courier 568 (theoretically, at least). This was the Auckland price though, and often the sets would retail for 1 or 2 pounds more in other centres, presumably to cover the freight cost of moving them around the country from the Auckland factory.
Note the use of old resistance terminology on older schematics: ω means ohms and Ω means megohms.
Some 1936-onward 3-letter chassis codes vary the last letter between brands, for example:
BBU - Ultimate model BB
BBR - Rolls (and Golden Knight) model BB
BBC - Courier model BB
All use the same chassis.
Golden Knight, Courier and Rolls appear to use the same copper-painted chassis while Ultimate chassis' are painted silver
After the war a new model code system was introduced, whereby radio models all began with R - the first model being the RA, a dual-wave 5-valve set commonly released in a pressed tin cabinet.
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