The Courtenay model 27 was manufactured for Turnbull & Jones Ltd by Radio Corporation of New Zealand Ltd in 1948, production ran for 3 years.

The new 5-valve dual-wave table radio for 1948 which used octal valves and would be one of the last Courtenay models to do so.  This design would see two electrical updates, in 1951 and '52, using the new miniature valves: Coded the 27N and 27M respectively.

1949 Courtenay model 27

Valves (5): 6K8, 6K7, 6Q7, 6V6, 6X5GT

Intermediate Frequency: 455kc/s

Frequency Bands: 2

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

Original lab drawing for the model 27, 6 November 1947.  These lab schematics were distributed as photographs, presumably the quickest way at the time for them to mass copy information to allow Columbus Radio Centres and Turnbull & Jones service agents access to service info before the official documentation had been prepared and printed.

1949 Columbus model 27 lab schematic

Official schematic, 2 September 1948 - almost one year later.

RCNZ Model 27 Schematic

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.

All documented models using this chassis (2 in total)

1948Columbus model 27
1948Courtenay model 27 - this set