5-valve dual-wave set. Superseded by the model 27N which used miniature valves.
Intermediate Frequency: 455kc/s
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.
Official schematic, 2 September 1948 - almost one year later.
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.