The Courtenay 5B was manufactured for Turnbull & Jones Ltd by Radio Corporation of New Zealand Ltd in 1932.

Early Courtenay model 5B.  5-valve broadcast band set.  At some point a radio serviceman has noted that this model was similar to the 5A, but a slightly different valve lineup and made notes on the 5A schematic as seen below.

1932 Courtenay 5B

Valves (5): 57, 58, 224, 247, 280

Frequency Bands: 1

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

1932 Courtenay 5B

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.