COLUMBUS MODEL 90

Manufactured for Columbus Radio Centre Ltd by Radio Corporation of New Zealand Ltd in 1942, production ran for 8 years.

The model 90 followed the model 75 as the second bandspread receiver from Radio Corp.  There was some overlap between the model 75 finishing and the model 90 starting - and they were quite similar in chassis appearance although quite different in circuitry. 

 

Unlike the model 75, the 90 had very few changes over its realtively long life.

Valves (6 + eye): 6K7G, 6J8G, 6B8G, 6J7G, 6F6G, 5Y3G, and 6U5 Magic Eye

Intermediate Frequency: 455kc/s

Chassis Notes: Bands:
1. Broadcast  (550 - 1600kc/s)
2. Shortwave (6 - 18mc/s)
3. Shortwave (14.85 - 15.73mc/s)
4. Shortwave (11.65 - 12.2mc/s)
5. Shortwave (9.45 - 9.75mc/s)

 

 

1942 Columbus model 90 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.