The Bell Colt 5B4 was manufactured by Bell Radio-Television Corporation Ltd in 1954, production ran for 1 year.
This model is part of the Bell Colt series of radios.
Second model of Colt, and early versions were not all that different to the original version.
Early 5B4 models used the original ETA round IF cans, later models had newer square IF's
Early versions also used either the ECH41 or ECH42 mixer / oscillator valve (far left hand side looking from the back). This is easily distinguishable from later models which used the improved ECH81 which had no rimlock base like all the other valves in this set.
The Bell Colt 5B4 is part of the Bell Colt series of radios.
Bell Colts ran from 1951 through until 1980 - the longest running model of NZ built domestic radio. It saw many different engineering changes over the years, and the last few models dropped valves in favour of new transistor technology. There is considerable information on the main Colt page about this Kiwi icon.
The radios in this series are:
1951 Bell Colt Original
1954 Bell Colt 5B4
1955 Bell Colt 5B5
1957 Bell Explorer Colt
1957 Bell Planet Colt
circa 1957 Bell Colt 3B7 Champ Colt
circa 1957 Bell Colt Cadet
circa 1961 Bell Colt All Transistor
1967 Bell Colt 5B67
circa 1968 Bell Solid State Colt
circa 1975 Bell Solid State Colt Mk III
Intermediate Frequency: 462kc/s
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version) Early versions used all rimlock valves, however later versions replaced the ECH41/42 with a noval ECH81. Some chassis' were stamped with 5B4, but not all of them.