Both sighted examples are brown with brown domed knobs and have an early serial number, the photographed example here being a 1953 original Bell Colt chassis. Effectively a Bell Colt, including the dial (except for the Rolax name in place of Bell - but interestingly even the bells either side of the name are still present).
Possibly a badge-engineering arrangement to boost sales of the new Bell model in the South Island - Bell was an Auckland based company and Rolax was a Christchurch based brand.
This arrangement seems to have been limited to 1 or 2 years right at the start of the Bell Colt era.
The only other known re-branding of the Colt was for Bond and Bond under the Skymaster brand
Intermediate Frequency: 462kc/s
Chassis Notes (most schematics can be clicked to download a full size version): David Clist noted an issue with the tone control circuit producing high harmonic distortion at the full bass position - although as most people never set the tone control here its unlikely anyone would have ever noticed. RJ Hatton notes in his 3-part series on the Colt (October 2004) that 100pF caps in this model could prove to be unreliable and cause a crackling sound (possibly a form of silver mica disease). I.F. transformers are ETA round-cans. These were on early 5B4 models as well.
|1951||Bell Colt Original|
|1953||Rolax Colt - this set|