The Rolax Colt was manufactured for Sedley Wells Ltd by Bell Radio-Television Corporation Ltd in 1953.

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

Valves (5): ECH41, EF41, EBC41, EL41, EZ40

Intermediate Frequency: 462kc/s

Frequency Bands: 1

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.

All documented models using this chassis (3 in total)

1953Skymaster Colt
1953Rolax Colt - this set
1951Bell Colt Original