5-valve broadcast-band radio - one of the first models produced after the war, and most were released in pressed tin and pinex cabinets due, it is said, to shortages of veneer
Intermediate Frequency: 460kc/s
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)
The RA and RB chassis' were the first Radio Ltd designs to use a cord clamp rather than the previously used knot. They were also the first Radio Ltd set to use a 6X5 rectifier.
The chassis was plated rather than painted as was previous practice.
Speakers on early models were EM, but this was quickly changed to use of a choke and PM Rola speaker with a diamond-shaped magnet. Later models used a Rola speaker with a round magnet.
The layout changed during production - notably the transformer is at the back on the right on some, and further forward with the output valve and rectifier at the back right.
On some later models the separate rectifier 6.3V winding was removed and the rectifier was run from the 6.3V winding for all other valves in the set
Some models have different tuning parts meaning the dials are opposite (ie: some have the low end of the band at the bottom, some at the top)
Much of this information has come from Bill Farmer, who started work at Radio Ltd in 1945, by way of an article by Murray Stevenson in the NZVRS magazine in May 2000.
|1945||Skyscraper RB - this set|