The Skyscraper 5BB was manufactured for Bond & Bond Ltd by Radio (1936) Ltd in 1933.

Other radios based on the same chassis:

5-valve broadcast band radio

The schematic below is for a 5Cx chassis, but should be close.  The actual valve lineup and schematic is not yet known - if you have one or know the details please get in touch.  John Stokes notes this model as being from 1933 although this newspaper clipping is from 1935, so the model may have run across several years, and could have had more than one chassis model inside it over that time as well.

1933 Skyscraper 5BB

Technical Information

Valves (5): 57, 58, 57, 59, 80

Intermediate Frequency: 171kc/s

Frequency Bands: 1

Chassis Notes(most schematics can be clicked to download a full size version)

1933 Ultimate chassis code 5CC (also 5CX in Skyscraper)

As there is no document showing which models had which chassis this is PROBABLY the correct one for this model (4 knobs in this pattern) - please let us know if you can confirm the correct chassis code for this model.

1933 Ultimate chassis code 5CC or 5CX schematic

General Construction Notes for Radio (1936) Ltd: Early Radio Ltd. schematics did not show the models, just the year, valves and bands, so some sleuthing is required to find the right one.

Early 30's Ultimate models with three digit model numbers indicated both the number of valves in the set, and the price it retailed for - for example, the model 856 was an 8-valve radio which retailed for $56 pounds. The equivalent Courier models were reversed, so an Ultimate 856 was a Courier 568 (theoretically, at least). This was the Auckland price though, and often the sets would retail for 1 or 2 pounds more in other centres, presumably to cover the freight cost of moving them around the country from the Auckland factory.

Note the use of old resistance terminology on older schematics: ω means ohms and Ω means megohms.

Some 1936-onward 3-letter chassis codes vary the last letter between brands, for example:
BBU - Ultimate model BB
BBR - Rolls (and Golden Knight) model BB
BBC - Courier model BB
All use the same chassis.

Golden Knight, Courier and Rolls appear to use the same copper-painted chassis while Ultimate chassis' are painted silver

After the war a new model code system was introduced, whereby radio models all began with R - the first model being the RA, a dual-wave 5-valve set commonly released in a pressed tin cabinet.

Other documented models using this chassis (2 in total)

1933 Ultimate model 522