The Ultimate U525 was manufactured by Radio (1936) Ltd in about 1966.

Other radios based on the same chassis:

15 transistor broadcast band stereogram.

Manufactured under Pye ownership

Technical Information

Valves (15 transistor, 2 diode): 2SC378, 1N60 Diode, 2SC371, 2SC371, 1N60 Diode, L and R Amp: [ MPS9638, MPS9638, 2SC371, 2SC371, (AC187 + AC188 Push Pull) ] x 2

Frequency Bands: 1

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

Service information Ultimate_U525_Nottingham_and_Pye_and_Astor_528-2_Burbank_Transistor_Stereogram.pdf

1960 Pye 528-2 'Burbank'

1960 Pye 528-2 'Burbank'

1960 Pye 528-2 'Burbank'

1960 Pye 528-2 'Burbank'

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)

1965 Pye 528-2 'Burbank'