BELL No. 59A & BELL No. 59A Unmounted
Magneto bell (AC) similar to Bellset No. 26, but has no capacitor fitted.
Used extensively as an extension bell for internal use only.
Picture to the right shows a black plastic covered bellset. The paper
bag contained three round headed screws for fitting the bell to a wall.
The early cover was replaced circa 1975 with a thinner plastic cover coloured black, grey or ivory.
The early covers were Part No. 1/SCO/1 (Colour), the black version being produced in Phenolic Resin, Type GX (Specs BS771 & S116).
The later cover was called the Cover No. 71A (Colour) and made of Toughened Polystyrene Type 1 (Specs BS3126 & S116).
The early cased bell sets could be fixed under a 100 or 200 type table telephone. Special fixing screws are required which supplied as standard on the earlier bell sets. A Cord, Inst., No. 4/51H, Brown, 9" or Cord., Inst., No 5/22H, Brown, 9" would also be required.
Normally fitted with matched bell gongs, but where a distinctive tone is
required, the following combination of 2.5in gongs can be provided:-
Diagram - N659.
Drawing - 63036.
Converting a Bell No. 59A to work in the UK
Bell No. 59 Unmounted
This is the bell ringer itself and this could be fitted in telephones, bells or bellsets. They operate to 75volts at 17hz and 25hz.
There are two variants - the Mark 1 which has the round magnet and the Mark 2 (pictured above) which has an oblong magnet.
This bell ringer could also be fitted with a Spring, Bias (Part 2/SSP/593). The spring was used to stop bell tinkle.
Bells No. 59A unmounted = Twin 500 ohm coils, used in bellsets and 300
type telephones (solder tags). Mark 1.
Bells No. 59AA unmounted = Twin 500 ohm coils, with a bracket for fitting
into wooden bellsets and telephones (solder tags). Mark 1.
Bells No. 59A-1 unmounted = Twin 500 ohm coils, used in Telephones No. 706, 710 etc (two fly leads
fitted with tags). Mark 2.
Bells No. 59B-1 unmounted = Twin 500 ohm coils, used, used in Telephones No. 706 with printed circuit board (for coil tags directly soldered to board). Introduced in October 1959.
Bells No. 59C-1 unmounted = Twin 500 ohm coils, used in Telephones No. 746, 740 etc. Introduced in February 1967. Mark 2.
Bells No. 59D-1 unmounted = Twin 2000 ohm coils, used to convert old apparatus to PST/new plan (two fly leads with tags) - shown above. Introduced in January 1980.
Specification - S91.
Last revised: August 27, 2023