BJ Tangential Tonearm
Magnum (brand) Burne-Jones & Co. Ltd.; London
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Magnum (brand) Burne-Jones & Co. Ltd.; London
- Year
- 1954 ?
- Category
- Microphone or Pick-up element
- Radiomuseum.org ID
- 331813
Click on the schematic thumbnail to request the schematic as a free document.
- Wave bands
- - without
- Power type and voltage
- No Power needed
- Material
- Bakelite case
- from Radiomuseum.org
- Model: BJ Tangential Tonearm - Magnum brand Burne-Jones & Co.
- Dimensions (WHD)
- 215 x 65 x 50 mm / 8.5 x 2.6 x 2 inch
- Notes
-
The Burne-Jones tangential BJ Arm was invented to minimize tracking errors on record players.
Here's the issue:
- Records have grooves cut in a straight line across the disc.
- Traditional record player arms pivot on the side, causing a slight angle when following the curve of the groove.
- This angle introduces tracking errors, affecting sound quality.
The BJ Arm addressed this by:
- Using a pivoted design that tracked the groove tangentially (in a straight line).
- Minimising tracking errors almost to zero for better sound reproduction.
However, the BJ Arm had limitations:
- Complexity: The design was intricate, making it expensive to manufacture.
- Cost-cutting: To keep the price down, lower-quality bearings were used.
- Rigidity: This resulted in the arm being less rigid than standard arms, potentially affecting performance.
Despite these drawbacks, the BJ Arm enjoyed popularity among hi-fi enthusiasts for over a decade due to its significant reduction in tracking errors.
See the later improved version BJ Super 90.
- Net weight (2.2 lb = 1 kg)
- 0.140 kg / 0 lb 4.9 oz (0.308 lb)
- Price in first year of sale
- 3.00 £
- Mentioned in
- Wireless World (The), London (WW, 79) (Nov 1954, Page 114.)
- Literature/Schematics (1)
- The Gramophone - August 1954
- Author
- Model page created by Stan Roberts. See "Data change" for further contributors.
- Other Models
-
Here you find 23 models, 17 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Magnum (brand) Burne-Jones & Co. Ltd.; London
Collections
The model BJ Tangential Tonearm is part of the collections of the following members.