• 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