• Country
• Great Britain (UK)

• Manufacturer / Brand
• Sullivan, H.W., London

• Year
• 1923

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 205009

• Number of Tubes
• 1

• Valves / Tubes

• Main principle
• Audio-Amplification; 1 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: Single-Valve Note Magnifier No. 521 - Sullivan, H.W., London

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes
• H. W. Sullivan LTD. Sullivan Broadcasting Receivers - Single-Valve Note Magnifier List No. 521 This audio amplifier was for the No. 512 Two-Valve Cabinet Receiver

• Price in first year of sale
• 7.00 GBP

• Literature/Schematics (1)
• April 7, 1923 The Wireless World & Radio Review ad on Rear Cover

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 33 models, 31 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sullivan, H.W., London