Archon Stereo Pre-Amplifier SP31

Archon (Brand) Tansley-Howard Ltd.; London

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  • Year
  • 1960 ?
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 362791

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Powered by external power supply or a main unit.
  • Loudspeaker
  • - For headphones or amp.
  • Power out
  • 20 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Archon Stereo Pre-Amplifier SP31 - Archon Brand Tansley-Howard
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 12.5 x 3 x 6 inch / 318 x 76 x 152 mm
  • Notes

  • The Archon stereo pre-amplifier (SP31) is designed to complement the Archon main amplifier (SL101), offering extensive input selection, precise tonal adjustments, and robust filtering. 

    Technical Features

    • Input versatility: Supports two magnetic pickups, a crystal pickup, radio, and tape sources, with adjustable input sensitivities and precise matching for various cartridges and sources.
    • Controls: Seven front-panel controls (input, volume, balance, channel selection, treble, bass, filter) allow detailed customisation. Input jacks are colour-coded for channel identification; all sources have pre-set gain controls.
    • Tone & Filtering: Separate bass and treble adjustment, rumble, and top-cut filters for precise tonal shaping and noise suppression. Infinite balance control for channel matching.
    • Construction: Utilises advanced feedback for equalisation (first stage), tone control (second stage), and filter shaping (third stage). Compact, open-chassis layout with neat tag-strip wiring.

    Performance and Testing

    • Measured performance: The pre-amp meets or exceeds the maker’s published specifications, indicating tight manufacturing tolerance and quality.
    • Sound quality: Clean, low-distortion, and versatile signal handling across sources, with noise levels and crosstalk well controlled.
  • Net weight (2.2 lb = 1 kg)
  • 4 lb 13 oz (4.813 lb) / 2.185 kg
  • Price in first year of sale
  • 20.48 GB £
  • Mentioned in
  • -- Original prospect or advert (The Gramophone Jul 1960, Page 98.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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