7 + 7 Watt Stereo Amplifier STA7

Radford Electronics Ltd.; Bristol

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  • Year
  • 1960 ?
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 360550

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Alternating Current supply (AC) / 50 Hz, 210; 230; 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: 7 + 7 Watt Stereo Amplifier STA7 - Radford Electronics Ltd.;
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • The Radford STA7 is an extremely rare model in the Radford STA series of vacuum tube audio amplifiers. This 7 + 7 Watt stereo amplifier features a push-pull output configuration and utilises the following vacuum tubes:

    • 1x ECC83
    • 4x ECL82
    • 1x EZ81

    While detailed specifications for the STA7 are scarce due to its rarity, we can infer some additional information based on its design and the Radford amplifier lineage:

    1. Output Power: 7 watts per channel
    2. Circuit Design: Push-pull configuration
    3. Transformer Specifications: The original hand-written specifications for the STA7's output transformers still exist, indicating its authenticity as part of the Radford amplifier series

    The STA7 likely shares some characteristics with other Radford amplifiers of its era:

    • High-quality output transformers, a hallmark of Radford designs
    • Possibly a variation of the classic Philips/Mullard circuit used in other Radford amplifiers
    • Potentially lower plate voltage for the output tubes, contributing to a sweet, detailed sound, similar to the STA12

    Given its low power output and rarity, the STA7 may have been a specialised or limited production model within the Radford lineup. Its existence alongside more powerful models like the STA15 and STA25 suggests it may have been designed for specific applications or to meet market demands.

  • Literature/Schematics (1)
  • - - Manufacturers Literature
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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