Power Amplifier A51

Sugden, J.E., Heckmondwike, West Yorkshire

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  • Year
  • 1969–1972
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 314494

 Technical Specifications

  • Number of Transistors
  • 20
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 120; 220; 230; 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 50 W (undistorted)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Power Amplifier A51 - Sugden, J.E., Heckmondwike,
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 343 x 216 x 254 mm / 13.5 x 8.5 x 10 inch
  • Notes

  • A stereo power amplifier with Class A output of 25 W per channel into 8 Ω. Socket for connection to a Sugden Control Unit. Later fitted with a separate power outlet for a Sugden Control Unit. Terminals for one pair of loudspeakers, 8 Ω or 15 Ω.

    SPECIFICATION (all levels quoted ±1 dB unless otherwise stated)
    Power output:

    25 WRMS per channel
    (50 WRMS both channels simultaneous operation)
    at clipping level into 8 or 15 Ω
    Total Harmonic Distortion:
    (measured at 1 kHz into 15 Ω)    		 At 20 WRMS per channel - better than 0.05%
    At 1 WRMS per channel - better than 0.01%
    Frequency & Power Response: ± 0.5 dB, 30 Hz - 20 kHz
    ± 1.0 dB, 20 Hz - 30 kHz
    Rise Time: 5 µs
    Signal to noise ratio:
    (10 kΩ source)    		 90 dB
    Sensitivity for 25 WRMS
    per channel output:    		 600 mV
    Input impedance: 200 kΩ
    Output impedance: 0.25  Ω
    Load stability: Unconditional
    Power Consumption: 100 W
  • Net weight (2.2 lb = 1 kg)
  • 10 kg / 22 lb 0.4 oz (22.026 lb)
  • Mentioned in
  • -- Original prospect or advert (J.E. Sugden Class A Amplifiers brochure)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Schematic)
  • Author
  • Model page created by Howard Craven. See "Data change" for further contributors.

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