Delta 30 amplifier

Leak, H.J.; London

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  • Year
  • 1972
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 192417

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 110; 117; 130; 210; 230; 250 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Power out
  • 30 W (40 W max.)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Delta 30 amplifier - Leak, H.J.; London
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 344 x 118 x 238 mm / 13.5 x 4.6 x 9.4 inch
  • Notes

  • A stereo hi-fi integrated amplifier with output power of 15 watts per channel into 8 ohms. RCA input sockets for Disc 1, Tuner 1, Disc 2 and Tuner 2 (both with high-low impedance switches), RCA input/output sockets for tape record/replay, DIN input/output socket for Tape, 2 pin DIN sockets for 1 pair of loudspeakers, voltage selector and 2 unswitched AC outlets. Rotary controls for Bass, Treble, Balance and On/Off/Volume, rotary selector switch (Tuner 1 Mic, Tuner 2, Replay, Disc 1 and Disc 2), five push buttons for Mono Input L and R, Tape, Filter and Loudspeakers. Jack for headphones.

    Specification  
    Rated Power Output
    (both channels sine-wave drive at 1kHz):    		 15+15 watts into 8Ω  
    10+10 watts into 15Ω
    20+20 watts into 4Ω
    Total Harmonic Distortion 0.1% at ALL power levels up to 10 watts at 1KHz each channel into 8Ω.
    Total Intermodulation Distortion
    Input - 70 Hz and 7 kHz in ratio of 4:1    		 Less than 0.2% for ALL power levels up to 15 watts into 8Ω.
    Hum and Noise 63 dB below 15 watts into 8Ω load on TUNER and REPLAY and 53 dB below 15 watts on other inputs.
    Cross Talk Between L and R channels.

    -50 dB up to 1kHz and -30 dB at 10 kHz.
    Frequency Response: 30 Hz to 20 kHz (±1 db)
    Damping Factor 40 measured at 1kHz for 15Ω
    20 measured at 1kHz for 8Ω
    Input Sensitivities             
     'Disc 1' (RIAA Characteristic) 2mV at 1 kHz Input Impedance 47kΩ.
     'Disc 2' (RIAA Characteristic) 10mV or 30 mV at 1 kHz Input. Impedance 33kΩ 100kΩ Selected by switched input attenuator marked 'high' and 'low' on rear panel.
    'Tuner 1 Mic' 25 mV or 2 mV
    47kΩ 47kΩ
    'Tuner 2' 60 mV or 250 mV
    5kΩ 50kΩ
    Selected by switched input attenuator marked 'high and 'low' on rear panel.
    'Replay' 400 mV
    47kΩ

     

  • Mentioned in
  • Radio bulletin 1973
  • Literature/Schematics (1)
  • Advertisement - Suono HiFi Stereo, n.13, Agosto 1972 - Italy
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Leak Delta 30 amplifier Delta 70 amplifier service manual)
  • Author
  • Model page created by Hugo Sneyers. See "Data change" for further contributors.

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