Point One

Leak, H.J.; London

  • Year
  • 1955 ?
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 114277

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

 Technical Specifications

  • Number of Tubes
  • 2
  • 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.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Point One - Leak, H.J.; London
  • Shape
  • Book-shelf unit.
  • Notes
  • A Mono Pre-Amplifier, to use with the Leak TL/10, TL/12 or TL/25 Power Amplifiers.

    Circuit: A low distortion on two-stage feedback tone control pre-amplifier that draws its   L.T. and H.T. supplies from the main amplifier.
    Input Selector: A six-position switch for choice of inputs from:
     Tuner: Response, level. Sensitivity 80 mV. r.m.s.
     Records: Sensitivity 14 mV.
     There are four separate characteristics available, these being:-
       (a) Audio Engineering Society and RCA New Orthophonic.
       (b) Columbia (U.S.A.) LP and Decca (London) FFRR LP.
       (c) National Association of Radio & Television Broadcasters
          and H.M.V. (Angel) LP.
       (d) BRITISH 78.
     Tape: Response, level. Sensitivity 80 mV. r.m.s.
          Input resistance, 100kΩ .
    Treble Control: Continuously variable from +9dB to-15dB  at 10 kHz.
    Bass Control: Continuously variable from +12dB to +13dB at 40 Hz.
    Volume Control and Switch: The switch controls the amplifier.
    "From Tape Replay Amp.": This input jack accepts signals from a tape replay amplifier.
    "To Tape Record Amp.": This jack permits the user to record on to tape from radio or   records when using a recorder embodying a low level recording amplifier.
    The following components are mounted on the rear of the pre-amplifier:—
       (1) Co-axial plugs and sockets for tuner and pick-up connections.
       (2) Pre-set controls for adjustment of inputs from tuner and pick-ups.
       (3) A terminal strip to which a load resistor may be fitted for
           the correct matching of various types of pick-ups.
       (4) An octal socket, marked "Tuner" from which H.T. and
           L.T. supplies may be drawn for a tuner unit.
       (5) An octal male socket for connecting to the power amplifier:
    Dimensions: Front panel, 10¾ x 3½". Chassis, 9⅜ x 2¾' x 3¾" deep.
       Finish: Front Panel in gold. Black lettering and knobs.

  • Source of data
  • -- Collector info (Sammler)
  • Mentioned in
  • -- Original prospect or advert (Brown Brothers Ltd 1955 Catalog No. 520 Page 125)

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The model Point One is documented in the following literature.