What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Leak Point One Stereo


 Leak "Point One Stereo" (circa 1958)
Effectively a stereo version of the Varislope III, but with the Varislope circuit removed. Bass and treble circuit is the Baxandall circuit. Four EF86 valves are used - two for each channel.
  
The Point One Stereo pre-amplifier is designed specifically for use with the Stereo 20 or Stereo 50 power amplifiers, though it may also be used with any combination of two Leak monaural power amplifiers ( TL/12, TL/10, TL/12 PLUS, TL/25 PLUS,  TL/50 PLUS)


 "The Point One Stereo pre-amplifier is probably the most comprehensive unit in existence covering every refinement for stereo tape, disc and radio plus monaural amplification for any form of input signal … it is difficult to think of any additional requirement that one would ever wish. The equipment performs with the high performance always associated with the tradition of Leak equpment. It is a fine example of design and construction, and the pre-amplifiers can be used with any other leak main amplifiers. How the pre-amplifier can be sold for as little as £21 can be answered only by Harold Leak …  Summing up, therefore, one can highly recommend the Leak stereo system for use with any current monaural or stereo input whether it be from pickup, tape, radio or microphone."



Electrical Specifications:
Sensitivities/Input Impedance for 125 mV output :
Pickup (RIAA characteristics) :  3 – 5 mV/70 k – 100 kOhms
Tuner  :  35 mV/70 k – 100 kOhms
Extra  :  35 mV/70 k – 100 kOhms
Microphone  :  2 mV/120 kOhms
Tape Head (CCIR Characteristics) :   3 mV/120 kOhms
 Bass control :  ±14 dB at 50 c/s
Treble control :  ±14 dB at 20 kc/s
 Harmonic Distortion :  Less than 0,01% for 125 mV output.
Hum and Noise :  approx.  60 dB below full power output on tuner or extra and 52 dB below on other inputs.

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