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.