Leak tl 50 plus brochure
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Page 1
For Service Manuals Contact
JMAURITRON TECHNICAL SERVICES
8 Cherry Tree Rd, Chinnor
Oxon OX9 4QY
m- 01944-351696 Fax:»01W35255(
BuarisenquirissLfimauritronooflt
L E A K . . . [be first name in 1-5ng Fidelity
TL/50 PLUS POWER AMPLIFIER
THE MOST POWERFUL VERSION OF
THE WORLD-FAMOUS POINT ONE "" POWER AMPLIFIERS
DESIGNED BY HAROLD ]. LEAK
for
THE PROFESSIONAL ENGINEER and THE MUSIC LOVER
TRADITIONAL LEAK ENGINEERING AND CRAFTSMANSHIP
I can most certainly say at this stage that the workmanship and finish are of a quality which I have never
before encountered in the radio industry, despite the fact that my association with the industry in one capacity
or another extends back over 27 years. I think you are to be congratulated all the more on this achievement
in view of the increasing tendency nowadays towards inferior workmanship and design.
Part of a letter from a purchaser of the 11/12 amplifier who is a very well-known engineer and whose identity is known to
the Editor of " Wireless World."
' POINT ONE" is the Trade Mark of H. I. Leak & Co., Ltd. It was originally applied to the first power amplifiers having
a total distortion as low as point one of one per cent. when, in June, 1945. H. J. Leak, M.I.E.Rie.. revolutionised the performance
standards for audio amplifiers by designing the original POINT ONE " seriesi
Page 2
FUNCTION
The TL/SO PLUS power amplifier has been designed to give the highest possible fidelity. In electrical
performance, reliability. appearance and craftsmanship, it is in advance of earlier Leak amplifiers and similarly
acceptable to the professional communications engineer. For broadcast monitoring, recording, etc., the
amplifier can be supplied with line input transformer, baseplate and top cover.
For public address work the power output permits its use in the largest auditorium. Out-doors, it will
cover crowds dispersed over a 10 acre field when using horn loudspeakers.
For use by the music-lover at home this amplifier will normally follow a Leak Varislope Mono" pre-
amplifier. The output of 50 watts is adequate when the house is Wired for the simultaneous use of loudspeakers
in several rooms.
APPEARANCE AND FINISH
The TL/SO PLUS is finished in blue-steel stoved paint; and all visible accessory fittings are in black.
The general finishes are similar to the TL/12 and TL/ZS, which have operated for years in high-humidity, high-
temperature locations such as Malaya and Hong-Kong.
It is appropriate here to mention one of the basic principles of Leak design. From long experience
and by extreme attention to design details during development work on the pre-production models, we enable
our craftsmen to achieve a high output per man-hour. The labour costs thus saved offset the increased costs
incurred for high-grade materials, components and finishes, and this together with quantity production (made
possible only by a world-wide market) explains how quality products may be sold at reasonable prices.
CIRCUITRY
This is identical with the basic circuit of the TL/12 Plus and TL/25 Plus amplifiers, a 3~stage triple
loop feedback circuit. A low-noise, high-gain pentode feeds into a second-stage double-triode phase-splitter,
which in turn feeds two push-pull output valves (tubes) arranged in the distributed-load condition. The
massive output transformer has a core of high grade orientated steel.
LEAK amplifiers Me the choice of professional engineers such as th: B.B.C. (over 500 delivered), the South Alrican Brondcasring Corporation
(600), [TV and many other Commonwealth and overseas broadcasting and TV systems. who use them for transmitting andy'or monitoring (quality checking)
[he broadcast: to which you listen. Also. many of the ummophone records you buy are out via LEAK amplifiers.