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

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.