Concept elc brochure

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@CODNCCEEPW

The Ultimate in
Sound Reproduction

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@©[N]@EPT EIL©

The Design

The design goal for any Concept
product is to be the ultimate in sound
reproduction. Our research and success
with the high-technology Concept elec-
tronics and Concept Constant Energy
loudspeakers made us acutely aware of
the need for a better recording instru»
ment. Our goal was to match the per-
formance of the highest quality open
reel decks without the attendant
expense, and at the same time retain
the base convenience of the cassette
format.

As our preliminary design work pro-
ceeded. thorough examination found
available technology and its application
to be inadequate. Most existing cassette
decks suffer from limited frequency
response, restricted dynamic range,
excessive distortion and other electronic
limitations and as often from clumsy,
imprecise tape transports. The several
really good examples require complex,
repeated adjustment and are priced out
of reach to all but a select few.

In order to achieve both convenience
and outstanding specifications, we
needed a new technology for both the
tape transport and the electronics. An
intensive foureyear development pro
gram transformed the idea into labora-
tory prototypes and finally into an
uncompromlsed product. The final result
is the superb Concept ELC, a most ex»
ceptional cassette deck. Listen to the
Concept ELC, the ultimate in sound
reproduction.

The Transport Technology

The Concept ELC transport is
superior in several significant respects. It
utilizes two motors, each speCiaIized for
different functions To achieve rock-
steady speed, a precision DC motor is
driven by an electronic, self- correcting
servo circuit. This motor drives only the
capstan via an oversized, balanced fly,
wheel. It operates at only one speed-
exactly.

Hugged dual motor transport has tewer
moving parts

For improved fast winding, the
Concept ELC uses a DC high-torque
motor that is both strong and quiet.
Powerful industrial-grade solenoids lock
the cassette firmly for exact, repeatable
tape-to-head contact. Because all
mechanical functions are switched elec-
trically, the Concept ELC dispenses with
complex levers, clutches, pulleys and
springs, all of which are subject to wear.
The elegant mechanical simplicity of the
Concept ELC prowdes far greater long-
term adherence to the exacting original
specifications as well as vastly
increased reliability.

Electronic Logic prevents the ELC
from acting on conflicting accidental or
careless commands; it establishes priori-
ties for fast, accurate tape handling.
Each control button incorporates a light,
emitting diode (LED) to give you visual
indication of the transport function
engaged.

Concept ELC wow and flutter, IEC weighted
Each horizontal division is 7 second
Guaranteed spec is 04%. this sample
measures only 03%

Electronic Logic Controls

The Concept ELC takes its name
from the unique computerderived
Electronic Logic Controls, Feather-touch
buttons activate an electronic brain"
that controls the functions of the motors
and solenoids, Tape motion is controlled
by circuitry that senses and reacts to
tape movement; when you switch direc-
tions, the ELC automatically pauses
before changing to eliminate stress on
the cassette. The circuitry even applies
a measured voltage to instantly bring
the tape up to speed within its wow and
flutter specs

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Generous machined flywheel and capstan

revolve in precision bearings. Solenoids are
industrial-grade.

Electronic logic control board lCs replace
function of thousands of transistors

The Circuitry

The hallmark of every Concept
product is a standard of accuracy
unmarred by significant audible or
measurable distortion. The ELC recor-
ding and playback preamplifiers are built
to provide startling dynamic range with
out compromising this design goal.
Hand-picked transistors assure a superb
signal-tonoise ratio; close-tolerance
capacitors and resistors result in
perfectly complementary record/play
equalization, critical for accurate
reproduction.

The advanced Dolby Noise Reduc-
tion circuits of the ELC are contained in
speCiaI integrated circuits (lC's) for even
greater hiss reduction without impair-
ment of frequency response The Dolby
circurts can also be switched to decode
Dolby-encoded FM broadcasts; the cor-
rect 25 psec de-emphasis standard is
automatically selected with this button.