Tandberg TCA 3018 A Brochure 2

Page 2

Zero Negative
Feedback

Tandbergs preamplifiers
and power amplifiers contain
zero negative feedback The
result of this is remarkable
sound reproduction. Purity,
transients, openness,
resolution and imaging are
unparalleled # an distinct
improvement over Widely
employed by the industry
negative feedback design.

By using very special
circuit topology elements
with high quality and
tolerances unheard of in

regular mass production,
together with an ingenious
layout of the circuit boards
and component selection,
it has been possible to build
a zero feedbak amplifier.

in addition, distortion has
been kept at the same or
lower levels than traditional
designs.

The linearity of the
amplifiers are maintained at
all levels and with all loads.

No negative feedback also
means no need for stability
compensation, no stability
problems, no internal circuit
overload or conditional
stability, How this affect
sound reproduction is
remarkable] Transients.
openess, perspective, focus.
resolution . . .everything

IS enhanced With this
technology. The best proof
is to compare the
performance of the
Tandberg sets with any
other "high end product.

TCA 3018 A
High level inputs

RIAA

Separate power
supplies

All high level inputs on
TCA 3018A offer an
overload rating in excess of
20 Volts!

No matter how dynamic
the source is, it will not
overload the input.

Passive Fhono E0. Both
phono sections, MC/MM.
use passive HF. and L.F.
sections.

Through a common trans-
former the TCA 3018A
has separate windings and,
therefore, separate power
supplies for left and right

Therefore the phone stages
have zero feedback resulting
in no sonic degradation.

channels. This means that
the channels are completely
separated withom
interference between left
and right. The two power

supplies, which incorporate
high speed regulated voltages
and stiffness. result rn
better sound.

TPA 3016 A
Two mono
amplifiers.
AC electronic
governed fan

'Rock solld'
power supplies

Superior current
capability

Feedforward
driver stages.
MOSFET
output stages

Thermic
Servo Loop

TPA 3016A consists of two
separate power stages with
only mains switch and fan
in common. The fan is
electronically controlled by
the temperature of each
separate heatsink. Only
under very demanding
situations will the fan be
activated, and only as much

as needed to keep the
transistors at an optimum
working temperature.

The fan automatically starts
at GOEC and accelerates its
speed to ensure that the
amplifiers temperature does
not exceed 7oc.

The heatsinks are also very
effective without the fan
since the transistors are
mounted on the outside of
the amplifier improving the
cooling through natural
convection.

A power amplifiers ability
to maintain control with all
loads, is very dependent on
the stability of the power
supply where it is bound to
get the current whenever it
needs.

Even small voltage
modulations of power

are audible (unstable
perspective and not fully
controlled bass). Therefore
the power supplies have two
rugged mains transformers

and 120.000 microfarads of
storage capacity to ensure
rigidity. This makes the
power amplifier able to
drive loads even below

2 ohm.

16 MOSFET power
transistors, 8 MOSFETS per
channel, each MOSFET
rated to 8 Ampere
continuous currentt
Combined with a large,
efficient power supply this
make the amplifier able to

deliver superior current
capability, approaching the
100 Ampere barrier.

The output devices require
no protection and are
therefore able to draw all

current required from the
rigid power supply

These advanced features
also make the TPA 3016A
an ideal choice for
professional applications.

This takes full advantage of
the MOSFET speed and
inherent current sharing.
The feedforward circuit
eliminates the ON-resistance
in the MOSFET's

completely. This results in
very low output impedance
at even several hundred kHz
assuring full control over all
elements In the speakers.

This results in highly detailed
and accurate mrdrange and
high end unmatched by any
other design.

No negative feedback would
have caused DC stability
problems without special
servo systems, Usually this

is done electronically with a
lowpass filter and negative

feedback, which affects the
sounds Controlling by means

of circuit elements
temperature coefficients
have no negative effects and
solvesthe problem perfectly.