Tandberg TPA 3006 A Brochure

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Technical Paper

TANDBERG

Amplifiers TIA 3012 - TCA 3002A ATPA 3006A

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AMPLIFIERS

TIA 301 2
INTEGRATED
AMPLIFIER

TCA 3002A
CONTROL
AMPLIFIER

TPA 3006A
POWER
AMPLIFIER

Tandberg's amplilier designs
are state of the art technology
packaged with flexibility 01
control and beautitul Scandi-

navian design. The amplifiers
share a common heritage ol
musical accuracy based on
superior engineering

Their overall design phtlo-
sophy l5 based on

Component
selection

Dielectric
losses

Capacflance
change

1. All audio stages are comp-
rised exclusively at polyester
capacnors and metal film

resistors These components
have been chosen for several
reasons.

a) Commonly used electrolyr
tic capacnors exhibit 5 % or
more dielectric absorption.
This relers to the capacitor's
tendency lo «hang on» to the

signal passing through it and

thus superimocse its characte-

ristics on the lollowrng signal.
This causes a subtle sonic
«blurring» and loss of inner

detail. Polyester capacitors
exhibit 0.01 /17 dielectric
absorption. an improvement
on the order at 500 times.

b) Ceramic capacnors sutter
from an allied problem, They
tend to be voltage sensitive
and Iheir rated capaCItance
changes as the Signal voltage

swmgs through its normal
range The high lrequency
phase shill that results is the
eluswe cause 01 a harsh.
metallic sound character

Again, the solution was to rep
lace the ceramic With hlghly
Stable polyester types.

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Discrete
components

1:) Component selection also
includes all discrete audio cir-
cuitry (no lC's) lor minimum

distorition and optimum signalr
to-nOise All critical stages are

comprised 01 1 % tolerance

deVicesi This insures accurate
perlormarice and unit to unit
consnstehcy.

High current
capability

Dig'tal Disc

HIAA

2. High current amplifier des-
ign with lully regulated power
supply, Both TlA-3012 and
TPA-SOOGA feature toroidal
power lranstormers tor maxi-
mum efficiency and minimum
hum generation The high cur
rent design guarantees super
rior pedormance under all the
most dynamic signal conditi-
ons, no matter what type at
loudspeaker is used.

3. Digital Disc input on TCA
3002A and TIA 3012 otters an
overload rating in excess of 20

4. Passive/Active Phone E0.
Both phono sections, MC/MM
are split into passive H F. and

volts No matter how dynamic
the source it Will not overload
the input,

active L F sections This 9th
minates the need lor negative
leedback in the high end With

its resultant sonic degradation

MOSFET
Output stages

5 Both TIA 3012 and TPA
3006A feature MOSF ET
output stages. These output
devices require no voltage or
current limiting protection cir-
cu its. They are also much las-
ter than commonly used Bi-
Potar transistors and are more
treouency linear when driven
by Tandberg's exclusive con:
stant impedance driver stage.

Negative
feedback

Thermic Servo
Loop

6. Negative leedback must be
properly applied in order to
minimize distortion and not
cause its own sound deteriora
tion In TCA 3002A and TlA
3012 negative feedback is
applied in minimal amounts

7, Both TIA 3012 and TPA
3006A maintain 0 D C volt
potential at the outputs by use

With indiVidual loopsr only to
those amplilier Stages which
require it TPA 3006A has. in
fact. no leedback at all This
revolutionary amplifier main~
tains low distortion by use ol
our Voltage Comparator Cir-

ot a Thermic Servo Loop This

system works Without any can

neclion to the Signal path

cuni This proprietary system
maintains constant tow distorr
tion and stability Without any of
tho detrrmental eliects of
negative feedback

which translates into better,
more natural sound With EDSOV
lute salelv 'or thu loudspeaker.