Sentec pa 9 brochure

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SENTEC AB, a Swedish audio laboratory established in the
late 19603, have refined simple and straight-forward
circuitry to state-of-the-art sonic quality in the No. 9
Power Amplifier.

The SENTEC PA9 is a monaural power-amplifier that sets
new overall standards for medium-power class AB musical
performance.

The aim for the development of the PA9 was to create a
power amplifier without coloration or its own sound,
totaly transparent to any musical signal at the input, and
with the ability to reproduce exellent tonal quality and fragile
details.

PA9

SENTEC MONO POWER AMPLIFIER

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To achieve this superb sonic quality in a cost effective way, we have optimized an innovative all discrete circuit
topology, using high performance quality components, in a carefully designed layout. We also optimized the signal
path and built a very compact and simple, but pleasant looking and practical cabinet to accomodate the delicate
electronics.

In addition, the true mono-block realisation gives also complete electrical independence and choice of placement,
e.g. close to the speakers, for the best possible imageing and shortest possible speaker cords.

The use of long speaker cords, independent of make or price, gives a serious degradation of sound quality,
especially in conjunction with complex impedance modern speaker systems.

The SENTEC PA9 is designed to drive all types of acoustical transducers, irrespective of impedance complexity,
with a nominal impedance of around 4 Ohms or more.

In sophisticated multi amplified speaker systems, the PA9 is also the ideal means of achieving further sonic
refinements in a very cost effective fashion.

The PA9 is a completely complementary
design with a dual differential input stage w
followed by a dual complementary differential
single-ended voltage gain stage operating at 3°
high Current for class-A operation. 753
The output current-amplifier consists of 6 /_,/ / _ / ,z
selected and matched 12 Amp. Darlington mt . _, -'i' ~ » I - . /
devices, to achieve low open-loop output a o» a; saw ' I ,, , '5
impedance and linear high-current capacity. :35: 2;; "T ' f '
This ensures very smoth output transitions 6 7"
with apparently no crossover or switching 13:; i3:
distorsion, even at high-current output 33:; 1:3: ' ° V ° °"
conditions. 6 3" ,
2 Ohm B: 192'
In the power supply a conservatively rated 180 :3. :33: means mo
Watts toroidical transformer feeds a pair of :33: 3::
switching -grade low ESR capacitors of a total -ee -3e 9 .3. .es 2
capacitance of 30.000 UF through a 6 Amp. KAPACITIV FASVINKEL (GRADER) XPOUKHV
full -wave bridge rectifier.

An exellent and well -thought grounding system, which does not inject internal loop-currents or hum in the signal
ground-path, assures high immunity to noise and mains interference.

The SENTEC PA9 is carefully temperature compensated and will give its full performance after an unusually short
warm -up period.

Protection of the amplifier is moderately utilized, by means of over current protection circuitry in combination with
internal fuses, in order not to interfere with any musical transient signals under complex and severe conditions.
Gold-plated heavy duty output terminals will accept 4 mm banana contacts or up to 4 mm speaker cables in
binding posts.

As these design details and impressive specifications cannot describe the exeptional sound quality of the PA9, we
recommend you not only to compare specifications by figures, but also to try and get an opportunity to listen under
relaxed conditions to your favourite music at your SENTEC representative.

SENTEC AB
Rated continous power FTC BOhms 60Watts

40hms lOOWatts

i"imminent2C>hms15€>wmts Po. Box 373, S - 714 03 KOPPARBERG, SWEDEN

Output impedance less than 0.1 Ohms
Slew ~ rate 4 to 8 Ohms more-than 50V/uS TEL: + 46 580 202 30 FAX! + 46 580 202 23
Power bandwith - 3 dB 5H2 t0150 KHz
Phase linearity 20 Hz to 20 KHz max3Deg.
Small signal bandwith - 3 dB 2H2 to ZOOKHz
Distorsion THO 8 Ohms 1 KHz less than 0.03% - - . N
4 to 8 Ohms, 20 Hz to 20 KHz lessthan0,06% D'Str'bmed by. 3
Input sensitivity aproximatelyl Volt 3
Input impedance 12 KOhms lnF/3300hms 5
Signal to noise unweighted 110dB 5
Signal to noise A -weighted lZOdB 3
Voltage gain 26dB "5
Total amount of feedback 36d8 E
Open - loop bandwith -- 3 dB 23KH2 &
Maximum power consumption 200Watts é
Dimensions H 76,W 200. D 300mm 5
Net weight 4Kgs (8.8 lbs) g