AVM EVOLUTION A2 Manuel d'utilisation - Page 3

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AVM EVOLUTION A2 Manuel d'utilisation
There is not one single capacitor to be found in the entire high-level signal path of the A2.AII stages are dc-
voltage coupled. Phase shifts in the audible range are excluded.
THE OUTPUT STAGE
The output stage circuitry described here uses two mirror-image differential stages at the front end. Their
working points are stabilized through electrical sources with extremely high internal resistance. The subse-
quent .current mirrors are responsible for super fast reaction times.
OPERATION OF THE EVOLUTION A2
An initial request: Please follow the sequence given in this manual when taking your A2 into use for the first
time. By doing this you will learn all the capabilities of your integrated amplifier and prevent inconvenience
due to faulty operation.
In the text you will find numbers behind the descriptions of the individual operating elements. These relate
to the following diagrams.
This enabled us to integrate a ground plane in the circuitry board lay-out without having to accept loss of
speed.The ground plane de-couples the individual amplifier stages by absorbing their scatter fields. This com-
pletely excludes any unwanted sympathetic influence and resulting parasitic oscillations. This is further supp-
ported by stabilizing the operating voltage with film capacitors at strategically important points. The idling
current stabilization of cold amplifiers is achieved through circuitry that doubles the idling current in the
warm up phase (lasting about 5 minutes) subsequently reducing to its normal value. This considerably shor-
tens the warm up phase when compared to other concepts.
The output transistors are field effect transistors (FET) with delivery of current capability totaling over 90
Ampere.AII FET are selected with a tolerance of
+/-
5mV to provide optimal current distribution.
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6.
DISPLAY
7.
Toggle switch LEVEL
8.
Toggle switch BALANCE
9.
Multifunction operating element VOLUME/BALANCE
10.
Headphone jack
The signal passage over the epoxy resin circuit board is via
70~
copper conducting paths. The minimized sig-
nal paths between the circuit board and sockets, through optimized layout, enables the extreme coefficient
of damping necessary for control of loudspeaker and room acoustics.
The damping factor of a poweramp regulates the tone of a loudspeaker not just by damping self resonance.
Just as important is the ability to absorb the acoustic energy reflected from the room. This is because loud-
speakers, in reversal of their primary working role, are also microphones. The acoustic energy emanating
from room resonance can be damped by absorption through the amplifier. Laboratory tests have shown that
the EVOLUTION A2 is extremely capable of reducing room resonance as a result of its high damping coeff-
ficient.The bass reproduction remains extremely controlled and dry even in the deepest bass tones.
Your amplifier and connected loudspeakers are safeguarded by protective circuitry against overheating, short
circuit, DC and extreme ultrasonic frequencies.
All important components operate within broad safety margins. The electronics have been designed to pro-
vide absolute operational safety.This, and the incorporation of highest quality mechanical parts, together with
the two year guarantee will give you the assurance of enduring, trouble-free musical enjoyment with your
integrated ampiifier.
20
I.
On/Off switch
2.
Operation control LED
3.
Selector switch PROGRAM
4.
Toggle switch MONITOR
5.
Toggle switch PROCESSOR
II
I I. Connecting clips - right loudspeaker
12. Input DISC I or PHONO
13. Ground clip for record player GROUND
14. Input DISC2
IS. Input TUNER
16. Input AUX I (Hi-Level)
17. Input AUX2
23
18. Input TAPE
19. Output REC OUT
20. Output PROC IN
21.
Input PROC OUT
22.
Output PRE OUT
23. Connecting clips - left loudspeaker
24. Power supply connection (cold unit socket)
24
21