BETRIEBSANLEITUNG
VOLLVERSTARKER
EVOLUTION
A2
OPERATING
INSTRUCTION
INTEGRATED
AMPLIFIER
EVOLUTION
A2
DEAR
CUSTOMER,
thank
you for
the
trust
you have showninus with
the
purchaseofthis integrated amplifier Evolution A2.You
have acquired a versatile
hi-fi
component
with absolutely excellent
sound
qualities.
It
is
understandable
that
you would liketoimmediately
start
listeningtothe
music. Despite thisweadvise
you
to
show
some
patience; you
will
find
that
this
will
stand youingood
stead.
Before you take this
equipment
into use for
the
first time you should thoroughly read this operating manu-
al.Itwill
ensure
that
the
equipment
can be optimally usedtogive you a
great
dealofuntroubled pleasure.
We
have made every
efforttoincludeinthis manual
all
the
necessary information for providing assistance
to
operate
the
equipment. Please
contactusin
writingorby
telephoneifyou have
further
questions,ifthe
answers are
nottobe found here.Wewill
make every efforttoprovide you with assistance.
YOUR
A
V'A
TEAM
CertificateofConformity
We
confirm
that
the
equipment
describedinthese
operating instructions conformstotheEUregulations
applicable
at
the
timeofprint permitting ittobear
the
sign
CE:
All
relevant
tests
achieved positive results.
18
THE
CONCEPTOFTHE
EVOLUTION
A2
We
have put great
store
during
the
development oftheAYM-high-end
componentstoproduce
interference-
free and precise musical
reproduction.At
the
same
timewewanttooffer you a clear and lucid design which
will
resultinSimple and comfortable
operation.Wehave found
that
conventional solutions are
not
always
adequate
to
achieve
these
aims
without
making compromises.Wehave
not
deviated from
the
norm
just for
the
sakeofit,AYMislookingtoexplicitly serve
the
optimization of tonal quality and
user
friendlinessofour
components.
THE
MECHANICAL
CONSTRUCTION
The
casing of
theA2consists for
the
greater
part
of magnetically shielding steel plate- this dependably
stops
outside
interference.
The
builtinpower
transformers
arebynatureofthe
low scattering toroidal type.
All
in- and
output
sockets of
the
A2 have plated
contact
areas for durability and improved contact. Epoxy resin
circuit boards with double thickness
copper
layer coupled with
the
useofbrand named, selected quality
components
ensure
that
you
will
have long
term
enjoyment
with
your
AYM
integrated amplifier.
THE
POWER
SUPPLY
Two
separate
power
supplies, each with
their
own toroidal
transformers,
supply
theA2output
stages (dual-
mono-construction).
The
filter capacitance totals
over
80.000~F,
the
available
transformer
power
340
YA,
whereby
over
the
short-time, peaksupto
I.OOOYA
are
available.At critical points
the
power
supplyisaddi-
tionally
supportedbyHF-suitable
film
capacitors. Because of this
the
output
stages remain absolutely stable
even
under
loadsof2 Ohms.
The
dual-mono supply ensures optimal channel separation and a stable
tone,
even when powerful musical passages
are
encountered.
The
prestageissupplied from a third
power
supply with 2 x 4.700~Ffilters.This has
the
effect
that
the
input
stages can
operate
without
interference from
the
previously
emitted
amplifier
power
and forms
the
basis for
the
enduring peaceful, well-defined
toneofthe
A2.
THE
INPUT
AMPLIFIER
During
the
developmentofthe
input circuitrywepaid
great
attentiontoextreme
speed, accuracy and low
noise.
The
high
level inputsoftheA2fit
all
signal
sources
with regardtoimpedance and sensitivity.
Additionally input sensitivity can be comfortably adjusted
to
suit
the
requirements.
The inputAUX
I was con-
ceived
asahigh
level
inputtowhich
sources
with exceptionally
high
output
voltage would be
connected.
Relays
are
situated directly behind
the
input sockets.
These
servetoswitch
the
signal, selected with
either
the
rotary
switchorthe
remote
control,tothe
input buffer amplifier.
The
incoming musical
Signalisof low
impedance and
thereby
immunetointerference and cross-talk.
Balance, volume and input sensitivity are adjusted individually
to
the
right and left channelsbydigital
level
con-
trollers.These
workin0.5dB steps withanadjustment accuracyof0.05dB
over
the
complete
range.The result
is
that
the
image remains stable and accurate evenatlow volume.
The
compactness of
the
circuitry allows a
fast and exact processing of
the
musical
Signal,
presenting no
targettohumming and scattering.
19
Thereisnot
one
single
capacitortobe foundinthe
entire
high-level signal pathofthe
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 stagesatthe
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.
OPERATIONOFTHE
EVOLUTION
A2
An initial request: Please follow
the
sequence
giveninthis manual
when
taking
your
A2 into use
for
the
first
time.
By
doing this you will learn
all
the
capabilitiesofyour
integrated amplifier and
prevent
inconvenience
duetofaulty
operation.
In
the
text
you
will
find
numbers
behind
the
descriptionsofthe
individual
operating
elements.
These
relate
to
the
following diagrams.
This enabled us
to
integrateaground
planeinthe
circuitry
board
lay-out
without
havingtoaccept
loss
of
speed.The
ground
plane
de-couples
the
individual amplifier stagesbyabsorbing
their
scatter
fields.This
com-
pletely excludes any
unwanted
sympathetic influence and resulting parasitic oscillations. Thisisfurther
supp-
portedbystabilizing
the
operating
voltage with
film
capacitorsatstrategically
important
points.
The
idling
current
stabilizationofcold amplifiersisachieved
through
circuitry
that
doubles
the
idling
currentinthe
warmupphase (lasting
about
5 minutes) subsequently reducingtoits normal value.This considerably
shor-
tens
the
warm
up phase
when
comparedtoother
concepts.
The
output
transistors
are
field effect
transistors
(FET) with deliveryofcurrent
capability totaling
over
90
Ampere.AII
FET
are
selected
with a
tolerance
of
+/- 5mV
to
provide optimal
current
distribution.
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22
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
boardisvia
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
controlofloudspeaker
and
room
acoustics.
The
damping
factorofa
poweramp
regulates
the
toneofa
loudspeaker
not
justbydamping self resonance.
Just as
importantisthe
abilitytoabsorb
the
acoustic
energy
reflected from
the
room.
Thisisbecause loud-
speakers,inreversaloftheir
primary working role,
are
also
microphones.
The
acoustic
energy
emanating
from
room
resonance
can be
dampedbyabsorption
through
the
amplifier.
Laboratory
tests
have
shown
that
the
EVOLUTION A2isextremely
capableofreducing
room
resonance
as a resultofits high damping coeff-
ficient.The bass
reproduction
remains
extremely
controlled
and
dry
eveninthe
deepest
bass
tones.
Your amplifier and
connected
loudspeakers
are
safeguardedbyprotective
circuitry against overheating,
short
circuit,DCand
extreme
ultrasonic frequencies.
All
important
components
operate
within
broad
safety margins.
The
electronics have been designedtopro-
vide
absolute
operational
safety.This, and
the
incorporationofhighest quality mechanical parts,
together
with
the
two
year
guarantee
will give you
the
assuranceofenduring,
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 IorPHONO
13.
Ground
clip for
record
player
GROUND
14.
Input DISC2
IS. InputTUNER
16.
Input AUX I (Hi-Level)
17.
Input AUX2
23
18.
InputTAPE
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
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