Revox B251 User Manual

2
BASIC
OPERATING
PROCEDURES
2.1 Switching
on
the
8251 amplifier
-
Press POWER ON
button
[1]
or one
of the MONITOR
buttons
([31]
trough
[36])
to switch
the amplifier on.
-
When the
amplifier
is switched on
with POWER ON
[1],
the
last
operating
condition
is automatically
reestablished.
lf one
of the
MONITOR buttons
([31]
trough
[36])
is
pressed,
the se-
lected
source
is connected
through.
-
The speaker
outputs
are only
enable after a brief
delay
in order
to
prevent
damage
to
the speaker
system
from switching
clicks.
2.1.1
Selecting
the audio
sources
(MONITOR
SELECTORS
[31]
trough
[36])
A different
audio
source
can be selected
at any
time after
the
amplifier
has been switched
on. The selection
buttons
[31]
through
[36]
activate
the corresponding
outputs
on the
rear
pa-
nel
of
the amplifier.
TAPE
1
t31l
:
signalfrom
inputTAPE 1
lN
[49]
TUNER
l32l
:
signal
from
input TUNER
[50]
PHONO
[33]
:
signal
from
input PHONO
MM
[56]
or
from
input PHONO
MC
[57]
(option)
if the PHONO
switch
[10]
is in the MC
position
The
required capacitance
of
the cartridge
(refer
to specifica-
tions of the cartridge)
should
be approximately
equalto
the
sum
of the
cable capacitance
and
the switch capacitance.
TAPE
2
t34l
:
signal
from
input TAPE 2 lN
t48l
DISC
[35]
:
signal
from input DISC
[51]
AUX
[36]
:
signal
from
input AUX
[55]
t31l
t32l
t33l
rll
t34l t35l
t36l
IEVOX
r
t_l
rä
fur:
roNf t)crdnor
JA4,
2.1.2
Volume control
R'VOX
Press button
VOLUME
[25].
The display
l2Tlwill
be switched
to
potentiometer
indicaiion.
n
':<
ThespeakeroutpUtSareenabledwithadelayofapproximatelywltruH=ffiF
3 seconds
(speaker
protection).
Two
volumes are
possible
after
-
.i
,; ;
'!'LUi'-
'L:rra.,
raFE?
the amplifier
has been switched
on:
-
lf the
last volume selected
was higher than the
programmed
power-on
volume
(for
programm
ing refer to Section
4.1.1). the
volume is reduced to
the
power-on
volume.
-
lf the amplifier
was
previously
operated below the
power-on
volume. this
lower volume
is
selected.
Adjusting
the volume:
-
The
volume can be
reduced by
pressing
button
[28]
or
in-
creased by
pressing
button
[29].
-
The
volume changes slowly
if
one of the buttons
is
pressed
on
the
side
with
one
arrow
((
or
))
and
quickly
if
pressed
on
the
side
with two arrows
((
or
)).
2.1.3
Channel balance
The channel balance
is adjusted
with
the two buttons
BALANCE
LEFT
[16]
and RIGHT
[14].
The
range of adjustment
is
+3/-10 dB
and
can be varied
in
steps
of 0.5
dB. The sound
pattern
can thus
be accurately
adjusted to
the acoustics of the
room.
Brlef touch-
ing of the buttons
adjusts
the balance
in
one 0.5
dB step,
other-
wise
the
balance
is
automatically
corrected step-by-step
for as
long as the button
is
held.
t14l

Revox B251 Specifications

General

Type	Integrated Amplifier
Frequency Response	20Hz to 20kHz
Weight	12kg
Output	Pre out
Speaker Load Impedance	4Ω - 8Ω
Input Impedance	47kΩ