Revox A76 Service Manual

5.
5
.
Distortion
Test
equipment:
Signal
generator,
frequency
94
MHz
2
mV
o.c.v.,
modulated
with
stereo
modulator, 40
kHz
deviation,
modulating
fre-
quency
1 kHz
(
L
=
R
),
pilot
frequency 9
%
(
6.75
kHz
deviation).
Distortion
analyzer.
5.5.1.
Tuner:
Power switch
depressed,
adjust
output
frequency
on
signal
generator
to
obtain
zero
readingonCENTRE
TUNING
meter
(44)
(approx.
94
MHz)
5
.
5
.
2
.
Calibrate
distortion
analyzer
to
obtain
a
reference
reading.
5. 5. 3
.
Measure
distortion
product.
In
the
mono-mode
(
button
STEREO
AUTOMATIC
(47)
re-
leased
)
total
harmonic
distortion
must
not
exceed
0.2 %.
5.6.
Signal to
noise
ratio
Test
equipment:
Signal
generator,
frequency
94
MHz,
2
mV
o.c.v.
modulated
with
stereo
modulator, 75
kHz
deviation,
modulating
fre-
quency
1
kHz, no
pilot
frequency.
Distortion
analyzer
(or audio
mlllivoltmeter).
5.6.1.
Tuner:
Power
switch
depressed.
Adjust
frequency
on
generator
to
obtain
zero
indication
on
CENTRE
TUNING
meter
(44)
(approx.
94
MHz).
5.6.2.
Calibrate
distortion
analyzer
( or
mlllivoltmeter)
to
obtain
a
reference
reading.
5.6.3.
Turn
off
modulation,
read
signal
to noise
ratio
(
>
70
dB).
5.7.
Stereo
separation
(crosstalk)
Test
equipment:
Signal
generator,
frequency 94
MHz,
2
mV
o.c.v.
modulated
with
stereo
modulator,
40
kHz
deviation,
modulating
fre-
quency
1
kHz
(L
=
R)
pilot
signal
9
%
(6.75
kHz
deviation).
Distortion
analyzer
(or
audio
mlllivoltmeter).
5.7.1.
Tuner:
Power
switch
depressed,
adjust
frequency
on
generator
to
obtain
zero
indication
on
CENTRE
TUNING
meter
(44)
(approx.
94
MHz).
5.7.2.
Calibrate
distortion
analyzer
(
or millivoltmeter
)
to
obtain
a
reference
reading.
5.7.3.
Turn
off
modulation
of left
channel
(
or
right
channel
respectively
),
take
reading
of signal
crosstalk
from
other
channel.
The
crosstalk
figure must be
not less
than
40
dB.

Revox A76 Specifications

General

Brand	Revox
Model	A76
Category	Tuner
Language	English