Revox A76 Service Manual

39
52 51
46 47
48
49
50
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45
44
43
42
41
40
Fig.
3.1.-1
2.3.3.
Positioning
of
dial
pointer
—
Turn
drive
shaft
(
3 )
ccw
until
it
stops
with
the
tuning
capacitor fully
closed
—
attach
pointer
slider to
steel
wire
—
with front
panel and
dial
installed,
slide
pointer to
the
left hand end
of the
horizontal
line
on the
dial
(5)
.
58
59
57
3.
CIRCUIT
DESCRIPTION
3
.
1
.
Operating
controls
The
index
numbers
on all
operating
controls
are
Identical
to
those
used
in the
Operating
Instructions
(see
fig. 3.
1.-1
).
3.2.
Schematics
The
following
schematics
are
contained
in
section 7
of this
manual:
3.2.1
Functionally
grouped
Block
diagram
One
group
function
corresponds
to one
actual
circuit
board.
3.2.2.
Interconnecting
diagram
showing all
power supply
and signal
connections.
Please
note:
The
circuit
of
the
push-button assembly (
G )
1.076.291
is
shown
on
this
interconnecting
diagram
only.
3.2.3.
Complete
circuit
diagram
with
signal
connections.
On
this
diagram
the
switching
elements
of
the
push-button
assembly
are
shown
as
peripheral
circuit
elements.
3
.
3
.
RF
input
section
(front
end)
1.076.150
(schematic
A)
The
signal
arriving
on the
60
ohms
or 240
ohms
antenna
sockets
is
fed
via a
balancing
transformer (
Baiun
)
to
the
tuned
RF-input
stage
with its
FET Q101.
Coupling
to
the
mixer
Q102
is
achieved
through
the
band-pass
formed by
LI
04/
LI 05.
The
RF
signal
from
the
stabilized
oscillator
Q104
passes
through
the
buffer
stage
Q103
and
reaches
(via
the
oscillator
5

Revox A76 Specifications

General

Brand	Revox
Model	A76
Category	Tuner
Language	English