Revox A77 Service Manual

Dimensions Walnut
Cabinet
Dimensions
Carrying Case
Dimensions Chassis
Color Code :
red
org
yel
gmn
blu
8 78
= red
= orange
= yellow
= green
= blue
— rouge
— orange
— jaune
— vert
— bleu
•
o
00000
I 1\- - -k - -1
o
141
o
00000
© 0 0 0
o
o
0 0
or
o
00000
16
4
vio
brn
gry
blk
wht
1
21
= violet
= brown
= gray
= black
= white
— violet
— brun
— gris
— noir
— blanc
er teck
(OPY• Atm Tapa Som.,
IEC
INPUT
NAB
•
•
Plee•81.
v
Volume
Pleybeck Mot» Smten
STEREO
CH I
CH Il
MONO
SPEAKERS
Off
Ont. A
•
.x ,
L, x..5.1.1oe
RADIO )--- r-dlb
MC
AU%
EAV
•--AwAA—C,
• put Sammor
•
Balance
•
•
Dore Arnoldrec
inme Amoldro
•
Arneller
- ARA • \
w--•Ww—C e
•
General Measurement Conditions :
D.C. Voltages : vertical letters - e.g.)..12v
A.F. Voltages : slant letters - e.g. -. 1k5nri ,
flemme
Volume
Cantor
•
25 r/nV
à cm I
Ramon, Pnom.(0,
• CH II
Pœltke Stem
Buttons * mord /
Record
Volume
Control Il
Record Arnold.,
f- f#
r wcww , * 09111.10 II a w I
SPEAKER I
( RADIO I
OUTPUT I 21V
VAI MIONES
01JTPIJT II LEV
( RADIO II
r Poom MM/dl« -I
„
SPEAKER II
un
VU Il
)8-
Omilletor
I for voltages in rectangular frames
Meter internal resistance 20 kOhm / V min.
Meter: Vac, tube or transistor voltmeter 1 MOhm min.
Record
Reley
Markings on Tantalum Electrolytic Capacitors
Color dot
indicates + and
multiplier
IV
II
Color
(pink**)
Capacitance in MF
Working
voltage
IV
1st digit
I
2nd digit "
Il
multiplier
Ill
black
—
o
x i
io V
brown
1
1
x
10
—
red
2
2
—
—
orange 3
3
—
35 V••
yellow
4
4
—
6 V
green
5
5
—
15 V
blue
6
6
—
20 V
violet
7
7
—
—
gray
8
8
x
0,01
25 V
white
9
9
x
0,1
3 V
• possibly missihg on model B
o• 35 V on model A: pink
Red dot indicates
+ to the right
REVOX A77
DIAGRAMS
TECHNICAL DETAILS
Tape transport :
Tape speeds:
Wow and flutter :
I weighted I
Tape slip :
Tape spool diameter :
Operating position :
Amplifiers :
Frequency response via tape :
Distortion via tape, at 1 kHz
peak level and at 0 VU respectively
Equalization :
Signal to noise ratio, via tape,
weighted as per ASA A
Cross talk at 1 kHz :
Oscillator frequency :
Inputs per channel : Cinch / Jack
5 - pole DI N
Cinch
Outputs per channel : Cinch
5 - pole DI N
Jack
Remote control :
Output amplifiers :
Output power :
I 8 n load 1
Output impedance :
Built - in loudspeakers :
( portable model )
Transistors, etc.
Power supply :
Mains voltages :
Power consumption :
Mains fuses :
Weight :
Measured with REVOX 601 tape
3 — motor deck. Electronically governed capstan- motor.
Electronic speed change .
3 3/4 and 7 1/2 ips. ± . 2 %
max. ± . 08 % at 7 1/2 ips.
max. ± . 1 % at 3 3/4 ips.
less than . 2 %
max. 10.5"
Horizontal or vertical
Equipped with silicon transistors throughout. Plug-in printed
circuit cards
30 Hz — 20 kHz + 2 / — 3 dB
50 Hz — 15 kHz ± 1.5 d6
30 Hz — 16 kHz + 2 / 3 dB }
50 Hz — 10 kHz ± 1.5 dB
7 1/2 ips: max. 2 % or 0.6 % resp.
3 3/4 ips: max. 3 % or 1.0 % reap.
Record : NAB
Playback : NAB and IEC ( switchable
7 1/2 ips: min. 66 dB ( 4 track min. 62 dB)
3 3/4 ips: min. 63 dB ( 4 track min. 59 dB)
at 7 1/2 ips.
at 3 3/4 ips.
Mono better than 60 dB, stereo better than 45 dB
120 kHz, push - pull oscillator
Microphone, switchable LO/HI
LOW: 50 - 600 St . 15 mV
HIGH: up to 100 Id2 2.5 mV
RADIO: 33 ks2 2.5 mV
AUX: 1 Nin 35 mV
OUTPUT max. 2.5 V / Rs 600 SI
RADIO max. 1.2 V / Rs 2.5 kft
PHONES 200 - 600 s2
Fully electric for all operating functions
Plug - in optional
Music power 20 W ( 10 W per channel ) Continuous power 16 W
I 8 W
per channel 1 Distortion better than 1 %
4 — 16 s2
Two loudspeakers per channel ( automatically disconnected when
a plug is inserted into the DIN loudspeaker sockets
54 transistors, 32 diodes, 4 silicon rectifiers,
1 photo resistor, 4 relays
Electronically stabilized
110, 130, 150, 220, 240, 250 V —/ 50 - 60 Hz
Without output amplifiers 70 W
With output amplifiers approx. 70 - 100 W
220 — 250 V— / . 5 A
110 — 150 V—/ 1 A
Approx. 34 lbs.
We reserve the right to make technical alterations in the interests of technical improvements.
10.72
Diag. 1

Revox A77 Specifications

General

Wow and Flutter	0.08% (7 1⁄2 ips)
Frequency Response	30Hz to 20kHz (7 1⁄2 ips)
Signal to Noise Ratio	60dB
Type	Reel-to-Reel Tape Deck
Track System	4-track, 2-channel stereo/monaural
Reel Size	Up to 10.5 inch reel
Motor	2 x reel, 1 x capstan
Inputs	Mic, Line
Outputs	Line
Tape Speed	3 3⁄4 and 7 1⁄2 ips