Akai M-7 - Page 2

MODEL NUMBER:
WEIGHT (NET
IN CARTON):
DIMENSIONS
POWER
REQUIREMENTS :
POWER ~~
CONSUMPTION :
RECORDING
SYSTEM :
PLAYBACK
SYSTEM :
TAPE SPEED
TAPE SPEED
DEVIATION :
WOW AND
FLUTTER
FAST FORWARD
AND. REWIND
TIME:
FREQUENCY
RESPONSE :
DISTORTION
SIGNAL-TO- .
NOISE RATIO :
CROSS TALK
CHANNEL
SEPARATION :
POWER INPUT
LEVELS :
_
.
SPECIFICATIONS
Akai Model M-7, portable 4-track
stereo tape recorder.
47.3 lbs.
2.4 Ibs.
supplied.
(21.5 kg.) for M-7
(1.1 kg.) for all accessories
20°H x13’W x9’D, overall, case clo-_
sed. (S10OHx340W x226D in m/m)
A.C. 100, 110, 117, 200, 220, 230
or 245 volts interchangeable. 50-60
cycles,
100 VA.
Specific “cross-field” recording based
on the theory of trailless recording
bias system. Inline 4 track stereo
and 4-track’ monaural recording.
Inline 4-track stereo, monaural and
2-track stereo playback. Playback
of monaural double-track and full-
track recordings also possible.
: Three speeds; 74%” (19cm,), 3-34”
(9.5cm.) and 1-4” (4.75cm.) per
second.
Less than +3 per cent at all tape
speeds,
Less than 0.15% R.M.S. at 7-34 ips.
Less than 0.25% R.MSS. at 3-% ips.
Less than 0.35% R.M.S. at 1-% ips.
90 seconds for 1,200 ft. tape at 50
cycles and 75 seconds at 60 cycles.
40 to 23,000 cps. at 7-14 ips +3 db;
40 to 20,000 cps. at 3-% ips +3 db;
4O to 10,000 cps. at 1-% ips +4 db.
: Within 3 per cent T.H.D. at all
speeds. :
40 db below . recorded level signal .
at all speeds.
: Within 53 db between each track.
Better than 60 db at 1,000 CPS 3 VU.
Microphone input level
POWER ©
OUTPUT |
X
INSULATION
RESISTANCE :
_INSULATION
YIELD
STRENGTH :
MONITORING
SYSTEM
MOTOR
HEADS
MICROPHONE
USED
SELF-CONTAINED
SPEAKER :
TUBES USED
REELS USED
RECORDING
LEVEL
INDICATOR :
: Hysteresis synchronous,
-55
db
(VR.
max)
at
1,000
cps.
Phono
and
radio
input
level
-15
db
(VR.
max)
at
1,000
eps.
:
Head
output,
1
mv.
at
1,000
cps.
-.
Pre-Amplifier
output,
0.8
V
at
1,000
cps, impedance 10,000 ohms
Main output, 34 dbm, up
{in 600 ohms).
More than 10 MEG ohms
More than one minute at A.C.
1,000 V with Headphone
(8 ohms) during recording.
two-speed.
motor. Capacitor start.
1/100
HP.
Power
ratio,
70
per
cent.
3,000
to
1,500
rpm
at
50
cps,
3,600 to 1,800 rpm at 60 cps.
:
Inline
four-track
stereo/monaural
re-
cord-play head;
Impedance:-:-:5,000
ohms
at
1,000
cps.
Four-track,
cross-field
bias
head
;
Impedance---14,000
ohms
at
60
ke.
Four-track
erase
head
;
Impedance:--18,000
ohms
at
60
kc.
Square-shaped,
dynamic
microphol..
Impedance::-50,000
ohms
Sensitivity:--55
db.
Frequency
Response:--70
to
15,000
cps
+
10
db.
5x7” (12x18 cm.,), oval-shaped,
dynamic speaker ;
Impedance-:-8 ohms
Allowable Input-:-6 watts
Frequency Response---80 to
12,000 cps, + 10 db.
6267 (EF86) x 2, (12AD7) x 2,
‘6BQ5 x 2, 6X4 x 2, 6ARS x 1.
Up to 7” reel
Horizontal, A-model VU meter