Akai M-9 User manual

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OPERATOR'S
MANU AL
CROSS -F IELD HEAD
FOUR TRACK STEREOPHONie
TAPE .RECORDER

AKAI M-9 · M-9DX
TABLE OF CONTENTS
' ' •,
I GENERAL INFORMATION
1. Specifications ············..················ 2
2. Controls ······································· 3
3. Cro ss field Head ························ 5
4. Recor
ding / Pla y ba ck
for 4
tr ac k ········· 6
5.
Operationa1 Prec aut ion s ··..··········· 7
6.
Voltage and Cycle Con version······ 8
7. Selection oC Tape Speeds ·· ·· ······ ·· g
8. Pla y back using External Speakers··· 10
9. DI N ( One Multiple Connection)
J
ac k ········· 10
10. Tape Cl ea ner ························ ······ Il
J[ OPERATING INSTRUCTIONS
1. Thrc:1ding the Tape··· ·················· 12
2. Stereo Pla yb ac k ············ ··· ············ 12
3. Au toma tic Stop /.3hut· Üff ····· ······. 13
4. I nstant Stop Control ··· ············ ·· · 13
5. Ster eo Recordin g ························ 14
6. R
ecor din g from Ster eo Broadcast··· 15
7. Recor din g li · om Stereo Dises········· 15
8.
Mona ur al Rcco rdin g on
Tr acks No. 1- 4 ····· ···· 15
9.
Monaura1 Rec ording on
Track s No. 3 2 · ········ 16
10. Monaura1 Pl aybac k ··· ····· ······· ······ 17
Il. Tape Erasing ······························ 17
12. fast Forward and Rew ind ············ 18
13.
Monitoring ··..····························· 18
1
4. Tape Splicing and Editing ············ 18
15. Cleaning Head ............ ·············.. 19
16 . Head D emagnet i za ti on ...... ......... 21
17 . T ape Dupli ca tion ............ ............ 21
18 . Sound on So und ························ 22
19 . Transistor Pro tccti o:1 ·················· 23
JI[ ACCESSORIES
1. Accessori es Optiona 1· ···· ······· ········· 24
2. Accessori es Standa rd ······ · ········· ····· 25
lV SCHEMATIC

1. SPECIFICATIONS
Tape Speed
Wow
and Flutter
( Playback Only )
Frequency Response
Distortion
Signal to Noise Ratio
Input Leve!
Power Output
Equalization
Recording Leve! lndicator
Recording System
Fast Forward and Rewind Time
Recording Capacity
Maximum Reel Size
Head
Mo tor
Speaker
Transistor
Power Supply
Power Consumption
Dimensions
Weight
I GENERAL INFORMATION AKAI M·9 · M·9DX
1-7 / 8, 3-3/ 4 and 7 -1 / 2 ips (15 ip s with 15 ips adap t or kit)
Less
than 0.15% RMS at 7 -l / 2ips
Less than 0.25% RMS at 3-3/ 4 ips
Less
than 0.35% RM S at 1-7 /8 ips
30 to 23,000cps
±3db at 7-l/ 2 ip s
30 to 18,000
ep s ± 3 db at 3-3/ 4 ips
30
to 9,000 eps ±3 db at 1 -7 / 8 ip s
Within 2% 1,000 eps 0 VU
Be tt er th an 50 db
Mie .··.. ..... ... ........ more th an 0.5 rn V
Line
···· ·········· -···· mo re th an 60 mV
15 W maximum per each ch an nel at undistorted power, t ota l 30 W
20 W
maximum per eac h c hannel at mu si c power, tot al 40 vV
Correct equalization for playback of tape s recorded to th e NARTB cu rve.
VU met er x 2
4-track stereo/
inonau ra l, CROSS-FIELD bias system
90 seco
nd s using 1,200 feet t ape at 50 cycles.
75 seconds at 60 cycles.
8
hour s monaur al recording at 1 -7 / 8 ips ( 1, 200 feet tape)
4
hour s stereo rec or di ng at 1- 7/ 8 ips.
7" reel
Recording/
playb ack h ea d· · 4-track stereo/ mo naur al, im pedance 1. 2 K ohm s at 1,000 eps
Bias h
ead ························ ·· 4-track stereo, low i mpedance 50 0 ohms at 60 KC
Erase he ad ·· ···· ··· · ····· ······ ····· 4-track stereo, low impe dance 500 ohms at 60 KC
Hysteresis synchronou s 2-speed mo tor
5" high comp li ance speak er x 2 ( M-9 DX )
4" sp
eaker x 2 ( M- 9)
Transistor x 20
Thermi ster x 4
Rectifier x 4
AC 100 to 240 V, 50/ 60 cycles
lOO VA
20" H x l3" W x 9-1 / 2" D (508 H x3 40 W x 2 400 mm )
4 1. 8 lbs (19 kg) ( M-9 )
45
.1 lbs (20 .5 kg) ( M- 9 0X )

AKAI M-9 • M·9DX 2. CONTROLS

CONTROLS
CD Supply Reel Shaft
@ Cycle Conversion Switch (A)
® Cap sta n Storage Post
@ Tape Cie aner
@ Tape Gu i de
® Cleaner Button
(J) Reset Button
® Index Counter
® Track Selector Knob
If; 'ead Caver (A)
,......
@ Head Cov er (B)
@
Equali zer K nob
@ R ec ording Leve! Control
Kriob (Lefr)
@
Mi cr op hon e J ack (Left)
@
Microphon e J ack ( Right )
@
Volume Control Knob (L eft )
@
Treble Control Knob (L ef t)
@ Recording Leve! Control
Knob ( Ri ght )
@ Tr eb le Cont rol Knob ( Ri ght )
® Volume Control Knob
(Right )
@
VU Met er ( Lef t)
@
VU Meter ( Rig ht)
@
Stereo Hea dphone J ac k (A )
@ Stereo He a dphone Jack lB)
@ R eco rdin g Mode Switch
@ Function Switch
@ Bass Switch
@ Power Switch
@ Record Saf ety Bu t ton
@ Automat ic Stop / Shut-Ofl
Swit ch
AKAI M·9 · M·9DX
@ Record / Playb ac k K nob
@ Fast Forward / Re w ind Knob
@ Start Button
@ Insta nt Stop Lev er
@
Automatic S hu t -Off Lever
@
Pinch Wh ee l
@
Capstan
@ Cap s tan Sh aft
@l T a ke-up Reel Shaft
@ Speed Ch a nge Switch
@ S pea k er Re fl ectors
@ DIN J ac k
@
Line Input J ac k (L eft )
@ Line Output J ac k (Left)
@ External Speaker J ac k
(
Le ft)
@ External Speaker J ac k
I
Right )
@
Line Output Jack ( Ri g ht )
@ Line Input Jack (R ig ht )
@
AC Gord
@ Fuse Post
® Cycl e Conv ers ion Switch (B)
® Vo lt age Con versi on Switc h

AKAI M-9 · M-9DX
3.
CROSS-FIELD HEAD
Cross-field head creates a sensation m the tape recorder world by making a wide range of recording which has never been heard
before of any tape recorder.
Using this cross-field head, Mode! M-9 (M-9DX) provides a surpnsmg recording performance (30-23,000 eps at a tape speed of 7-l/2
ips, 30-18,000 eps at 3-3/4 ips and 30 to 9,000 eps at l-7 j8 ips).
What is superior about cross-field recording? How does it differ from typical recording methods as far as construction is concernee! )
On these, explanation is given below in sequences:
ln the typical recording system, the signal current and the bias current are combinee! together and applied to the recording head.
(Refer to Diagram l. )
It is weil known that the purpose of bias current is recording at high sensitivity with a signal applied on the tape, with no distor-
tion
and minimizing noise generation.
However, the bias current providing such an advantage also has an undesirable character. That is, the wide magnetic field of the
bias current affects the recordee! signal, resulting in weakening or even erasing the signal. This phenomenon is particularly notice-
able at high frequencies.
In the cross-field system, the signal current is applied to the recording head while the bias current is applied to the bias head.
These two heads are located in different positions, as determinee! inter-relatively, so the magnetic field of the bias will not affect
the signal recordee! on the tape, even when a sufficient bias is applied. This allows the recordee! signal to remain on the tape with
high fidelity.
Diagram l. Ordinary recording system
Diagram 2. Cross-field recording system
1
~-----•----~---~~

4. RECORDING/PLAYBACK FOR 4- TRACK
AKAI M·9 · M-9DX
The Mode! M-9 (M-9DX ) employs the 4-track system, either stereo or monaural.
----
1
First track
1
~
1
1 \
( }
Second track
Third track
Tape width
Track selection is made by the TRACK SELECTOR
KNOB@ .
\
Fourth track
....
-
(A) Recording/Playback for 4-Track Stereo
For stereophonie recording two of these tracks are used
at a time. Set the TRACK SELECTOR KNOB @
in
"ST" position. The first half of stereophonie re-
cording / playback is made on Tracks No. 1 and 3 and
the second half on Tracks No. 2 and 4 after the tape
reels have been turned over.
(B) Recording/Playback for 4-Track Monaural
Recording / Playback of monaural should be performed m the sequence of 1-4-3-2 (tracks).
(!)
Monaural recording / playback on tracks No. 1-4
Set
the TRACK SELECTOR KNOB ® to "1-4" for recording on track No. 1 first, and then on track No. 4 after the tape
reels have been turned over.
(2)
Monaural recording/playback on tracks No. 3-2
Set the TRACK SELECTOR KNOB ® to "3-2" for recording on track No. 3 first, and then on track No. 2 after the tape
reels have been turned over.
CD @ ® ®
Recording head
1 ~4 ~1~4~
2 3 2 3 :.~====----==------~
------~--------------- --------------------
3 ____________________ _
4 ____________________ ___
Tape transport . ~;rection
',......-

AKAI M-9 · M-9DX
5. OPERATIONAL PRECAUTIONS
IMPORTANT: READ THE FOLLOWI:'-JG INSTRUCTIONS CAREFULLY BEFORE OPERA TING YOUR MACHI NE:
CD THE USE OF A NEW TAPE WI LL RESULT IN THE BEST RECORDINGS.
® THE SYMP TOM S LISTED BEL OW DO NOT NECESSARILY INDICATE MECHANICAL FAILURE OF YO UR TAPE
RECORDER. IF YOUR MA CHINE EXHIBITS ANY OF THESE SYMPTOMS, CHECK FOR THE TROUBLE AS
IN DICATED.
(1) Loss of sensitivity and tone quality may be due to:
A. Dirty era~e head. Thi s will prevent prerecorded material from being completely erased.
B. Du st on the reco-ding head. C!ean the head gently with a soft cotton swab soaked in rubbing alcohol or ca rbon
tetr achloride.
C. A.C.
power voltage low er thaa the standard voltage to which your machin e is adjusted.
(2) Irr eg ularity in the tape transp ort may be due to ·
A.
Grime adher ing to the heacls.
B. Oil on the capstan.
C. Sticky or dirty tape surfdce.
D. Bent
take-up reei.
(3) If vour machin e will not record. check the following for correct position.
A. Recorci/
Playback knob.
B. Input plugs.
Note:
(1) Before operatin g your machin e. be Sclt·e to clean the surface of the head.
(2) Unused tape m ay become soft and sticky. It is advisable to run the tape onc e from the supply reel to the take-up reel
before
threading it fJr recordin g.
@ THE FOLLOWI:\/G NOTES ARE PROVIDED FOR YOUR CONVENIENCE.
(A) If any trouble clevelops. pka se take your machine to the nearest authorized agent in your area or inquire at the Service
Dept. of th e Akai Company in Tokyo, Japan.
(B) Your Akai T ape Recorder M ode ! M-9 !M-9DX) requires the constant voltage for optimum performance.
(C) The standard 1,200 feet length of tape on a 7" reel plays up to 32 minutes at 7- 1; 2 ips speed in one direction.
(D) If the sound sources are so far away f•·om the microphones that the volume control must be turned up to a maximum.
sorne hum or noise will inevitably be recordee!. In such inst ance, a test recorcling is recommended before attempting a
final recording.

6. VOLTAGE AND CYCLE CONVERSION
POWER VOL T AG E ADJUST ME NT
The Mode! M-9 (M-9DX) is operatable anywhere in the world. With the
built-in stepdown power transformer, the user can easily readjust the recorder
to any one of the six stages of power voltage from 100 to 240 volts A.C.
Generally,
the recorder's input voltage is preset for the forwarding territory.
The user is requested to check the previously set voltage before operation.
This can be seen at the rear of the recorder.
If another voltage is required, readjusting of the voltage can be made in ac-
cordance with the following instructions.
(1 ) Take off the ventilator panel by removing four mounting screws as shown
in Fig.
A. Then, pull out the VOLTAGE CONVERSION SWITCH @>
gently and reset the knob so that the desired voltage will appear on the
ventilator panel. (S ee Fig. B)
(2)
The voltage conversion switch is a plug-in type movable in six steps, 100 /
110 / 120 /200/220/240. For example, if the power voltag e distributed in
your area is 220 volts A.C., reset the switch to 220 mark.
(3) Change fuse according tu voltage.
Fuse: IOOV~l20V 21\, 200V~240V 1A
CAUTION: Disconnect the power plug from the AC outlet before readjust-
ing power voltage. To mai ntain optimum performance and to prolong the
!ife of your machin e, it is important that the line voltage be held within 10
percent deviations from the standard voltage.
POWER CYCLE CHANGE
Correct tape speed is not obtainable if the CYCLE CONVERSION
SWITCHES are not properly adjusted. The CYCLE CONVERSION
SWITCH (A) ® is located at th e center of the deck top panel and the
CYCLE CONVERSION SWITCH (B) ® at the r ear of th e recorder. Us-
ing a screw
driver, rotat e the CYCLE CONVERSION SWITCH (A) ®
counter clockwise approximately one-ei ghth of a turn. The switch can then
be moved e ither OUT or IN. 50 cycle operation is obtained by moving
th e s witch OUT (Fig. C), and 60 cycle operation, by the switch IN (F ig. D).
Th e switch ® should be rotated back to its original positi on after it has
be
en mov ed either OUT or IN. The CYCLE CONVERSION SWITCH
Œ) ® should also · be reset.
CAUTION : Do not att e mpt to rotate the CYCLE CONVERSION
SWITCHES when the motor is not running .
AKAI M-9 · M-9DX
IN
r
©MOUT 50 .Cio
1

AKAI M-9 · M-9DX
Tape Speed
1
Inches per Second
1-7/8
3-3/4
7-1/2
15
7. SELECTION OF TAPE SPEEDS
Position of Speed
1
1
Caps tan
RECORDING TIME
Change Switch
1
1
4-Track Stereo
Slow
0
0
Fast
1
Y es
1
No
0
-- -- - 0
0 0 i
0 @ 1
The M-9 (M-9DXJ operates on 4 tape speeds, 15, 7-1/2,
3-3/4 and 1-7/8 ips.
Refer to the chart above for selecting an adequate tape
speed. Tape speed is determined by the motor speed and
by the capstan on the tape drive capstan shaft.
Tape 1 Tape Speed
Length __ _ ,_- -,-- -
--- ~ ~ 3-3/4 1 ~
::f~ l += += i ~
4-Track Mono
1200 1 8 1" 4 1
• 2
- --·-1--
1800 12 .1· 6 . 3
24oü - .- 1-6- 8_ 1_ 4_
1-7/8 ips. This tape speed is obtained by setting the SPEED CHA!\ GE SWITCH @ in "SLOW"
position. The capstan is not used but is left on the storage post.
3-3/ 4 ips.
This tape speed is obtained by setting the SPEED CHANGE SWITCH @ also in "SLOW"
position. The capstan is mounted on the capstan shaft and is locked automatically in posi-
tion by
the notches.
7-l/2ips. This tape speed is obtained by setting the SPEED CHANGE SWITCH@ in "FAST"
15 ips. position.
The capstan is used.
This tape speed is provided for convenience. The SPEED CHANGE SWITH @ is set
at "FAST" and use of an accessory 15 ips. caps tan ts required, which is indicated in the
chart by the double circle. Also replace the pinch wheel with the smaller one.

8. PLAYBACK USING EXTERNAL SPEAKERS
Though your M-9 ( M-9 DX ) has two internai speakers, a pair of high
fidelity external speakers will enable you to enjoy the best sound re-
production.
( A) Set the RECORDI:"G ;vrODE SWITCH @ to "NORM".
Œ) Insert the plugs from the external speakers into the LEFT and
RIGHT EXTERNAL SPEAKER JACKS (@ and @). The ex-
ternal speakers shoulcl be separatecl by at !east seven feet.
When the speaker plugs are in the speaker jacks, the respective
internai speakers are inoperative.
9. DIN (ONE MULTIPLE-CONNECTION) JACK
AKAI M-9 · M-9DX
The DIN JACK @ is providecl on the left side of the M-9 (M-9DX) for interconnecting the recorder with an external stereo amplifier
that has the same connection jack. This system will permit easy recording and playback of stereophonie programs through an
external stereo amplifier as the complexity of connecting or disconnecting more than 4 separa te plugs from the recorcler's panel side
is not needed.
If your amplifier is not equipped with the DIN jack. DIN plug: four separa te RCJ\ plugs corel ( AKAI DR-! 10) is usable.
J'CS
GROUND (common to both channels)
~
'; mPREAMP OUTPUT O•R <h•. nnel-recorder)
.
PREAMP OUTPUT (right channel-recorder)
4 5 GROUND (same as number 8 above)
2 REC
INPUT (right channel-ext. amp)
REC INPUT (left channel-ext. amp)
------Front View of DIN .Jack

AKAI M-9 · M-9DX
10. TAPE CLEANER
A squeaking noise may annay the operator while recording or playback.
This may be caused either by a poor tape or by ambient conditions of tempera-
ture and bumidity. When a foreign material adheres to the recording tape,
this material piles up at the recording head, affecting volume or quality of
sound.
The l\1-9 (M-9DX) is provided with a T.\PE CLEANER @, a felt pad properl y
soaked in silicon oil to eliminate noise. When wishing to dean the tape,
CLEANER BUTTON@ should be depressed. When not needed, the TAPE
CLEANER@ should be turned clockwise and locked. When the felt pad is
contaminated and it does not work weil for cleaning of the tape, loosen
the upper screw and turn the felt pad to the unused side. When bath
surfaces of the pad are contaminated, the p2cl shoulcl be replacee! with a
new one. Upon replacing. one or two drops of silicon ail ( included) should
be placee! on the felt for absorption.
Note: \,Yhen an excessive amount of silicon oil is appliecl, the tape surface
may become discolored and sticky.

ll OPERATING INSTRUCTIONS AKAI M-9 · M-9DX
1. THREADING THE TAPE
Place your recording tape on the SUPPL Y REEL SHAFT <D and the empty
reel on the TJ\KE-UP REEL SHAFT @.
Thread the tape as illustrated by the dotted line.
To keep the reels from falling clown, Jock the ree ls with the retainers pro-
' id ed on the top of the REEL SHAFTS.
l:V!PORTANT:
If a utomatic shut-off and automatic stop ar e r equir ed, thread the tape
through the J\UTOMATIC SHCT-OFF LEVER@ . If not, pass the tape
directly onto the take-up ree l.
2. STEREO PLAYBACK
Connect the record er to AC power so urce using the attached AC CORD.
(A) Set th e POWER SWITCH @ to "POWER".
(Il ) Set th e TRACK SELECTOR KNOB ® w "S T".
(C ) Select the tap e speed.
(D) Set the
EQUALIZER Kl\'013 @ to 7-1 / 2, 3-3/ 4 or 1-7
1
8, whi chev er is
consistent
with tape speed.
(E) Set the FUNCTION S\VITCH @ to "STEREO" .
(F; Set the
RECORDING MODE SWITCH @ to "NOR!\!''.
Setting to " MUTE '', you will not hear a ny sound using internai speakers
and exte rnal speakers.
Now,
put your pre-recorded tape on the record er.
(G) After
the above op era tion, set the RECORD / PLA YBACK KNOB @
ro "PLAY".

AKAI M-9 · M·9DX
STEREO PLAYBACK
(H) Adjust the LEFT and RIGHT VOLUME CONTROL KNOBS (@ and
@) to desired volume.
(I) Also adjust to desired tone by using the TREBLE CONTROL KNOBS
(@ and @J), and the BASS SWITCH @J.
1f you would like to stress treble sound. tu rn the knobs (@ and @)
clockwise, and if bass sound, set the switch ® to "BASS".
3. AUTO MA TIC STOP/ AUTOMATIC SHUT-OFF
One of the exclusive features of the M-9 (M-9 DX) is the automatic shut-off
function of the units. \Vhenever the tape com~s to the end, or is damaged
by accident, the AUTOMATIC SHUT-OFF LEVER @ drops clown. Sett -
ing
the AUTOMATIC STOP
1
SHUT-OFF SWITCH @ to "STOP". only
the motion of the tapes stops, and if to "SHUT-OfF", ali the functions of
both deck and 2-mplifier are automatically eut off.
In these cases, just when the AUTOMATIC SHUT-Off LEVER @ drops
clown, PI;\ICH WHEEL@ releases from the CAPSTAN @ automatically
in order to prevent deformation of its soft rubber surface. This function
is AUTOMATIC PINCH WHEEL RELEASE.
4. INSTANT STOP CONTROL
To stop the tape momentarily on recording or playback, push tbe INSTANT
STOP LEVER 1§1 as shown in the Figure. The lever will be lockeci in
the stop position, and it can be released by pushing the START BUTT0:'-1
@). The INSTANT STOP LEVER 1§1 will not function wh en the recorder
is in either fast forward or rewind operation.
An optimum recording leve! can be determined before starting the recorcling
by using the INSTANT STOP LEVER 1§1 after the recorder is set in a
normal recording mode of operation. Adjust the volume control while W3-
tching the VU METERS (@ and @).

5. STEREO RECORDING
@ Set the POWER SWITCH@ to "POWER".
@ Set the TRACK SELECTOR KNOB ® to " ST".
© Select the tape speed as desired.
@ Set the EQUALIZER KNOB @ to 7-1/2, 3-3/4 or 1-7/8, whichever ts
consistent with tape speed.
® Set the FUNCTION SWITCH @ to "STEREO".
® Set the RECORDING MODE SWITCH @ to "MUTE " or "NORM".
© Push the RESET BUTTON (]) and set the INDEX COUNTER @ to
''0000".
This counter provides reference numbers for locating specifie
points
of the recordings on the tape.
Insert the MICROPHONE PLUGS into the MICROPHONE JACKS (@ and
@).
Keep the two microphon es at )east 7 feet apa rt. Place the recording tape on
the re ~ order and pu sh the 1:\'STANT STOP LEVER @) upward until it
locks.
Then, turn the RECORD I PLAYBACK K:'-JOB ® into '·REC." posi-
tion
"hile depressing the RECORD SAFETY BUTTON @.
Microphone volume leve! may be adjusted and balanc ed by the RECORD-
1:'-JG LEVEL CONTROL KNOBS (@ and @J. Norm al recording should
not exceed the black zone on VU METERS (@ and @).
After an optimum recording leve) is deterrnined, push the START BUTTON
@ and release theiNSTANT STOP LEVER@ to start stereo recording.
IMPORTA:\'T:
vVh en you are recording, you can monitor sound either from your stereo
headphone or from the internai speakers ( or th<> external speakers) if set the
RECORDING MODE SWITCH @ to " NORM ". But if set it to"MUTE ",
you
can monitor only by your stereo he adp hone.
AKAI M·9 · M-9DX

AKAI M-9 · M-9DX
6. RECORDING FROM STEREO BROADCAST
Stereophonie broadcast programs may be recordee! from two sets of radio
receivers. This is accomplished by connecting LINE INPUT JACK (LEFT)
@ of Mode! M-9 (M-9DX) to the voice coi! terminais of the left-hand speaker
and UNE INPUT JACK (RIGHT) @ to similar terminais of the right-hand
speaker of the respective radio set. Recording leve! is adjusted by RE-
CORDING LEVEL CONTROL KNOBS (@ and @).
7. RECORDING FROM STEREO DISCS
To record from a stereo dise, a crystal pickup or ceramic pickup can be
connectee! direct to the UNE INPUT JACKS (@ and @). Magnetic car-
tridge output should be connectee! to a separate preamplifier and then to the
UNE INPUT JACKS (@ and @).
8. MONAURAL RECORDING ON TRACKS NO. 1-4
@ Set the POWER SWITCH @ to "POWER".
@ Set the TRACK SELECTOR KNOB ® to "1-4".
© Select the tape speed as desiree!.
© Set the EQUALIZER KNOB @ to 7-1/2, 3-3/4 or 1-7/8, whichever IS
consistent with tape speed.
® Set the FUNCTION SWITCH @ to "MONO".
® Set the RECORDING MODE SWITCH @ to "MUTE" or ·•NORM".
@ Push the RESET I3UTTON (]) and set the INDEX COUNTER @ to
''0000l'.

MONAURAL RECORDING ON TRACKS NO. 1- 4
ln monaural recording; only the left channel amplifier is used. The right
channel amplifier is not required for this operation.
So the microphone plug should be inserted into the MICROPHONE JACK
(LEFT) @.
Place the
recording tape on the recorder.
Push the INSTANT STOP LEVER® upward until it locks, and then turn
the RECORD / PLA YBACK KNOB @ into "REC'' position while depressing
the RECORD SAFETY BUTTON @. Adjust the RECORDING LEVEL
CONTROL KNOB (LEFT) @ to normal recording leve!, while watching
the VU meter indicator of the left channel amplifier. VU meter reading
should not exceed the black zone.
After a correct recording leve! is det e rmin ed, push the START BUTTON
@ to start recording on track No. 1.
At the en d of recording on track No. 1, reverse both tape ree ls for the next
recording on track No. 4.
9. MONAURAL RECORDING ON TRACKS NO.
3-2
Set the TRACK SE L ECTOR KNOB ® to "3-2". For the rest of operation,
just follow the instructions given for tracks No. 1-4 recording. Recording is
made first on track No. 3, then on track No. 2 with both reels reversed.
To record from a dise player or an external amplifier monaurally, use the
LI NE INPUT JA CK (LEFT) @. A crystal pickup can be connected directly
to the LINE IN PUT JACK (LEFT) @. When recording from an external
amplifier, connect to the UNE I NPUT JACK ( LEFT ) @ from the TAPE
OUTPUT of an external amplifier.
To record from a radio, connect radio cable to the radio speaker or . to the
earphone jack. The cable plug should be inserted into LINE INPUT JACK
(LEFT ; @.
AKAI M-9 · M-9DX

AKAI M·9 · M·9DX 1
O. MONAURAL PLAYBACK
@ Set the POWER SWITCH @J to "POWER".
@ Set the TRACK SELECTOR KNOB ® to "l-4"'.
© Select the tape speed as desired.
© Set the EQUALIZER KNOB @ to 7-l/ 2, 3-3/ 4 or l-7/8, whichever IS
consistent with tape speed.
® Set the FUNCTION SWITCH @J to "M0:\10".
Place the pre-recorded tape on the tape recorder.
On monaural playback, only the left channel amplifier should be used.
® Set the RECORDING MODE SWITCH @ to "NORM".
@ Set the RECORD/PLAYBACK KNOB @ to "PLAY".
@ Adjust volume by the VOLUME CONTROL KNOB (LEFT) @ and
tone by the TREBLE CONTROL KNOB (LEFT) @ and the BASS
SWITCH @.
After completing monaural playback on track No. l and No. 4, set the
TRACK SELECTOR KNOB ® to "3-2" for starting now with track
No. 3, then tra ck No. 2.
11 . TAPE ERASING
Any signal information previously recorded on a tape will be erased auto-
matically as a new recording is made on the same tape. Thread th e tape,
and place in normal record position. There should be no plugs connected
to recorder 's input jacks. The RECORDING LEVEL CONTROL KNOBS
(@ and @) should be held in "0" position. A BULK TAPE ERASER is
recommended for quick and complete erasure.

12. FAST FORWARD AND REWIND
Fast forward or rewind is accomplished by turning the FAST FOR WARD/
REWIND KNOB @ into the proper position. When the tape has been
completely wound up or eut, The Automatic Shut-off Lever @ drops clown
and then the FAST FORWARD/REWIND KNOB @ is automatically re-
turned and motion of the tape stops.
13. MONITORING
Monitoring is made by connecting the stereo headphone to the STEREO
HEADPHONE JACKS @ or @.
On monaural as weil as stereo recording, please use the stereo headphone.
Caution: The stereo head phone shou ld be of a low impedance type (8 ohms).
If you record setting the RECORDING MODE SWITCH @ to "NORM",
you can monitor from the interna! (or external) speakers, too.
14. TAPE SPLICING AND EDITING
J>uperimpose the tapes and eut them diagon ally as illustrated. (This
diagonal cutting eliminates the "click" or "pop" sound of the splice.)
Register the eut ends and apply a splicing tape on the glossy side of
the record tape.
Press
the splice tap e with fingers firmly to secure the ends evenly. Trim
off excess splicing tape. Preferably, eut the recording tape slightly
along its edge as illustrated by the dotted !ines. This eliminates the
possibility of a sticky splice. Ta pe splicing using scissors requires
skillful work. The ~cissors sho uld
not be magnetized. But, our spe•
cially desi
gned portable splicer can
do the job with ease.
AKAI M-9 · M-9DX

AKAI M-9 · M-9DX 15. CLEANING HEAD
TAPE OXIDE DEPOSITS ARE 90% OF THE CAUSES OF YOUR TAPE RECORDING FAILURES.
It is imperative for qua!ity performance of a tape recorder to keep th e heads neat and dean at al! times.
Dust and magnetic particles from the tape tend to deposit on th e head s after prolonged use of the tape recorder . This wou!d result
in
poor head-ta-tape contact, deteriorating the sound quality and sensitivity.
Such dust would cause a significant drop in rec ording, playback and erase quality levels.
EXAMPLE