Maxon AD9Pro User manual

SEFETY PRECAUTIONS
ORGANIC OVERDRIVE
OVERDRIVE SOFT DISTORTION
VINTAGE OVERDRIVE PRO
ANALOG DELAY
OOD9
OSD9
VOP9
ENGLISH
日本語
AD9Pro
Be sure to read these precautions before using this
product in order to insure safe operation of the
equipment.
Keep this User's Guide on hand for future reference
whenever you may need it.
安全上のご注意
機器を安全にご使用いただくため、ご使用前にこの取扱説明書を
必ずお読みください。
そのあとは大切に保管し、必要になったときにお読みください。
OOD9
OSD9
VOP9
AD9Pro

2
●SAFETYPRECAUTIONS● Pleasebesuretoobserve.
Thesafetyprecautionslistedbeloware intendedtoensureyour safety
wheneveryouusetheequipment.
■Precautiontextisgenerallyaccompaniedbythefollowingsymbolsto
alert you and others to the risk of personal and material injury that
maybecausediftheprecautionisignored.
Thissymbolindicatesanitemthatcanresultindeathor
seriouspersonalinjuryifignored.
This symbol indicates an item that can result in serious
personalinjuryormaterialdamageifignored.
■Precaution text is generally accompanied by the following icons to
alertyouandotherstothingsyoushouldorshouldnotdo.
Atriangleindicatessomethingyoushouldbecarefulabout.
Acirclewithalinethroughitindicatessomethingyoushould
notdo.
Ablackcircleindicatessomethingyoumustdo.
Warning
Caution
NEVEROPENTHECASE
・Never try to remove the bottom cover and to modify the equipment.《Internal
components of the equipment use high voltages, and exposing them creates the
dangeroffireandelectricalshock.》
STOPTHEUSEINCASEOFAPROBLEM
・Stopusingthe equipment whenever you notice smoke orastrange odor coming
fromit.
・Contactyouroriginaldealerornearestauthorizedserviceproviderforservice.
Warning

Caution
Warning
3
ENGLISH
BEWAREOFHEATBUILTUP
・NevercoverACadaptorwithclothorotherobjects.
《Builtupheatcreatesthedangeroftheequipmentdeformationandfire.》
USESPECIFIEDACADAPTORONLY
・Be sure to use only the AC adaptor specified in this User's Guide.Use of non-
specifiedACadaptorscreatesthedangeroffireandelectricalshock.
UNPLUGGINGACADAPTOR
・Nevertrytounplug ACadaptorwhileyourhands arewet.Doingso createsthe
dangerofelectricalshock.
・WhenunpluggingACadaptorfromthepowersource,besuretograsptheadaptor.
Never pull on the cord.   Doing so can damage the power cord and create the
dangeroffireandelectricalshock.
LEAVINGTHEEQUIPMENTUNATTENDED
・Wheneverleavingtheequipmentunattendedforlongperiods,besuretounplugAC
adaptorfromthepowersource.Ifnot,thereisadangeroffire.
WATER,HUMIDITY,DUSTANDHIGH
TEMPERATURES
・Never leave or use the equipment in bathrooms, the outdoors or other areas
subjecttowater, high humidity, dust and high temperature. Doing socreatesthe
dangeroffireandelectricalshock.

4
AD9Pro Analog Delay
FEATURES AND CONTROLS
●A pure and crystal-clear analog delay with Maxon BBD IC (MC4107D).AD9Pro features up
to 450mSec delay time with 4 pieces of MC4107D.With the worldʼs first RMS level sensor
and companding noise reduction system, transparent analog delay sound is finally available
in a stompbox format.
●With AD9Pro, typical aliasing and clock noises in analog delay are minimized. Dynamic
range was improved by 18dB and maximum input level by 12dB, compared with AD9. Im-
proved low range response yields bold sound. Excellent balance between low and high
range offers clear and firm delay sound without spoiling warm sound of analog delay.
●Single Head/Dual Head Mode is switchable with newly added tape echo multi-head simula-
tion function. In Dual Head Mode, midstream delay signal (which is taken from the middle of
BBD delay circuit) is added into normal delay signal. This feature provides extensive delay
①IN (input jack)
Input jack to connect to the output of guitar,
other effects or related equipment.The
product automatically turns on when a plug
is inserted into this jack. When not in use,
disconnect plug from input jack to preserve
battery life.
②OUT/DRY OUT (output jacks)
Output jacks to connect to input of amplifier
or other effects. The DRY OUT outputs a
dry signal only.The OUT, when used by it-
self, outputs a mixture of dry and effect sig-
nals and, when used with the DRY OUT
connected as well, it outputs a delayed sig-
nal only.
③DELAY TIME
Controls delay time from 20mSec. to
450mSec.Turn it clockwise for longer delay
time.

④FEEDBACK
Controls the number of repeats from
only one at the minimum setting to in-
finite repeats in the fully clockwise posi-
tion.(The fully clockwise position at a
short delay time setting causes a self-
oscillation, which you can cut off by
simply turn down this volume.).
⑤DELAY LEVEL
Controls the level of delay signal.The
delay level is reduced to zero in the
fully counterclockwise position and is
turned up to match the volume of the
dry signal in the fully clockwise position.
⑥SINGLE/DUAL MODE (multi-head
mode switch)
Switch for single delay/dual delay.In
Dual Mode, midstream delay signal
(which is taken from the middle of BBD
delay circuit) is added into normal delay
signal.Provides extensive delay effects
such as tape echo multi-head simula-
tion and ambience effect of a concert
hall.
⑦FOOTSWITCH
Switch for effect on/off. Stepping on
this switch alternately turns effects on
and off.
⑧LED INDICATOR
This indicates the bypass/effect status
and battery condition. It lights when
plug is inserted to input jack and effect
is on.
No LED light indicates the battery is
low or not installed. In this case re-
place the battery.
⑨DC INPUT (power input jack)
A jack for connection of external pow-
er supply to effect.Be sure to use the
correct Maxon AC adaptor.
Turn down amplifierʼs volume to
the minimum before connecting
AC adaptor or DC plug.
5
ENGLISH
AD9Pro
effects such as tape echo multi-head simulation and ambience effect of a concert hall.
●True Bypass Switching on both outputs with 4PDT mechanical switch.No alteration to tone
of dry signal when effect is bypassed.
●Two-way power operation, using 9V alkaline battery or optional AC adaptor. (9V alkaline
battery: more than 7 hours, 9V manganese battery: more than 2 hours) Easy-access, tool-
free battery compartment.
●AD9Pro uses a stabilized DC to DC converter to bump up to 9V (plus and minus 4.5V).
Battery voltage drop and fluctuation of AC power source do not affect the tone and function.
●AD9Pro uses a stabilized DC to DC converter to bump up to 9V (plus and minus 4.5V).
Battery voltage drop and fluctuation of AC power source do not affect the tone and function.

6
SAMPLE SETTING
Please visitwww.maxon.co.jp to listen to audio samples.
(Amp: Marshall AVT-150)
1st2nd
No.1 Ambient Delay (G: Les Paul STD/
PU: Hum, Amp: Clean)
Provides ambience sound with DUAL
mode switch. Adjust FEEDBACK to get
the reverb effect.
No.2 Slapback Delay Riff (G: Les Paul
STD/PU: Hum, Amp: Clean)
Distinctive pattern of delay effect. (Sim-
ple short delay is added to mute
phrase.) Adjust FEEDBACK moderately.
No.3 Rhythmic Delay (G: Combat/PU:
Hum, Amp: Crunch)
Keeps the pace of delay time with riff
tempo. Delay follows the riff tempo.
No.4 Dual Delay + Feedback (G: Les
Paul STD/PU: Hum, Amp: Drive)
1st unitʼs delay is long with DUAL mode.
2nd unitʼs delay adds soundscape. You
can make feedback by turning up the 2nd
unitʼs FEEDBACK knob.

Input Impedance
Output Impedance
Residual Noise
Delay Time
Equivalent Input Noise
Control
Switch
Operating Voltage
Power Consumption
Dimensions
Weight
Battery
Battery life
Options
* Specifications are subject to change without notice.
: 500k ohms
: 10k ohms or less
: -100dB or less (IHF-A)
: 20mSec – 450mSec
: -116 dB or less (IHF-A)
: DELAY TIME, FEEDBACK, DELAY LEVEL
: SINGLE/DUAL MODE, EFFECT
: 9V
: DELAY TIME MIN 39mA/DC.9V 38mA/DC.10V
: 74(W) x124(D) x 54(H) mm
: 580g (including battery)
:
9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor
: manganese dry battery more than 2 hours 25deg C / 77deg F
(Panasonic 6F22NB)
:
alkaline dry battery more than 8 hours 25deg C / 77deg F
(Panasonic 6LR61G)
: Maxon AC adaptor
7
CONNECTION DIAGRAM
SPECIFICATIONS
ENGLISH
AD9Pro

18V Ö 9V
8
VOP9 Vintage Overdrive Pro
FEATURES AND CONTROLS
①IN (input jack)
Input jack to connect to the output of guitar,
other effects or related equipment. The
product automatically turns on when a plug
is inserted into this jack. When not in use,
disconnect plug from input jack to preserve
battery life.
②OUT (output jack)
Output jack to connect to input of amplifier
or other effects.
③DRIVE
This controls overdrive level. Turn it clock-
wise for more distortion.
④TONE
This controls the amount of high frequen-
cies. Turn it clockwise for more treble and
counter-clockwise for less treble.
⑤LEVEL
This controls output level of effected signal.
Typically output levels of both normal signal
and effected signal should be adjusted to
equal levels.
●Vintage Overdrive Pro VOP9 adds natural and warm nuance to your guitar sound like that of
a good vintage amp. Specially designed circuit reacts precisely to every fingering or picking
nuance with minimal compression.
●VOP9 combines functions of clean booster and overdrive. With Drive Control level set to
minimum, the overdrive circuit works as a -12dB attenuator, and the clean boost circuit as a
6dB booster to create clean and flat boost sound. When turning up the drive level control,
signal from overdrive circuit is blended in against clean signal until full overdrive tone is
reached at Drive Control maximum level setting.
●JRC NJM4558D IC op-amp offers low-noise overdrive sound. The overdrive circuit is the
same as OD9, using a diode in op-amp negative feedback loop.
●Operating voltage is switchable via an internal DIP switch accessible through the unitʼs

battery compartment. Improved operation at 18 volt setting eliminates unintentional
distortion caused by high-output pickups and active electronics VOP9, exemplifies its
overdrive performance when connecting to tube amp with high dynamic input range.
●True Bypass Switching with 4PDT mechanical switch. No tone changes when switching
bypass and effect.
●Two-way power operation, using 9V alkaline battery or optional AC adaptor. (9V alkaline
battery: more than 20 hours at plus/minus 4.5V) Easy-access, tool-free battery
compartment.
●VOP9 uses a stabilized DC to DC voltage converter to bump 9V (plus and minus 4.5V) up
to 18V (plus and minus 9V). Battery voltage drop and fluctuation of AC power source do not
affect the tone and function.
⑥FOOTSWITCH
Switch for effect/bypass.Stepping
on this switch alternately turns ef-
fects on and off. 
* Effect turns on when you depress
the switch and effect turns off when
you depress and release the switch.
⑦LED INDICATOR
This indicates the effect/bypass sta-
tus and battery condition. It lights
when plug is inserted to input jack
and effect is on. No LED light indi-
cates the battery is low or not in-
stalled. In this case replace the battery.
⑧DC INPUT (power input jack)
Jack for connection of external pow-
er supply to effect. Be sure to use
the correct Maxon AC adaptor. 
Turn down amplifierʼs volume
to the minimum before con-
necting AC adaptor or DC plug.
⑨OPERATING VOLTAGE SWITC
Slide it to right side for 9V ( ± 4.5V)
and left side for 18V ( ± 9V).
* Turn down amplifierʼs volume to
the minimum before sliding this
switch
⑩INTERNAL LED INDICATOR
This indicates the status of operating
voltage. It lights at 9V ( ± 4.5V). No
LED light indicates the operating vol-
tage is 18V ( ± 9V).
9
VOP9
ENGLISH

No.1 Vintage Warmth (G: Godin SA/
PU: Single, Amp: Clean)
Makes half tone with Single PU deep
and powerful. Natural and well-bal-
anced sustain is available.
No.2 Powered Crunch (G: Combat
TE warm/PU: Hum, Amp: Crunch)
Boost setting. Simple amp crunch
sound is boosted straight through
VOP9ʼs mild overdrive sound.
No.4 Full Drive (G: Combat/PU: Hum,
Amp: Drive)
Full setting of drive level. Adds expres-
sive sustain and power to amp drive
sound. Provides controllable distortion
even at full setting.
No.3 70ʼs Overdrive (G: Les Paul/PU:
Hum, Amp: Crunch)
Smooth lead tone and crisp bucking
with Humbucker front position. Guitar
tone comes out straightforward.
10
SAMPLE SETTING
Please visitwww.maxon.co.jp to listen to audio samples.

11
CONNECTION DIAGRAM
SPECIFICATIONS
VOP9
ENGLISH
Input Impedance
Output Impedance
Maximum Gain
Equivalent Input Noise
Control
Operating Voltage
Power Consumption
Dimensions
Weight
Battery
Battery life
Options
* Specifications are subject to change without notice.
: 500k ohms
: 10k ohms or less
: 46dB (IHF-A)
: -112 dB or less (IHF-A)
:
DRIVE, TONE, LEVEL 18V (±9V) /9V(±4.5V) switch
: 18V( ± 9V)/ 9V( ± 4.5V)
:
30mA/9V, 28mA/10V at operating voltage 18V ( ± 9V) 
:
23mA/9V, 24mA/10V at operating voltage 9V ( ± 4.5V)
: 74(W) x 124(D) x 54(H) mm
: 580g (including battery)
:
9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor
: manganese dry battery ±9V 3.5 hours 25deg C / 77deg F (Panasonic 6F22NB)
: manganese dry battery ±4.5V 8 hours 25deg C / 77deg F (Panasonic 6F22NB)
: alkaline dry battery ±9V 10 hours 25deg C / 77deg F (Panasonic 6LR61G)
: alkaline dry battery ±4.5V 20 hours 25deg C / 77deg F (Panasonic 6LR61G)
: Maxon AC adaptor
IN
OUT

12
OSD9 Overdrive Soft Distortion
FEATURES AND CONTROLS
①IN (input jack)
Input jack to connect to the output of guitar,
other effects or related equipment. The
product automatically turns on when a plug
is inserted into this jack. When not in use,
disconnect plug from input jack to preserve
battery life.
②OUT (output jack)
Output jack to connect to input of amplifier
or other effects.
③DRIVE
This controls overdrive level. Turn it clock-
wise for more distortion.
④LEVEL
This controls output level of effected signal.
Typically output levels of both normal signal
and effected signal should be adjusted to
equal levels.
●“Choose Maxon for distortion.” People often said that for the legendary over-
drive OD880 swept the music scene in 1977 – 1980ʼs. OSD9 is an updated
version of original Maxon OD880 Overdrive/Soft Distortion.
●OSD9 has two controls like OD880. Creates natural, soft and warm distor-
tion like the sound of a tube amplifier. 
●Original UA741 op-amp installed for overdrive circuit offers low-noise over-
drive sound. OSD9 has a passive type distortion circuit which differs from
OD808/OD9.
●OSD9 is most effective with tube amp, using like a booster.

13
●True Bypass Switching with 4PDT mechanical switch. No tone changes
when switching bypass and effect.
●Two-way power operation, using 9V alkaline battery or optional AC adaptor.
(9V alkaline battery: more than 34 hours, 9V manganese battery: more than
17 hours) Easy-access, tool-free battery compartment.
●A stabilized DC to DC converter constantly provides stable DC9V power.
Battery voltage drop and fluctuation of AC power source do not affect the
tone and function.
OSD9
⑤FOOTSWITCH
Switch for effect/bypass.Stepping
on this switch alternately turns ef-
fects on and off. 
* Effect turns on when you depress
the switch and effect turns off when
you depress and release the switch.
⑥LED INDICATOR
This indicates the effect/bypass sta-
tus and battery condition. It lights
when plug is inserted to input jack
and effect is on. No LED light indi-
cates the battery is low or not instal-
⑦DC INPUT (power input jack)
Jack for connection of external pow-
er supply to effect. Be sure to use
the correct Maxon AC adaptor. 
Turn down amplifierʼs volume
to the minimum before con-
necting AC adaptor or DC plug.
ENGLISH

No.1 Tube Crunch (G: Godin/PU: Sin-
gle, Amp: Crunch)
Adds small vintage amp-like sound and
distortion, retaining single PU tone.
No.2 Fat Distortion (G: Godin/PU: Sin-
gle, Amp: Crunch)
Changes clean sound of amp into pow-
erful drive sound in an instant. Fat dis-
tortion is the distinctive characteristic of
OSD9.
No.3 OSD Boost (G: Combat/PU: Hum,
Amp: Crunch)
Adds bold distortion into amp crunch
sound. Overall distortion has distinct
characteristic.
No.4 Fat Blues (G: Combat/PU: Hum,
Amp: Crunch)
Makes amp sound fat and warm even
at moderate overdrive level. Unique fat
tone.
Please visit www.maxon.co.jp to listen to audio samples.
14
SAMPLE SETTING

15
Input Impedance
Output Impedance
Maximum Gain
Equivalent Input Noise
Control
Operating Voltage
Power Consumption
Dimensions
Weight
Battery
Battery life
Options
* Specifications are subject to change without notice.
: 500k ohms
: 10k ohms or less
: 41.5dB (700Hz)
: -107dB or less (IHF-A)
: DRIVE, LEVEL
: 9V
: 14mA/DC 9V, 14mA/DC 10V
: 74(W) x 124(D) x 54(H) mm
: 580g (including battery)
:
9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor
: manganese dry battery 17 hours 25deg C / 77deg F (Panasonic 6F22NB)
: alkaline dry battery 34 hours 25deg C / 77deg F (Panasonic 6LR61G)
: Maxon AC adaptor
CONNECTION DIAGRAM
SPECIFICATIONS
OSD9
ENGLISH
IN
OUT

16
OOD9 Organic Overdrive
FEATURES AND CONTROLS
●Updated version of very first Maxon overdrive, OD880.
●Overdrive sound from post-integration circuit smoothly changes according to
input level, offering highly dynamic response to picking technique. Creates
mild and warm overdrive like that of a tube amplifier.
●Industry-standard op-amp, JRC NJM4558D offers low-noise overdrive sound.
Employs a passive type overdrive circuit which differs from OD808/OD9.
●OOD9 is most effective with tube amp, using like a booster.
①IN (input jack)
Input jack to connect to the output of guitar,
other effects or related equipment. The
product automatically turns on when a plug
is inserted into this jack. When not in use,
disconnect plug from input jack to preserve
battery life.
②OUT (output jack)
Output jack to connect to the input of ampli-
fier or other effects.
③DRIVE
This controls overdrive level. Turn it clock-
wise for more overdrive.
④LEVEL
This controls output level of effected sig-
nal.Typically output levels of both normal
signal and effected signal should be adjus-
ted to equal levels.

⑤FOOTSWITCH
Switch for effect/bypass. Stepping on
this switch alternately turns effects on
and off.
* Effect turns on when you depress the
switch and effect turns off when you de-
press and release the switch.
⑥LED INDICATOR
This indicates the effect/bypass status
and battery condition. It lights when
plug is inserted to input jack and effect
is on. No LED light indicates the battery
is low or not installed. In this case re-
place the battery.
⑦DC INPUT (power input jack)
Jack for connection of external power
supply to effect. Be sure to use the
correct Maxon AC adaptor.
Turn down amplifierʼs volume to
the minimum before connecting
AC adaptor or DC plug.
17
OOD9
ENGLISH
●True Bypass Switching with 4PDT mechanical switch. No tone changes when
switching bypass/effect.
●Two-way power operation, using 9V alkaline battery or optional AC adaptor.
(9V alkaline battery: more than 23 hours, 9V alkaline battery: more than 10.5
hours) Easy-access, tool-free battery compartment.
●OOD9 uses a stabilized DC to DC voltage converter to bump up to 9V (plus
and minus 4.5V). Battery voltage drop and fluctuation of AC power source do
not affect the tone and function.

18
SAMPLE SETTING
No.1 70ʼs Crunch (G: Les Paul STD/
PU: Hum, Amp: Clean)
Creates crunch sound, which is
unique characteristic of OOD9. Based
on amp sound with moderated drive
level, OOD9 adds distortion without
changing original tone.
No.2 Organic Distortion (G: Les Paul
STD/PU: Hum, Amp: Clean)
Setting for natural expression retain-
ing your playing nuance.
No.3 Drive and Sustainer (G: Les Paul
STD/PU: Hum, Amp: Clean)
Booster setting. Provides more power
and sustain to amplifier distortion. Ef-
fective for both rhythm and lead.
No.4 Dual Drive (G: Les Paul STD/PU:
Hum, Amp: Clean)
Dual drive sound with OOD9 and
OSD9. First OOD9 provides basic
overdrive sound. Then OSD9 adds fat
and smooth sustain into OOD9ʼs basic
overdrive sound.
Please visit www.maxon.co.jp to listen to audio samples.

Input Impedance
Output Impedance
Maximum Gain
Equivalent Input Noise
Control
Operating Voltage
Power Consumption
Dimensions
Weight
Battery
Battery life
Options
* Specifications are subject to change without notice.
: 500k ohms
: 10k ohms or less
: 41.5dB (700Hz)
: -107dB or less (IHF-A)
: DRIVE, LEVEL
: 9V
: 18mA/DC 9V, 18mA/DC 10V
: 74(W) x 124(D) x 54(H) mm
: 580g (including battery)
:
9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor
: manganese dry battery 10.5 hours 25deg C / 77deg F
(Panasonic 6F22NB)
: alkaline dry battery 23 hours 25deg C / 77deg F
(Panasonic 6LR61G)
: Maxon AC adaptor
19
CONNECTION DIAGRAM
SPECIFICATIONS
ENGLISH
OOD9
IN
OUT

20
* Be sure the battery is firmly connected to battery snap with the correct polarities.
BATTERY REPLACEMENT
This product operates on one 9V battery (6LR61 or 6F22). Follow the procedures
below to replace batteries:
BATTERY REPLACEMENT
ATTENTION:
■Turn down the volume of effect and amplifier to the minimum before
connecting Maxon effects to guitar, amplifier or other effects in order not
to damage other connected equipment by unintended noise.
■When not in use, disconnect plug from input jack to preserve battery.
■Take out the battery if the product is not used for a long period of time.
■No or dark LED light indicates the battery is low or not installed. In this
case replace the battery to avoid poor effect or distorted signal.
■Be sure to use the correct Maxon AC adaptor. Use of any other
adaptor may cause trouble.
■Do not try to remove screws.