Since their introduction in the early 1980s, Maxon Nine Series designs have achieved a legendary status with pedal connoisseurs around the globe. The reasons for this are simple - superior sound quality and innovative features that offer a seamless interface between performer and performance. 20 years later this rule still holds true. Now available with improved circuitry including JRC4558 IC chips and True Bypass Switching, Maxon Nine Series effects remain the standard by which all others are judged.
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AD-9 Analog Delay Pro
When Panasonic closed down their BBD production line in the mid 2000’s, Maxon had a tall task ahead of them to redesign their legendary AD-9 Analog Delay around a different IC chip. The resultant AD-9 Pro trumps the original version, offering several new features and a decidedly superior tone.
The AD-9 Pro provides 450 milliseconds of fat, warm analog delay tone thanks to 4 x custom-made Maxon MC4107D Bucket Brigade IC’s. The delay repeats of the AD-9 Pro are filtered using Maxon's proprietary noise reduction circuitry which reduces the aliasing, clock noise and distortion common to analogs. The result is a rounder, smoother delay repeat that doesn’t overpower the original note.
With a wider dynamic range and max input level of +12 dB, the AD-9 Pro can accept signal from any source. This improved response offers a better balance between low and high frequency ranges, creating a delay tone that is clear and firm while still retaining that characteristic analog warmth. It also allows the Pro to be used in line level effects loops on amplifiers.
The AD-9 Pro features a Multi-Head mode controlled by a top-mounted mini switch. This switch activates a midstream delay feedback loop, creating polyrhythmic repeats against the main delay repeat. The Multi-Head mode can create a striking Tape Echo simulation, or it can be used to create ambient reverb effects at shorter delay time settings.
Topping off the AD-9 Pro are dual outputs that allow routing of the dry and delayed signals to two separate amps or mixer channels. Both outputs feature Mechanical True Bypass via a 4PDT switch.
Why Choose Maxon?
The AD-9 Pro offers superior sound quality to the original Maxon AD-9 as well as several new features.
The AD-9 Pro starts with a string of low gain, low voltage op amps designed to boost the signal and shape the sound without adding distortion. Signal then passes to a THAT4315s Compander - a precision low voltage, low noise Compander IC designed to boost signal while killing any noise. This IC brings the input signal up to an ideal level and keeps it there as notes decay. This is good for signal-to- noise ratio and also gives the delay chips a clean, strong signal to work with.
The 4 x Maxon MC4107D BBD delay IC’s are controlled by two clock driver IC’s. The driver is running the BBDs at a very low clock rate to achieve maximum delay time. This rolls off a fair amount of high frequencies, giving the AD-9 a big, warm delay sound.
The delay circuit has a switchable tap that grabs midstream delayed signal and adds it back in with the main delay signal. This setup is very reminiscent of the multi-head feature on vintage tape echoes (Roland Space Echo, etc.).
Both the tapped and untapped signals are sent through their own sets of filtering op amps (3 apiece) which help get rid of clock noise and hiss. Then the signal is sent through another THAT4315s Compander chip and into a mixing Op Amp (where the clean signal is mixed with the delay) and out.
The AD-9 Pro features Mechanical True Bypass switching on both outputs via a Fujisoku 4PDT switch.
NOTE ON POWERING THE AD-9 Pro - this pedal’s voltage regulator IC requires a high inrush current of approximately 2000 mA upon startup. When using with a Power Brick such as the Voodoo Labs Pedal Power 2+, this pedal should be connected to a high current power jack when possible.
If it is not possible to connect to a high current jack, you can power the AD-9 Pro by leaving a battery in the pedal. Upon initial start-up, unplug the external DC power input cable, engage the pedal, and then plug the DC power input cable back in – the pedal will now power up normally off the external power supply until you power down your pedalboard.
Mods & Mends
What Artists Say…
"If you want a delay pedal with rich tone and a ton of vibe get a Maxon AD-9 Pro! I love the ability to switch from single to dual head delay modes."
"Maxon pedals are just simply amazing. Thanks for making pedals that just sound great, all the fucking time!"
Input Impedance: 500K Ohms Output Impedance: 10K Ohms Residual Noise: -100 dB or less (IHF-A) Delay Time: 20 mSec to 450 mSec Equivalent Input Noise: 116 dB or less (IHF-A) Controls: Delay Time, Feedback, Delay Level Switch: Single/Dual Mode, Effect Operating Voltage: 9V Power Consumption: DELAY TIME MIN 39mA/DC.9V 38mA/DC.10V Dimensions: 74 mm (W) x 124 mm (D) x 54 mm (H) Weight: 80 grams (including battery) Battery: 9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor Battery Life: 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) Option: Maxon AC adaptor (Maxon AC210N for North America) * All specifications are subject to change for improvement without notice or obligation. All brand names and product names are trademarks or registered trademarks of their respective companies.
Available for Pre-Order Only! Ships in mid-February
Maxon Exclusive guitar effects pedals are only available for purchase right here at MaxonFX.com.