Maxon PT9Pro Plus Phase Shifter Effect

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Made in Japan

The PT-9 Pro+ circuit begins with an Op Amp buffer, then the signal is split (chain 1 goes into effect; chain 2 is recombined with affected signal before output buffer). The phase shifting section uses 6 stages, similar in design to the MXR Phase 100. The phasing is accomplished through parallel resistors and capacitors between the phasing section Op Amps (one for each stage).

The LFO sine wave signal is accomplished by another pair of Op Amps and is controlled with the Speed and Depth controls. The LFO interfaces with the phase shift stages through optocouplers (photo cells) that control the frequency emphasis of the phase shift stages. After the phase shift stages the Feedback potentiometer controls the amount of phased signal injected back into the circuit before the phase shift stages, affecting the emphasis of the phase in a similar manner to a “Q” control.

After the phase shift stages the affected signal is mixed with the signal from the Op Amp buffer from the beginning of the circuit and goes into an output amplifier that provides low impedance out.

The pedal also utilizes a, NJM2374A voltage conversion chip that changes the 9V power input into 9V+ and 9V-, increasing the headroom of the Op Amps and cleaning up the sweep of the phase.

The PT-9 Pro features Mechanical True Bypass switching via a Fujisoku 4PDT switch – Input is switched to ground when bypassed.

NOTE ON POWERING THE PT-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 PT-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.

Input Impedance 500k ohms
Output Impedance 10k ohms
Maximum output level +18dBu (1kHz)
Speed Frequency 0.055 to 8.3Hz (18Sec to 120mSec)
Residual Noise -95dB (Input shorted, IHF-A weighted)
Control SPEED,FEEDBACK,WIDTH
Indicator BYPASS／EFFECT LED,RATE LED
Power Supply 6F22/6LF22 9V battery x 1 or Maxon AC adaptor
Internal circuit voltage ±9V(DC to DC Converter)
Power Consumption 32mA/9V,30mA/10V
Battery life Panasonic NEO battery 6F22NB Approx 3.0 hours
@ 77deg F / 25deg C
Panasonic ALKALINE battery 6LR61G Approx 8.4 hours
@ 77deg F / 25deg C
Dimensions 74(W)×124(D)×54(H)mm
Weight 580g (including battery)
Accessory 6F22 9V battery x 1, operating manual