Please note: this is not the original release of PH-1. It's the 40th anniversary reissued version. Original box missing

In 1977, phaser pedals had been around for a while, and there were a few popular competing models on the market. For the PH-1, BOSS engineers worked to create an improved design with better clarity and a deeper modulation range. In comparison to other four-stage phasers of the era, the PH-1 has a more natural and mild sound, with a richer low-end response. In addition, there’s a minimal level difference when the effect is turned on, thanks to its integrated output boost circuit. For the PH-1 reissue, the FETs for the four phase-shifting circuits have been carefully matched to make the response characteristics exactly like the original pedal. Furthermore, each individual preset resistor has been meticulously tuned by hand, replicating the same process that went into building the original PH-1.

Nominal Input Level
-20 dBu
Input Impedance
220 k ohms
Nominal Output Level
-20 dBu
Output Impedance
470 ohms
Recommended Load Impedance
600 ohms or greater
Bypass
Buffered bypass
Controls
Pedal switch
RATE knob
DEPTH knob
Indicator
CHECK indicator (serves also as battery check indicator)
Connectors
INPUT jack: 1/4-inch phone type
OUTPUT jack: 1/4-inch phone type
DC IN jack
Power Supply
Alkaline battery (9 V, 6LR61) or Carbon-zinc battery (9 V, 6F22)
AC adaptor (PSA series: sold separately)
Current Draw
15 mA
Expected Battery Life Under Continuous Use
Alkaline: Approx. 53 hours
Carbon: Approx. 27 hours
* These figures will vary depending on the actual conditions of use.