EHX has resurrected the legendary Bad Stone Phase Shifter. With prices
of 1970s’ vintage Bad Stones soaring, now is your chance to get a
reissue that is faithful to the original circuit design and three-knob
control layout, but features up-to-date enhancements for the modern
The Bad Stone delivers an incredible six stages of phase shifting plus a
manual mode that lets the player freeze the phase. Its Rate knob
controls the phase shifting speed which goes from a very slow swoosh to a
rapid, oscillating warble. Feedback determines the depth of the phase
effect and a toggle switch lets the user select Auto or Manual modes.
In addition to the die-cast package, other modern amenities include true
bypass for maximum signal path integrity, an effect status LED and an
AC jack that accepts an EHX9.6DC power supply.
- A faithful reincarnation of the legendary 1970s Bad Stone with carefully selected updates for the modern player
- The Bad Stone was the first phase shifter to employ variable feedback and features an awesome six stages of phase shifting
- Manual Shift mode that lets you freeze the phase
- Compact, rugged die-cast package
- True bypass switching for maximum signal path integrity
- Effect status LED
- Built-in AC jack that accepts an optional EHX9.6DC power supply, comes with a 9V battery
RATE Knob – Controls the Bad Stone’s modulation speed by setting the
frequency of the internal low frequency oscillator (LFO). The speed
ranges from 0.05Hz to 32Hz. (Note: The original Bad Stone’s LFO
frequency range was 0.2Hz to 32Hz. We felt that altering the original
design to allow for slower phasing, thus making this pedal not a 100%
true reissue, made for a better overall product.) This control is
disabled when the AUTO/MANUAL toggle switch is set to MANUAL mode.
FEEDBACK Knob – Controls the amount of signal fed back from the
output of the phase shifter circuit into the input of the phase shifter
circuit. As you turn the feedback control up, the phase shift effect
will sound more pronounced and even sound resonant or “peaky” at high
MANUAL SHIFT Knob – Sweeps through the phase shifter’s range,
creating a sort of “cocked wah” sound. For maximum effect, make sure
the FEEDBACK knob is in its full CW position. This knob is only active
when the AUTO/MANUAL toggle switch is set to MANUAL mode.
AUTO/MANUAL Switch – In AUTO mode the Bad Stone’s LFO modulates the
phase shifter. In MANUAL mode the LFO is disconnected and the MANUAL
SHIFT knob sweeps through the full range of the phase shifter.
INPUT Jack – This ¼” jack is the audio input of the Bad Stone. The input impedance is 95k?.
AMP Jack – This ¼” jack is the audio output of the Bad Stone. The output impedance is 4.7k?.
9V Power Jack – The Bad Stone operates with a standard 9V battery or
an optional 9VDC AC Adaptor capable of delivering at least 25mA to the
9V power jack, such as the EHX9.6DC-200. The AC Adapter must have a
center negative plug. The battery may be left in or taken out when
using an AC Adaptor. The Bad Stone has a current draw of 18mA at 9VDC.