Electro-Harmonix BAD STONE User manual

Table of contents

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1

BAD STONE

Congratulations on your purchase of the Bad Stone, a reincarnation of the highly sought

after Electro-Harmonix classic from the ‘70s, now in a nano package. The Bad Stone is a

six stage phase shifter with variable rate, feedback, and a manual shift control that allows

you to freeze the phase and create new sonic landscapes. True bypass switching ensures

your tone won’t be colored when the pedal is bypassed.

CONTROLS

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 settings.

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

95kΩ.

AMP Jack –This ¼” jack is the audio output of the Bad Stone. The output impedance is

4.7kΩ.

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.

2

CHANGING THE BATTERY

To change the 9V battery, you must remove the 4 screws on the bottom of the Bad Stone.

Once the screws are removed, you can take the bottom plate off and change the battery.

Please do not touch the circuit board while the bottom plate is off for risk of damaging a

component.

WARRANTY INFORMATION

Please register online at http://www.ehx.com/product-registration or complete and return

the enclosed warranty card within 10 days of purchase. Electro-Harmonix will repair or

replace, at its discretion, a product that fails to operate due to defects in materials or

workmanship for a period of one year from date of purchase. This applies only to original

purchasers who have bought their product from an authorized Electro-Harmonix retailer.

Repaired or replaced units will then be warranted for the unexpired portion of the original

warranty term. If you should need to return your unit for service within the warranty

period, please contact EHX Customer Service at 718-937-8300 or info@ehx.com for a

Return Authorization Number. Along with your pedal, please include a brief description of

the problem as well as your name, address, telephone number, copy of your receipt, and a

check or money order.

United States - $12 Ship to:

Canada - $15 Electro-Harmonix

Europe and outside countries - $25 C/O New Sensor Corporation

55-01 2nd Street

Long Island City, NY, 11101

Attn: Service Department

Please make checks/money orders payable to New Sensor Corporation.

To hear demos on all EHX pedals visit us on the web at www.ehx.com

Email us at [email protected].