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Pete Cornish

PETE CORNISH Acoustic Preamp/DI Grey Series


Our low noise integrated circuit Class A pre-amplifier has been specifically designed to overcome the problems often encountered with amplification of Acoustic Instruments fitted with ceramic transducers. A frequent cause of these problems is the mismatch of level and impedance in the electrical circuit between the pickup and the amplifier: this mismatch has been completely eliminated with the introduction of our Acoustic Instrument Preamp/ D.I Unit.

The pickup output should be connected directly to the Preamp input with a short, low loss, screened cable; the Preamp output can now be fed to any effects or volume pedals (if used) and then on to the amplifier. The Preamp gain control should be adjusted to a comfortable signal level with the amplifier volume control set to about 50%. Alternatively the gain can be set to match the signal level of another instrument (e.g. Electric or Bass Guitar) when they are both fed into the same amplifier.

Players of Acoustic (Double) Basses will find their previous problems with lack of low frequencies; poor sound when playing Arco; poor sound with volume or other pedals; poor response to double stopping; poor D.I. sound etc. etc. will be completely eliminated when our Preamp is used.

The D.I. output is a transformer coupled low impedance source on a male XLR connector. Pin 2 is in phase with the preamp input; pin 3 is reversed phase and pin 1 is the ground connection.

Also fitted is an auxiliary output, which may be used to feed a signal to a Tuner; this signal is identical to the main Output signal.

Dimensions: 171 X 121 X 55 mm


The battery is replaceable via the removable “drawer” and we recommend alkaline types. The battery is switched on when you insert the “IN / PWR” jack and to ensure long battery life unplug this lead when the unit is not in use. If the unit is not to be used for a long length of time, we recommend that you remove the battery. Preferred battery types are MN1604. Also fitted is an input for a DC adaptor: the size of the connector is M2.1 with negative (-VE) tip. The voltage rating of the adaptor should be fully stabilised at 9.6V and capable of supplying 20mA. We recommend the use of the BOSS PSA series adaptors (PSA-100/110/220 or 240 depending on your local AC supply voltage) as meeting the above criteria and cannot accept any liability for damage caused to this unit by the use of any other type of AC/DC adaptor.

Although the current consumption of our Stand Alone pedals is extremely low, giving an extended battery life, it may be appropriate to use an AC/DC Adaptor for long term usage. If a single pedal only is in use then the Boss PSA series will be cost effective but we do not recommend this unit for powering multiple effects as ground loops can become troublesome.

After extensive testing for both noise, stability and reliability we have pleasure in recommending the Voodoo Lab Pedal Power 2 Plus as being suitable for powering our range of stand alone pedals - particularly when multiple effects are in use. The isolated outputs of the Pedal Power 2 Plus prevent the occurrence of ground loops and the noise level is too low to measure.


Input Impedance

1 Mohms + 20pF
Gain (adjustable) 0dB (Unity) to + 20dB
Maximum Output to Amp +7dBm into 2 Kohms or above
Maximum Output to D.I. +4dBm into 2 Kohms or above


Input / Power On 1/4 in. Mono Jack
Output 1/4 in. Mono Jack
Tuner 1/4 in. Mono Jack
D.I. XLR Male Pin 2 Hot +
Pin 3 Cold -
Pin 1 Gnd