Unit 5, Silveroaks Farm, Hawkhurst Lane, Waldron, Heathfield, E.Sussex, UK, TN21 0RS
Tel (0)1435- 813393, International +44 1435 813393
VAT Reg. No. GB 241 7291 72






Our low noise discrete component Class A pre-amplifier has been specifically designed to overcome the problems often encountered with amplification of Electric Instruments fitted with magnetic transducers. The usual cause of these problems is the mismatch of the impedance in the electrical circuit between the pickup and subsequent equipment: this mismatch has been completely eliminated with the introduction of our LD-3™ Line Driver/mute/Tuner Feed unit.

The input impedance is identical to a high quality tube amplifier and our Class A Pre-amplifier also features a highly effective RF filter which will help prevent interference from nearby radio transmitters.

The pickup output should be connected directly to the Line Driver input with a short, low loss, screened cable; the Line Driver output can now be fed to any effects or volume pedals (if used) and then on to the amplifier, using fully screened cables, of any length, throughout.

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 but has additional isolation components to ensure that interference signals, which may be generated in a tuner, are not fed back to the amplifier. The Tuner Feed signal is permanently active.

The heavy-duty footswitch controls the signal sent to the main “OUTPUT” jack and provides a complete shutdown of the audio signal path when set to “MUTE”


Triple purpose: Line Driver, Tuner Feed and Mute in one convenient package: compact size housing 100 x 120 x 36mm

Each unit is hand built, wired and tested by Pete and Lynda Cornish.

Heavy Duty all-metal footswitch with Daylight Visible LED's.

Easy battery is replaceable via the removable “drawer”. The battery is switched on when you insert the “INPUT / PWR ON” 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, or to be adapter powered, 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 coax connector is 5.5/2.1mm and the center pin is negative (-VE). The adapter should be noise free, fully stabilized at 9V DC and capable of supplying 20mA. We recommend the use of Voodoo Lab Pedal Power 2 Plus adapter as meeting the above criteria and cannot accept any liability for damage caused to this unit by the use of, or to, any other type of DC adapter. An adapter proving an output of an AC voltage should NOT be used. If only a single unit is to be powered the BOSS PSA series may be more cost effective and is also recommended.


This unit is capable of being used with any stabilized, noise free supply voltage between 9Vdc and 24Vdc.

Using a 9Vdc adapter the performance will be identical to when Battery powered.

Using a fully smoothed and regulated AC/DC adaptor with an output voltage of 24vDC Maximum, and capable of supplying 20mA, the signal performance of the unit will be as show below.

Please do not use an adaptor with a higher output voltage than the specified 24vDC maximum, or of reversed polarity, as it may damage the LD-3™. An adapter with an AC voltage output should NOT be used as it will permanently damage the LD-3™. Damage caused by the use of the incorrect adapters mentioned above will not be covered under the terms of our warranty.

SPECIFICATION (with 9vDC supply):

SPECIFICATION (with 24vDC supply):

Input Impedance                                    1 Mohm

Input Impedance                                    1 Mohm

Minimum Output Load                           10 Kohm

Minimum Output Load                           10 Kohm

Maximum Output                                   +9dBm/2.2Vrms/6.25 v P/P

Maximum Output                                   +18dBm/6.2Vrms/17.6v P/P

Output Noise                                         -110dBm (10KHz B/W)

Output Noise                                         -110dBm (10KHz B/W)

Frequency Response                              +/- 1dB 15 Hz to 20 KHz

Frequency Response                              +/- 1dB 15Hz to 40KHz


This unit has been built using the finest available components and constructed to the highest standards but should any fault occur during the twelve months from date of purchase please return it post paid to the above address where under guarantee repairs of any original manufacturing fault will be carried out (normal wear, misuse, unauthorized modifications or accidental damage excepted). The warranty will be voided if the guarantee labels are damaged or removed. This warranty does not apply to customer's own equipment, which has been connected to this unit.

This warranty is non-transferable.

©Pete Cornish™ 2009  E. & O.E.