Adjustable Gain Magnetic/Piezo Buffers – AGMPB & AGMPBoo

Dual-channel buffer/preamps with totally flat response and independently adjustable gain on both the piezo and magnetic channels.

List Price:

$95.00$110.00

 how to buy

SKU: Adjustable Gain Magnetic/Piezo Buffer Category:
SKU: Adjustable Gain Magnetic/Piezo Buffer Category:

The AGMPB/918 is a dual-channel buffer/preamp that provides a high impedance input for use with piezo or microphonic transducers and channel isolation for magnetic pickups. Both channels are equipped with trimmers for adjustable gain allowing you to boost the output signal up to 12dB (4x) while maintaining a perfectly flat response. It is less than 1/2 the size of a 9-volt battery making it ideal for instruments with limited cavity space. The AGMPB/918 provides a powerful output signal and isolation from external equipment that may otherwise adversely affect pickup tone. This is an upgrade replacement for the MPB2-918 simplifying wiring and adding true gain adjustment to both channels.
The AGMPBoo is a further advancement that adds connector pins for up to 7 industry standard piezo bridge saddle plugs. This simplifies wiring connections further and eliminates the need for a separate 2.0mm pitch summing connector.
The AGMPB/918 and AGMPBoo are ideal for providing excellent tone from an instrument with 1 or 2 magnetic pickups and a piezo bridge pickup. Both channels deliver clear and transparent sound with extremely low distortion. Like all of our preamps, they are internally shielded to reject electromagnetic noise and include filters to block AM and FM radio signals on the inputs. Bartolini set the standard for fully sealing the sensitive electronics. We use only professional double tin-plated pure copper wire with durable semi-rigid insulation. This ensures that the 4-inch pre-stripped wires do not flop around in the cavity and that the wire does not cut through the insulation over time.
Both buffer/preamps can be used with a single 9-volt battery (9-volt operation) or with two 9-volt batteries wired in series (18-volt operation) for 6dB extra headroom with no tonal change. Both deliver clear and transparent sound with extremely low distortion. The buffers are sold as kits that include a 25KOhm blend pot.

Ordering Details

Model Description UPC Price
AGMPB Kit Buffer, Adjustable Gain, Dual Channel - 1 Mag, 1 Piezo, 9 or 18V with Active Blend Pot 682384506936 $95
AGMPBoo Kit Buffer, Adjustable Gain, Dual Channel - 1 Mag, 1 Piezo Connector, 9 or 18V with Active Blend Pot 682384506950 $110

Ordering Details

Model UPC Price
AGMPB Kit 682384506936 $95
Buffer, Adjustable Gain, Dual Channel - 1 Mag, 1 Piezo, 9 or 18V with Active Blend Pot
AGMPBoo Kit 682384506950 $110
Buffer, Adjustable Gain, Dual Channel - 1 Mag, 1 Piezo Connector, 9 or 18V with Active Blend Pot

Magnetic/Piezo Buffer Technical Details

Module Size:
1.05" [26.7mm] Long,
0.79" [20.1mm] Wide,
0.43" [10.9mm] Thick
Operating Voltage:
9V or 18V
Magnetic Channel Input Impedance:
1MΩ
Piezo Channel Input Impedance:
3.3MΩ
Output Impedance:
3.6KΩ

Magnetic Channel

  • The pre-wired gain trimmer lets you adjust the output level of the magnetic channel.
  • Gain: 0-12dB

Piezo Channel

  • The pre-wired gain trimmer lets you adjust the output level of the piezo channel.
  • Gain: 0-12dB