The Pure Preamp made by K&K Sound Systems will enhance the performance of magnetic pickups, piezo contact pickups, high-impedance microphones, and other high impedance, low-level sources. (It can work with low-impedance microphones too, but not optimally).
The Pure Preamp is practically noise-free and the fidelity of the output signal is excellent. It’s wonderfully compact – just 2.5” x 3.5” x 1.25” (including the knobs). It comes with a belt clip, so you can wear it when you play, keeping cable lengths from the pickup to the pre-amp to a minimum. Or perhaps, if this works for your instrument, you’ll prefer to devise some simple way to mount it directly on the instrument. There is no additional wiring or soldering required; nor is it necessary to make any modifications to your instrument. You just plug in the cables from the pickup and to the power amp, and play. It has easily accessible volume, bass, midrange and treble control knobs – almost like having controls on the instrument itself. In addition, there’s a gain-control located inside the unit which allows you to adjust the input signal strength as needed for particular instruments.
High-impedance signals, particularly the ultra-high impedance signals coming from piezo contact pickups, tend to lose both fidelity and signal strength when they pass through cable runs of more than a few feet. The solution to this problem is to include a pre-amp in the signal path as close as possible to the pickup. The pre-amp will boost the signal, making it more immune to unwanted noise pickup, and it will convert it to a lower impedance, allowing for longer cable runs without loss of fidelity or signal strength. The K&K Pure Pre-amp is ideal for this purpose.
Further details: The Pure Preamp has standard quarter-inch jacks for input and output. Unplugging the input works like an off switch to prevent battery drain. It uses a standard 9-volt battery; battery life up to 180 hours playing time. Frequency range: 10 – 30,000Hz. Input impedance: 1 mega Ohm; output impedance: 10 K Ohm. Comes with a one-year warranty.