HPF Pre (by fdeck)

Series 3

hpf3Type: preamp
Feautures: volume control, adjustable high-pass filter, Input impedance / capacitance: 10 MΩ / 220 pF, Phase (polarity reversal) switch

This preamp was developped and is manufactured as part-time business by bassist Francis Deck. He doesn’t sell to outside the US: “Unfortunately, the world still has borders. The HPF-Pre product does not carry a CE marking. There may be other countries where the lack of regulatory approval is also a problem. While I am confident that the HPF-Pre would be approved if tested, the cost of testing runs into the thousands of dollars. This is simply impossible for a very small business.”
However, Francis makes the schematics of his preamps available to public for DIY projects.

https://sites.google.com/site/hpftechllc/home/hpf-pre

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