They have arrived, and are getting into the test queue. If they meet my requirements, expect to see them around mid-April. Once they are...

Here's a cool trick I thought of in the middle of the night. You can use an S3 Switch with an FS5 filter to set up a Bypass/Q1/Q2 toggle....

Manuals for the FS5, FV4, and FT4 are complete. PS4, PD4, and FE4 manuals are coming soon... See them on the support page.

With many onboard preamps, the pots are soldered onto the preamp circuit boards. If you break a pot or wear it out, you have to return...

They are fully tested and tuned, and up for sale on the web site. I am frantically working on user manuals that should be in the support...

The FE4 Three Band EQ prototype is up and running, and I'm honing in on the tuning. This is a parametric equalizer with shelving type...

I made up some boards for MEC push-pull pots, to use with the FS4 switched filter. These are the same as used on Wal. They work just...

Check out the Roadmap for info on the upcoming FT5 and FS5 filters.

Two new products have been added to the lineup. The first is a single channel version of the PD4 Preamp, the PS4. It can take two filters...

The FS4 Filter has been redesigned to work with a single pole (S1) switch. This makes it possible to switch two filters hi or low with...

It's not finished, but the Gen4 manual is started, and has enough information to help you install and configure the PD4 Preamp and filters.

The FT4 Treble Boost Filter is finally available. Check it out on the Filter Modules page. I will be adding a "Full English" preamp...

The photos are old, that will take a while to update. Thanks for your patience!

After months of experimentation and testing, the FP4 is ready and available on the store! Read about it on the filter page. Here are some...

PD4 Dual Preamp - I am heavy into the design of the new preamp. New features are: Dry signals from the pickups can be sent to a high pass...

I just received the first batch of custom concentric potentiometers that can be used for frequency and Q on a variable filter, or...

By popular demand, the FV1 Filter (Alembic style variable Q) has been updated with a bypass switch connector. While it is possible to...

After long hours of experimentation, I finally have a parametric filter setup that is way cool. My early efforts focused on separate...

I have updated the example preamp systems, hopefully they will be a little easier to navigate. All of the potentiometers have been...

Built and tested the first FP1. The chart shows the frequency response at various settings. I'm SUPER excited! The sound is really great,...