My great bassist friend Wally came for a visit, and we recorded some demos of the Underhill filter preamp. This is the first of at least three, a smooth disco funk line to Jamiroquai's Cosmic Girl. Hope you enjoy it!

Andy posted a great video of a new bass he modded with a Multicoil Full English and Turner pickups. Check it out.

I have added the "Cosmic" and "Cosmic Crisp" configurations to the list of pre-configured Filter Preamps! They are low-power easy-to-use setups with a Volume/Blend/Tone type configuration, using the FV Filter. You can, of course, use any of the other filters or EQ modules in the "tone" position. COSMIC, MAN COSMIC CRISP

The custom pots finally arrived, and the CVS Volume 6.1 module is now available for $22.50. The main difference is the size, it is more compact and will be much easier to fit in a tight cavity, or a front cavity like a P bass. Plus it's $8 cheaper than the old one!

The ESB Bass EQ and EST Treble EQ are now available in Preamp Parts . Similar in range to the EPB and EPT, but with a gentle first order shelving profile. They are great for a familiar and easy-to-use two-band boost/cut layout, but have a frequency sweep control, which makes them handy when your amp only has fixed-frequency bass and treble.

If you are looking for technical specs on the various preamp modules, you can find them in the store pages. Go to Parts, and click on the...

I made basic wiring diagrams for one and two pickup installations. Since preamp systems are shipped with all the modules connected, this...

The BA and B5 buffers are now available in limited quantities (more in a week or two). The BA is for active pickups with high output,...

To give you an idea of what a Gen6 install looks like, here's a Paradactyl Uno (EPL and EPH EQ modules) with a coil switch in a small...

These are the two parametric EQ modules that were combined into the original Paradactyl preamp. Pro tip: Any EQ modules can be used...

Here are some diagrams showing the trimmer positions for various Q levels on the FS Filter (MED and HI switch positions), and FP Filter...

We stress out about every part of our product so you don't have to. Take the cables: The wire insulation is irradiated PVC, which is more...

A few users have mentioned that the connection markings on the new boards look like there are two "+" connections. If you look close...

At the heart of the new preamps is a new filter circuit with ultra stable performance, higher resonant boost, and reduced noise. They are...

I've been head down for three months working furiously to redesign the Underhill Preamp line. The website will be updated shortly. Key...

This is the PD preamp with dual FV Variable Q filters. Turner multicoil pickups. https://www.facebook.com/mark.manley.188/videos/15493268...

I am working on re-packaging the modules into an architecture similar to a pedal board. Some possible benefits are: Swappable buffers,...

These can be used for setting the bass and treble frequencies internally with an ET5 Equalizer. Boost/cut is then handled with single...

The miniature cables used on Underhill preamps and filters are quite robust, and can carry a lot of current (Apple uses them for the...

These have new tunings and use less power... Check them out.