This is a video showing off my DIY build of Drip's u73b model.

The u73b is supposedly the fastest ever valve limiter. With the addition of the Varicom which in essence uses a FET to compress the and average out the two control lines it uses (I think) the compressor/limiter's fastest release to do this which in this case is using the fairchild 670 time constants, faster than the original telefunken specs.
The original telefunken model also has instructions for setup and calibration but I have adjusted this for better usage with modern application.

It was one of my first DIY builds but took the longest due to a number of issues that needed ironing out, this was drip's V1 of the pcb so expected I guess. Please feel free to hit me up on the below email address if you need any help or advice if you are getting stuck, I know this one if particularly difficult. Check groupdiy.com username leeksoup, I have contributed a little information to that forum.

Known issues are: Gregory's errata in the manual, better power transformer needed (372EX I think), comp/lim not switching (fixed on V2 board), the plate choke is supposedly incorrect although I did not observe any difference, installation of the varicom requires 10Meg resistors to override the attack and release paths on a switch, sowter colours red and orange must be switched on varicom board.

I use this unit all the time its awesome and really makes things jump out in the mix, it is sophisticated and way more interesting than a 670, this is not to say it is better, it just has more flexibility whereas you know what you're getting with a 670.

The audio is captured using an Antelope ZenTour, Creamware A16 and Ableton Live. Mic captured is a Coles 4038 with Ward Beck M460 and Drip's Opto7.

I'm interested in selling this one or building a second unit if anyone's interested in a quote, hit me up, email below.

DRIP www.dripelectronics.com - PCB designer and creator
MY EMAIL: lee@shutteraudio.com
ME - www.leeis.co.uk
SHUTTER AUDIO who produced the music - www.shutteraudio.com
MY TWITTER for my radio show mainly - @syncintothis
EXTREME MUSIC www.extrememusic.co.uk - the main track playing is 'Pandora's Box' by Sarah Jane Norman, Lee Richardson, Tom Ford, Jonathan Murrill & James Cocozza

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