![]() The basic EQP-type filter circuit is actually quite simple, requiring surprisingly few components, so I just needed to add high-quality gain makeup and I/O and we’d have a powerfully musical device that anyone can build. and (lightbulb!!) what a perfect project for the DIY community! Wanting to save rack space and eyeing the empty slots in my 500 rack, it hit me: I need to build some Pultec-style EQs to fill those slots. ![]() Recently I put together a mix room in my house, and I’ve been craving a few more Pultec-style channels for processing stems (I mix out of the box). In fact, its effect feels so natural you need to be careful not to overuse it. And because the Pultec filters are passive, they do all of this while sounding totally natural. And the LF controls can add immense, unflappable fullness to your low end as well as tame the unwanted mud and weight from bottom heavy sources. this is all about tone! Of particular interest (especially for those working in the DAW environment) is the inductor-based HF boost band which can add clarity and sheen while remaining entirely sweet without any hint of harshness (try that with most EQ plugins!!!). ![]() Appropriately referred to as a ‘program EQ’ these units paint with broad, deeply enhancing strokes that make them a proper choice for both tracking and mixing. Well, I’m pleased to say that my latest idea is one specifically aimed at the DIY community-a 500-series Pultec EQP-style equalizer! Drawing Inspiration from a Classicįor more than a decade now the filter topology used by Pulse Techniques (aka “Pultec”) in their EQP variants (EQP-1/1R/1A/1A3/1S3 and EQH-2) has been my absolute favorite EQ circuit. I eventually began to come up with circuit ideas of my own. But each lesson learned was invaluable, and after a while I figured out not only how to make great gear, but I began learning how circuits worked and what it was made these old designs so great. Along the way I made a lot of mistakes, of course: bad grounding (“hummmmm.”), popped caps, burned up power supplies, toasted transistors and opamps, etc. This was long before sites like DIYRE came along, of course, and I had to figure out how to do things pretty much from scratch. ![]() I love DIY! I got my start building gear almost two decades back by scouring the internet (a much smaller internet back then) for schematics of classic gear in hopes of building the stuff I couldn’t afford to buy. ![]() Today's post is by Joel Cameron of Rascal Audio, who's collaborating with us on a new EQ kit. ![]()
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