The Synthrotek PT2399 DEV Delay Unit Mimics Old-School BBD Delays


Here’s a quick video demo of the Synthrotek PT2399 Dev Delay Console unit – a pre-built delay unit, with Feedblast, Feedback, and Warp mods all added:


  • Feedback mod that gives you more control over rate, feedback, and mix.
  • Based off of Princeton’s PT2399 Echo Application Circuit (straight off the datasheet), this PCB gives you the exact set-up recommended by the manufacturer. Engineers and hobbyists alike can use this basic design to modify it for their own purposes The PT2399 Echo Processor IC is a very versatile circuit with adjustable input/output filtering, delay length, wet/dry mix, and a lot of unexplored potential!
  • On-board 5V regulator allows for multiple powering options and interfacing with digital circuits. Use a 9V battery, 9-18V Center Negitive AC Adapter.
  • 2 potentiometer placement positions adhere to the datasheet schematic, allowing for direct control over how much delay is present in the output signal. Delay length is variable from fast slapback echo to long dub-style repeats to noisy long repeat madness! Mix allows you to set the wet/dry portions of the signal.
  • The PT2399 Echo IC was designed to mimic old-school analog BBD delay with modern digital sampling technology. Repeats degrade at higher delay lengths, resulting is a very natural well-filtered reproduction of your synth/guitar tone.
  • Enclosure Dimensions: 4.38″ x 3.25″ x 2″

The Synthrotek PT2399 DEV Delay Complete Unit is available at the Synthrotek site for US $75. The kit version (no enclosure) is available for $24.

8 thoughts on “The Synthrotek PT2399 DEV Delay Unit Mimics Old-School BBD Delays

  1. It’s a pedal but he’s demo’ing it with a modular. I wonder does this mean it has enough headroom for line level? I was about to pick up a vintage Roland rack BBD but this would be cheaper and smaller.

  2. all my delay pedals are bbd based and used with line signals, the only pedal that needs care with incoming signals to avoid ugly distortion is my Behringer Time Machine, it cant take a hot signal but its a very nice pedal.

    maybe Im alone here but I like the clock noise, it adds character, you can eq it out if you want anyway.

    the joyo pedals use PT2399 chips, and even some of the boutique pedals use them, I think Ill get a dev kit to try out. lo-fi digital has its charm

  3. Clock noise is sometimes a feature rather than a bug. People liked it just fine when a Prophet-VS was slicing cheese with the sharpness of that effect in some patches. I have to give this a thumbs-up. If I was still going at music from my old hardware stack, I’d plug something like this into every synth. It really puts some humanity into the sound when you can twist that *one* crucial m*r*fck*r at the end of the chain for better squeee. If you’ve never done that, try it. Sometimes a noisy pedal rocks it.

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