Bugbrand - PT Delay
2018 Version released November 2018
The PT Delay is a highly characterful delay processor built around the infamous PT2399 chip. It does not aim to compete with clever modern delays (so no microprocessor, tap-tempo, beat-sync, etc.) and instead presents a unique hands-on affair for textural sonic play. With soft-clipping stages, voltage-controlled delay time, powerful equalization and a true analogue approach, the PT Delay can produce tones akin to tape delays or gnarl down into degraded digital territories. Stand distinct!
"The first PT Delay was released in 2011. When I decided to tweak the design 'just a bit' it ended up taking many months and 10+ prototypes to reach the next stage, but, arriving in mid-2013, the (original) PT Delay Standard ushered in a new era as the first of my 'red module' format designs. The design was updated in 2015/6 and then again in 2018.
[The 'Standard' in the name hinted that I may someday design a 'Deluxe' version - don't hold your breath!]" -Tom Bugs
The 2018 version updates:
- The 1/4" input is now balanced (which can, of course, be used unbalanced).
- The CV control has changed to have a polarity switch with center-off for quick modulation muting.
- General circuit improvements as standard throughout my designs.
Input Section: Designed for typical line level signals with variable amplification up to 20dB. The input features the first of three LED saturation / soft-clip stages - these stages aim to keep internal signal levels to a standardized level so that, for example, overloading the feedback doesn't cause dramatic level changes (instead it overloads into sonic wonders, but without the amplitude running crazy). These clip stages can definitely be used for creative explorations.
Delay Drive / Feedback: Two controls to determine what goes into the Delay Core, each with Mute switch. The Delay Drive allows bursts of the input sound to be thrown in in true dub-style, while the Feedback (normalized from Delay Out) takes you from single repeat, through washy feedback and into overload.
Voltage Controlled Delay Core: Delay time is set by a combination of the main Delay Time dial summed with any external Control Voltage (CV) from the CV Input and CV Mod Depth control with polarity switch. The main control covers times from 35mS to 2.0S, but external CV can take the time longer (up to total digital jittery stop). Delays up to about 300mS (around 1 o'clock on the main dial) are quite clean and from there the digital artefacts start to increase.
The 4mm banana CV input is designed for signals from sources such as Modular Synths (typical 5 to 10V p-to-p levels) - the response is not 1V/Oct for sure! I can supply Interface Cables if required.
EQ: Low and High cut filtering (identical to on the PEQ) follows the Delay core - tonally shaping the signals and resulting feedback behavior.
Output Section: The main output comes from a mix of Dry and Delayed (Wet) signals. There is also an output of just the Delayed signal which is normalized to the Feedback input - you can insert further external processing here to alter feedback behaviors.
Input - Mono balanced 1/4" Jack - impedance 20k Ohms
Outputs - Mono Impedance-balanced 1/4" Jack - impedance 100 Ohms
CV - 4mm Banana - impedance 100k Ohms
Power - 12V DC 300mA supply, centre-positive, 2.1mm connector.
(worldwide 90-240VAC wall-wart provided with interchangeable mains plug adapters)
The PTDelay is enclosed in a custom aluminium case (based on the Modular line) with PCB material front and side panels. It is a 'module' so will happily slot into the Powered Frame.
Dimensions approx 5.25" x 5" x 3.5"