Description
The Mad Professor Deep Blue Delay earns its place on a board by staying out of the way of your core tone. Its direct signal runs through short, analog amplifier stages with zero filtering, so as long as you keep input levels in range, what goes in comes out clean and uncolored. There’s no noise reduction circuitry either, which means the echo tails decay naturally instead of getting clipped short — closer to the feel of a vintage tape unit than a sterile digital repeat.
Where the DBD really shows its design intent is with dirty tones. Delays notoriously fall apart in front of distortion, but this one was tuned specifically to hold together there, with filtering on the echo signal that lets you push extreme settings without harshness or interference. Run it before or after your dirt for different flavors, or keep things simple on a clean channel where the bandwidth and repeat behavior have even more room to breathe.
Control-wise, it’s kept deliberately minimal: Delay Time, Delay Level, and Repeat. Past 120ms, repeats are voiced so they still sound musical even when they’re not landing exactly on the beat — useful for that wash-of-ambience vibe rather than tight rhythmic slap-back.
- Delay time: ~25ms to 450ms
- Signal to noise ratio: 80dB
- Input impedance: 180K Ohms / Output drive: 10K Ohms
- Max input: 2V peak, 650mV rms
- Current draw: 25-32mA depending on setting
- Voltage range: 8V-15V (below 7.5V, delay signal mutes)
- 1/4″ Switchcraft I/O, 2.1mm power jack
- True bypass with grounded input when bypassed
- Compact enclosure: 69mm W x 111mm L x 50mm H
This unit is an open box demo — used for display, photography, or quality-checked upon opening. Fully functional and backed by full warranty.
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