The Mad Professor Deep Blue Delay is regarded as one of the best PT2399 based delays out there (with the price tag to match that reputation). It’s a warm and natural sounding circuit with an analog direct signal path (aka, no buffers), and plays nice with distortion boxes as well. I’ve labeled IC1 as a TL072 as it’s what you most likely have in your parts drawer, but the originals have either OP275 or AD712 for what it’s worth. Pots can be board-mounted from the solder side of the board using right angle PCB mount pots.
