Question from ALF, 2025-09-29 13:23:46

Hey! I'm ALF, from Italy. I found your great website looking for technical info about the KORG SD-400 Signal Delay. It works but the repetisiona are quite noisy (with some "air" blended with the original sound). I think it needs some fine tuning of the clock/bias. I opened it, founding 9 trimmers! I found the ones are responsible for the feedback amount. Could you provide me any schematics or give me any advice about this process? Many thanks in advance. Ciao for now! ALF

Response:

Unfortunately I don’t have any technical information about either the SD‑200 or SD‑400 apart from the user manuals (which aren’t very detailed). It took me about ten years after first getting one to find those! And since mine have been working I haven't tried adjusting any of the trimmers. I’ve been thinking of working out the circuit some day though.

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