I’ve owned and do own a lot of vintage synths. I’ve never had any major issues with noise coming through when there’s no sound. or being audible while making other sounds. one exception would be when the transformer is starting to give an audible hum. but that’s not noise really…

my guess would be it has some sort of issue. sounds like the seller didn’t disclose that. if you have nearby synth repair options and the seller is willing to work with you to get them, consider that. if not, return it. getting a vintage synth which already has an unknown issue is not ideal, especially if you paid a price higher than you would’ve had you known of the issue.

that said, I have no experience with this synth. it could be that this behavior is normal. but I highly doubt it.

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