The jacks now typically have a plastic body, and the exterior nut is actually a hollow lug. More and more pedals are now constructed in a way that doesn't ground the circuitboard via the in and out jacks' ground connection to the enclosure. It almost sounds like an internal grounding problem, really not that different from a guitar that's improperly grounded. To your point - midrange hum, not overdrive hiss. The hum sounded like a "modified 60-Hz hum" you get from touching the tip of a plugged in guitar cable just not that low or that loud. In retrospect, I should have turned the lights off to see if the hum disappeared however, if the pedal is that sensitive to lighting and/or power, then maybe it's not for me. It was like it was picking up the fluorescent lights and humming to that, and then you had a bit of "overdrive hum" on top of that. Turning the drive higher / lower changed the hiss added to the hum "sound", but not the hum volume. Putting it into bypass mode (the pedal is true bypass), the hum stopped, as would be expected. With the guitar volume at 0, it still had the same hum - turned up to 10, it had the same hum. I was using a power supply - these units did not have batteries in them. It was a Tele with singles, into a used Sweetwater DRRI (wine and wheat). Good questions - I should have included that info.
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