Can you make a trip to an hardware store buy a small multimeter to monitor the battery when you use the preamp?
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Tried different cables, amps, pickups, plugged amps into different outlets, three different batteries, deoxit. I don’t know anything else to try.Sorry to be so obvious... did you check your cable(s), pickup jack, etc.? Just like rattles and buzzes on the bass, it's not always clear where the problem lies.
This is my second one - the first one I sent back made the noise on the volume, the replacement they sent makes the same noise on the volume, bass and treble.I think they would test it with a bass guitar at the manufacturer, that‘s why they ask you to try that. But they didn’t say if they would use an active or passive one. If you have both try both.
Try to turn the volume down a bit at the instrument (!), the bass guitar might deliver a hotter signal than the DB pickup.
Is there the same amount of noise if nothing (or an unconnected plug or short cable) is connected to the input?
If it has a headphone out, is the same amount of noise there too? If so, that would eliminate your amp as a potential source.
It might make sense to write down the pot and switch settings before sending it in. So they can reproduce your situation even if someone changed something by accident.
Maybe they send you a different one to check out. If that gets the noise too, it might not be this device but something to do with your other ones. (Probably the pickup since you tried different cables already.)
Good luck!
I had problems with the pots on a Headway preamp which Headway repaired, but that was different - the actual sound was cutting in and out, as well as noise. The sound does not cut out on the Gigpro, there is just static when turning the volume, bass and treble knobs.Interesting, I had the same thing happen with several Headway EDB 2's several years ago, turned out to be a defective run of pots. Headway solved the issue and I got mine replaced.