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The Warwick Influence! J/MM Sadowsky Metro

All good. Going down the rabbit hole trying to diagnose the hum. It’s not really that bad, but I have pretty rough OCD.

The hum isn’t really present when I bypass the preamp. Only when it’s engaged is it noisy. Thanks for your input!
 
All good. Going down the rabbit hole trying to diagnose the hum. It’s not really that bad, but I have pretty rough OCD.

The hum isn’t really present when I bypass the preamp. Only when it’s engaged is it noisy. Thanks for your input!

Curious if you ever figured out the cause? I’ve got a 2022 mj4 on its way and hopefully hum noise won’t be an issue…