Every pedal I buy has a loud buzz. Help!!

I have a pretty nice pedal board, and I'd like to work in a new fuzz tone. I have a Big Muff pi op-amp, and it works just fine, but I'd like a different variety of fuzz. But the last three fuzz pedals I bought all had the same problem, and I can't figure out what's wrong. When the pedals have come, I tried them directly from my bass too the pedal, pedal directly to the amp, and I got this enormous buzz from each different pedal. The AC is a relatively new circuit, isolated from the rest of the house, and it gives no trouble. I run my amp through it, the PA too. The first two pedals were a Earthquaker Hoof, and Death By Audio Absolute Destruction. I sent them both back. I just got a Zvex Fat Fuzz Factory, and the same thing happens. I can cut out the buzz by turning the compression and the noise gate each almost to the max, but that makes just a tiny room for any sound at all to come through. After that, it sounds kind of like a real loud buzzer on top of what otherwise would be a very useable tone. I only want the pedal for playing live, and I don't care if it has a little noise. I'm not a freak about noise, but this is unworkable. But I'm starting to think perhaps the problem was not in the pedals all along, and I can't figure out what it could be. My cables are fine. All my other pedals work fine, and there is nothing unusual about the bass. There is no interference from lights that I can find. The guitarist in the band has tons of pedals, and all his work fine in the room.
 
The bass is just stock off the shelf, no particular extra shielding, but it gives no buzz when used with all the rest of my pedals
Fuzz takes a little and makes a lot. If your bass is pulling in a little tiny bit of noise a fuzz pedal will exploit it. If you pull off your pickguard or other access you should be able to see into the cavity and tell if it's sheilded. If it's lined with foil or a dull, dark paint, you're probably good to look elsewhere for your issues.

Also, try the muff with a battery and see if you still get the noise. If a good battery doesn't clear the noise, you've ruled out the power supply as the culprit.
 
Fuzz takes a little and makes a lot. If your bass is pulling in a little tiny bit of noise a fuzz pedal will exploit it. If you pull off your pickguard or other access you should be able to see into the cavity and tell if it's sheilded. If it's lined with foil or a dull, dark paint, you're probably good to look elsewhere for your issues.

Also, try the muff with a battery and see if you still get the noise. If a good battery doesn't clear the noise, you've ruled out the power supply as the culprit.

The Muff works great, it's the new pedal I just bought that's the problem. I know the cavity isn't shielded, but if it's not necessary for the Muff. I didn't try the Fat Fuzz Factory with a battery, but I tried it with a generic power supply, and the One Spot that I use for my pedal board (it powers 4 other pedals on my pedal board but I tried it with just the Fat Fuzz.
 
Yes, I'll do that. It's a Fender Mustang P/J I bought just this year. Does a brand new bass from Fender need to have extra shielding added to the cavity just to run a fuzz pedal?
Depends on the circumstances and the specific model, but sometimes. I've had to shield pretty much all of my basses, but I'm hella cheap so they're all budget models.
 
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Any chance you sit your pedalboard on top of an amp instead of the floor? A long shot, but I've seen it happen. The pedal that amplifies sound is sitting on top of the noisy part of the amp, I think the transformer usually, Agedhorse may smack my hand on that statement, so I'll just go with "the noisy part". And then, as previously mentioned, try a battery to rule out power supply issues. I picked up a couple of these so I could try battery power without cracking open the pedal. Lazy or practical?

https://www.amazon.com/AUGIOTH-Batt...=9v+batter+center+negative,aps,44&sr=8-2&th=1
 
Many thanks to all who commented. I feel like a big dumb bell, but I think I have it figured out. I didn't realize that the pedal came new with a battery in it. When I took it out, and plugged in the 9v power supply, the buzz is much diminished, and manageable. A little noise on stage doesn't bother me, although I may go through the steps to put the shielding in the cavity of the bass, just to see if I can get rid of what's left of the buzz. I love this forum!