Cool. I hadn’t heard of ESP before.
I’ve been hooked up with a bunch of other sites that do similar - including providing boards where one has to gather parts and enclosures and everything.
guitarpcb, guitarmania, madbean.
That reminds me. I have a shit ton of those to build.
I really like ESP's site, but a big issue I have with it is power supplies. Virtually every project seems to require low AC voltage, i.e. ±15 (or 25, or 47)VAC, which means building the power supply too. That doesn't excite me much. Plus, some of the projects I'd like to build, I'd want for a 12VDC environment. Regardless, I enjoy the theory and explanations, the debunking of audio myths, etc. that I read along the way.
The HWT is what kept me from doing a ground up. That's where the 1/2" crap starts, so to run a full 3/4" trunk I'd have to replumb the tank.
That's complicated by being in a cinderblock garage area, so that means I'd be drilling and tapconning boards and brackets to the wall there. I just said no because it wasn't broken.
You don't have to replumb all the way to the tank. Just have a look at that fitting. If you have to cut pipe at the water heater to do so, so be it--just stay at 1/2" in that area so you don't have to mess with the wall. You'd only need to replace what, 6" or so to see if that fitting is plugging? My water heater was replaced in the mid/late 1990s; by 2007 the outlet fitting was nearly a cork. That's probably the #1 spot in the hot side where hard water deposits are going to form.
Thanks to the wiring in this room (AFAICT) all of my pedals buzz. I've got one expensive one here that isn't usuable at all (Catalinbread SabbraCadabra). I thought about buying an power adapter that is really a rechargeable battery but didn't follow through. I just quit trying to use them.
It sounds like you've got ground issues, either a loop or a float. It's gotta be something relatively simple, if well-hidden. Anything audio-related should be natively well-isolated from AC mains "hum" (60Hz) so the natural frequency of the wall outlet shouldn't be an issue.
You may know some or all of the following, but for those unawares:
If the pedals and amp are 3-prong cords they
need to be in a grounded outlet. No "3-to-2" adapters, in other words. That
should eliminate any ground loop in the equipment. If not, pull the outlet cover plate and make sure there's actually a ground wire connected to the outlet. People cut corners; I know of at least one person who switched out a 2-prong for a 3 so their whatever would fit, but no ground connection was made.
If you've got a float, you need to find out where it is.
First thing to check is your patch cords, and the jacks to which they connect. Jack inspection requires disassembly, but patch cords are easily-enough tested by swapping (unless they're all bad). My home stereo has a patch cord running about 25' to my PC for use as a music source. If I unplug that cord, the stereo hums. It's because the ground circuit of the receiver's input jack is floating. That hum is exacerbated by the fact that now the L/R wires have become giant antennae for EMI. Make no mistake, it's loud. Scares the shit outta the dog. Turns out shielding only works when it's grounded on both ends. Weird, huh?
On 3-prong AC cords, assuming the outlet is grounded the obvious check is whether the ground is connected inside the case of the unit. If they use 2-prong cords, I would expect they have a polarized plug. Funny thing: polarized plugs do matter, especially in audio equipment. Equipment with polarized plugs use the neutral line as their "ground". If the outlet (or cord) isn't wired correctly, your "ground plane" is now cycling 60 times per second.
HUMMMMM. In some older houses, or ones built quickly for max profit, attention wasn't paid to which side of the outlet was hot and which was neutral. Your refrigerator, hair dryer, and TV don't care.
In all cases, you definitely want to plug any interconnected audio gear (pedal, amp, preamp) into the same circuit of the house, ideally the same outlet if possible. Otherwise you could be on two different legs of the 220V lines, which will be out of phase and potentially create an issue.
If you have a mixture of balanced (XLR) and unbalanced (RCA, 1/4" TRS, etc.) well, that's a whole 'nother discussion.