It’s the EHX pedals. I have a dozen pedals of all types, 9 and 12vs, and I can plug them all in using my pedal power-style adapters, and there is no signal noise (of course you get extra sound from the pedals in some cases, but this is just increased in white noise, or swirling if you have a flanger or phaser turned on or something. Totally different thing, and you can turn it off by turning the pedal off. Then when you plug in any of my EHX pedals, you get a whirling electronic pattern (kind of a highpitched current-y sound), which you can’t remove.

I don’t think I’m the only one dealing with this, as the guy at my local music shop seemed familiar with the EHX pedal noise problem as well. And it’s clearly demonstrable with any of my multi-power bars.

I suspect it’s because EHX uses the 9.6, but it could be some other issue with them as well.

Hopefully someone will have figured something out.

Thanks for the response.

Not necessarily. I started out with a non-isolated Pedal Power (the kind with the string of branching-off 9v adapters. I got the noise there.

I then got a couple of more expensive isolated ones (the kind with the metal box, and isolated plugs on the box for 9v’s, 12v, 18v. I still get the noise from EHX pedals (and none of my other pedals). What fixes the problem: using an EHX 9.6v adapter separately. As I said, I don’t like doing this because it’s a lot to plug in several 9.6 adapters which take up a lot of plug in space, too.

I don’t know about the repeated reference to “cheap products EHX is trying to now work with.” There doesn’t seem to be anything cheap-quality about any of the power sources I’ve used. And none of my other pedals (BOSS, TC Electronic, Walrus, DOD, Dunlop, Digitech) cause this problem.

Could it perhaps be to do with the miliamperage, not the 9.6v thing? I don’t know enough about electronics to know.

Thanks for the link to the Diago plug. I’ll check it out, although of course using some special piece of equipment to use a pedal might not be considered ideal by many. – edit. Wow, 33 bucks each? So 120 bucks plus taxes and shipping to use my 4 EHXs.

Here’s an audio clip of a new Key9:

https://vocaroo.com/i/s1Wcnkw1KLy7

It’s in a chain of a dozen pedals (but its the only EHX), which use 2 higher quality medal isolated power supply things. First you can hear it quiet while using the EHX brand adapter. Then you hear me unplug that and plug it into an isolated power just like the other pedals. You hear the EHX-signal noise I get with all EHX pedals.

The other EHX pedals I have: an old 24v Micro Synth (same sound as the new Key9), newish V256, and an 8-step. I also have a Silencer on the way.

I post all this info more for other people out there / consumers, who should know what they’re getting into if they have large pedal boards which they power from multi-power adapters, not for EHX staff who, considering the talent EHX has there at this decades old company, must be very familiar with this issue. And because I’d like it if someone could explain to me where the issue stems from, so I can think about fixing it / give up on fixing it.