derailment noise/hum

[9 volts]

HEy there, I built a derailment, sounds great but when I put a fuzz(high gain) pedal in front of it I get a really loud hum is this normal or does it sound like a ground loop?

[Structo]

How are you powering the fuzz?

If using an AC adapter, take that off and try a battery.

Still hum?

You got lead dress problems on the front end.

[9 volts]

Thanks, I'm using a battery. I'll have a look at the wiring. I used a metal plastic input socket (eg not isolated from the chassis) could this create a problem? Cheers

[Structo]

Nah, if you are using a battery then you shouldn't be getting a ground loop from the pedal.

I would look at your lead dress V1.

Does this amp do this with any other pedal?

Does it hum playing straight into the amp?

What do you mean by a metal plastic input socket?

Are you talking about the input jack?

Typically the input jack is grounded to the chassis.

Do you have a schematic you can post along with pictures of the insides of the amp?