My brand new EH4800 (black with orange and red swirly Small Stone script) stopped working.

I use an MXR Mini ISO power supply. When I put the EH4800 on my pedal board initially, I removed the included battery from the Small Stone, and used a lead from my MXR Mini ISO – it worked fine (though the pedal did add some noise when engaged) – the phaser effect was nice.

I redid my pedal board, adding another MXR Mini ISO, because I needed more power jacks – and when I went to try the pedal out – the light comes on when engaged, but no sound at all – except if I turn the dial all the way I hear some clicking – disengaging the pedal, the dry signal comes through clear and clean.

I put the battery back in removing AC adapter and just went direct from my guitar into the pedal and from the pedal into the amp – and the behavior is the same.

I setup a return/replacement with the company I bought the pedal from but would like to avoid this in the future, in case I caused the issue.

I understand there is AC/DC, volts, mA, and polarity. I used 1 of the 4 9v 300mA outputs on the MXR ISO Mini power supply and I think I used one of the supplied power cables.

MXR says: Included cables use industry standard 5.5mm x 2.1mm positive barrel, negative center polarity plugs

I’m not sure if I used the new MXR Mini ISO or my existing one when I noticed the problem. I’m wondering if a cable could have done this (perhaps wrong polarity) or maybe if I used my new MXR mini ISO and it has an issue?

I’m not using the switchable 9/18v jacks on these MXR supplies yet.

Thanks for any help!

• This topic was modified 3 years, 1 month ago by specialmonkey.