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Alternative multiFX power supplies? possible hum issue?


lefrash
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Hi guys, I've got a zoom b9.1ut multiFX and stupidle left the power supply at a gig. Its a DC12V, 3A power pack. Now, I do have one exactly like this (for my bedroom telly) and I used it tonight at practice and there was a noticable hum from my set up. This wasnt there when plugging directly into the amp using either jack leads so I can only assume its the multiFX unit. The only thing thats changes since then was the power supply. It is the same rating as I would need (according to the zoom manual) but is there something else that the original pack may have had over the one for my telly?


The reason I ask is because I want to knw what to look out for when purchasing a replacement. (and I literalyl have no idea how it all works).


Cheers for the help

Fraser

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I had a supermarket's own brand PSU which I used on my FX. Hummed like a fridge full of wasps, bought a decent PSU & no noise.
So if you can try a different PSU, do so. It may be picking up interference.

Oh, also worth checking how many mA the PSU puts out & how many the Zoom requires. Make sure the PSU supplies more than the pedal needs. :)


Edit: I doubt the Zoom would need anywhere near 3A, more likely to be @ 300 mA, tops.

Edited by xgsjx
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Just checked my manual, and it says there that the power Requirement is 12v DC, 3A.
I'd imagine there's a bit of wriggle room factored in there, but would they specify and supply a 3A PSU if they could get away with a smaller/ cheaper one?

Could it be the 12AX7 valve pre that makes the high current PSU necessary? I don't really know - just thought I'd mention it 😊

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  • 2 weeks later...

Just to give you all a heads up, I went and purchased a 12v power supply from maplin. It was £27.99. But I have A/B'd against the one I was using temporarily and there is an instant decrease in noise. I've even noticed without even switching the zoom unit on, as soon as I plugged the old one in there was a buzz.


So in other words.... £27.99 well spent!


thanks for the advice guys.

Fraser

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