lefrash Posted July 24, 2013 Share Posted July 24, 2013 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 Quote Link to comment Share on other sites More sharing options...
barkin Posted July 28, 2013 Share Posted July 28, 2013 FWIW the markings on my B9 psu say that it's a ' Honor Electronic Co Switching adaptor'. I'm guessing that your TV psu is just poorly filtered/regulated/whatever. IANAE... Quote Link to comment Share on other sites More sharing options...
xgsjx Posted July 29, 2013 Share Posted July 29, 2013 (edited) 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 July 29, 2013 by xgsjx Quote Link to comment Share on other sites More sharing options...
lefrash Posted July 29, 2013 Author Share Posted July 29, 2013 Thats good to know, as I'd likely just have bought a supermarket one which from the sounds of it, wouldnt have been much better. I'l get a half decent one then. I'l google about foir the mA rating too. Cheers Quote Link to comment Share on other sites More sharing options...
barkin Posted July 29, 2013 Share Posted July 29, 2013 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 😊 Quote Link to comment Share on other sites More sharing options...
lefrash Posted July 29, 2013 Author Share Posted July 29, 2013 Much appreciated Barkin. Would be good to know for future too, I really like the zoom so I can imagine having it for quite a few years, and I can pretty much guarantee this wont be the last PSU I leave lying aroud! haha Quote Link to comment Share on other sites More sharing options...
Kev Posted July 29, 2013 Share Posted July 29, 2013 The valve pre will mean it would certainly need at least 1A I would think, althought I would be very surprised if it needed 3A!! Try a one spot, 1200ma IIRC so should do the trick. Quote Link to comment Share on other sites More sharing options...
Kev Posted July 29, 2013 Share Posted July 29, 2013 Ah needs 12v. Look at the DC Maplins power supplies. Quote Link to comment Share on other sites More sharing options...
lefrash Posted August 7, 2013 Author Share Posted August 7, 2013 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 Quote Link to comment Share on other sites More sharing options...
barkin Posted August 7, 2013 Share Posted August 7, 2013 Thanks for the update - useful to know for when the inevitable happens, and my PSU gets left the same place as yours...! Quote Link to comment Share on other sites More sharing options...
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