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KEF 103-3 Power Supply input voltage

 
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jagster
Junior Contributor 10+


Joined: 11 Feb 2014
Posts: 12

PostPosted: Tue Feb 11, 2014 6:57 pm    Post subject: KEF 103-3 Power Supply input voltage Reply with quote

Old stuff, and need technical information. The power supply was missing for the Kube, and I need some historian who can recall what the power supply had in the way of output voltage to feed the Kube, and whether it was AC or DC. I have numerous power supplies for donors, of various voltages, even some with DC output. I don't want to give the Kube the wrong voltage, as these are very hard to come by. I understand that Andrew was one of the engineers back then, and I hope he is on the site at some point. In the alternative, if some good soul would just unplug his from the wall and read the specification on the power supply, that would give me a head start. Many thanks in advance. Ron A PM would be great.
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speakerguru
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Joined: 18 Nov 2005
Posts: 954
Location: Green Hut, Tovil

PostPosted: Wed Feb 12, 2014 7:33 pm    Post subject: Reply with quote

18V ac

There are +15 and -15V regulators inside the small Kubes so the ac voltage input is not too critical. If you go too low than they will not regulate. If you go too high the regulators may get too hot and shut down.

I think the external "wall wart" was a 18-0-18 a.c. transformer. I only have a very early 102 KUBE with an internal mains transformer so I can't do any checking for you.
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jagster
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Joined: 11 Feb 2014
Posts: 12

PostPosted: Sat Mar 29, 2014 9:01 pm    Post subject: Power Supply for the KEF 103-3 Kube Reply with quote

The good news is my Kube now works as designed. Thanks to an excellent electronics technician that happens to be a friend, he found the correct 'pins' on the DIN connector and connected my 18 volt power supply, 'wall wart' to some, and we were in business. The PS is a very common 18 volt variety that can be found on Ebay for around $6 USD. First, discovering the speakers and stands at a flea market, then discovering the need for the correct Kube, then the need for the power supply has been quite a trip. Now to test my acquisition with the Kube connected, and see what these speakers have. Without the Kube, they do sound a little 'thin' on the bottom end, and Asian 'honkey' in the midrange. We shall see. I am not a loud rock fan, and enjoy easy listening and classical with some jazz, so I am hoping they will be great. A big round of thanks to all who have helped me in my quest. Speaker Talk and HiFi Loudspeakers shall remain favorite sites for info and warm chat.
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