Matrix UKP1000 repair/upgrade

Williham · 10th July 2010, 04:11 PM

Hey guys,
I've got a Matrix UKP1000 PA amplifier; its getting on a bit now but I'd like to get it back up on its feet and if possible retrofit/upgrade a few of the components.
Basically what has gone wrong is that the right channel, Output B, distorts badly as soon as the volume goes up or theres a load of bass; so I'm thinking that one of the mosfets has died on me. I'm not sure what type of mosfets they are but I can take a photo of them and upload them in a little while.
So I was wondering if theres a superior equivalent that I could just replace all the mosfets with? And if anyone knows of any other mods that would be worth doing?

Cheers,
Will

nigelwright7557 · 10th July 2010, 10:42 PM

The first stop is to replace the electrolytics.

Check any pots for wear and replace as required.

Williham · 11th July 2010, 11:18 AM

The Pots seem to be ok.
There was a slight bit of rust or something on one of the 10000uF PSU caps, so I think they will be the first to go. I may have to chuck in some 20000uF Mundorfs if I can afford it, that should up the bass a bit methinks.

10th July 2010, 04:11 PM	#1
Williham diyAudio Member Join Date: Dec 2007 Location: United Kingdom	Matrix UKP1000 repair/upgrade Hey guys, I've got a Matrix UKP1000 PA amplifier; its getting on a bit now but I'd like to get it back up on its feet and if possible retrofit/upgrade a few of the components. Basically what has gone wrong is that the right channel, Output B, distorts badly as soon as the volume goes up or theres a load of bass; so I'm thinking that one of the mosfets has died on me. I'm not sure what type of mosfets they are but I can take a photo of them and upload them in a little while. So I was wondering if theres a superior equivalent that I could just replace all the mosfets with? And if anyone knows of any other mods that would be worth doing? Cheers, Will

10th July 2010, 10:42 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	The first stop is to replace the electrolytics. Check any pots for wear and replace as required. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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11th July 2010, 11:18 AM	#3
Williham diyAudio Member Join Date: Dec 2007 Location: United Kingdom	The Pots seem to be ok. There was a slight bit of rust or something on one of the 10000uF PSU caps, so I think they will be the first to go. I may have to chuck in some 20000uF Mundorfs if I can afford it, that should up the bass a bit methinks.

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