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SpeakerTalk
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
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proffski
Über Contributor 1000+
Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK
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 Posted: Mon Oct 01, 2012 11:33 pm Post subject: DIY Subwoofers and Suchlike! |
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Harrys Subwoofer.
Yet another KEF PSW2500 Subwoofer rebuilt to how it should have been in the 1st place.
Equalisation changed to cater for larger cabinet and decent drivers weighing half a planet! http://s891.photobucket.com/albums/ac114/AndyGoloskof/
Awesome, some details at bottom of picture once you have clicked it! 
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I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
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audiolabtower
VIP Contributor 500+
Joined: 06 Jan 2009
Posts: 686
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| Posted: Tue Oct 02, 2012 12:02 pm Post subject: |
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| Wow, are the walls really that thick hardwood? I take it from your comments the original Kef was not too reliable... not enough heatsink or something? |
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proffski
Über Contributor 1000+
Joined: 22 Aug 2003
Posts: 1297
Location: Tewkesbury UK
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| Posted: Tue Oct 02, 2012 1:03 pm Post subject: |
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| audiolabtower wrote: | | Wow, are the walls really that thick hardwood? I take it from your comments the original Kef was not too reliable... not enough heatsink or something? |
Heatsinking was adequate, but they were dropping voltage through large resistors next to capacitors including power supply, so capacitors were cooking and dying!
One transistor was being pushed to its limits even at room temperature, yet running very hot, so way above safe operating area!
Too many issues to list but possibly the accountants got their hands on the designs before they went into production! Many suggested fixes are temporary as was KEFs! Boards same as some Celestion models.
Link: http://tinyurl.com/8w8zdpt
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I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill |
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