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Old 30th July 2012, 04:32 AM   #31
Arx is offline Arx  Canada
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Generally, as long as it's aluminum and your voltage is reasonable.
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Old 30th July 2012, 05:31 AM   #32
weiyan is offline weiyan  Hong Kong
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Quote:
Originally Posted by Arx View Post
Generally, as long as it's aluminum and your voltage is reasonable.
Thak you. They are using aluminum chassis. So, Sticking the chip to bottom of chassis no more heat sink required.

The a/c supply is 27V *2, is this voltage reasonable?

Last edited by weiyan; 30th July 2012 at 05:36 AM.
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Old 30th July 2012, 03:24 PM   #33
Arx is offline Arx  Canada
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if that's 27VAC x 2 then it's a bit high, and it'll run pretty warm (and you'll have to stick to 8 ohm speakers). You'll have to give it a test run to see. I ran some 3875s on 25VAC secondaries, and it did get quite warm, though not enough to be a problem on the chassis I was using. Currently I'm running mine on a pair of 14.4V transformers, and it doesn't even get warm enough to feel it.

It that's 27VDC per rail, it should be no problem.
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Old 30th July 2012, 03:45 PM   #34
macboy is offline macboy  Canada
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Quote:
Originally Posted by weiyan View Post
Thak you. They are using aluminum chassis. So, Sticking the chip to bottom of chassis no more heat sink required.

The a/c supply is 27V *2, is this voltage reasonable?
Don't forget that the chip's tab (on non-insulated versions) is at -V supply potential, not ground. You need to electrically isolate the chip from the chassis (or any heatsink) using appropriate measures, like silicone or mica insulating washers and plastic mounting screws or bushings.
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