Can you fry a gainclone ?

Buhl · 18th December 2006, 06:12 PM

Thats the question im asking my self - I had a 3875 along with some JBL control ones for a nice weekend in a summerhouse, where one of the first albums from an austrailian rock group heated up the case considerly. I noticed when one channel clearly was distorting audible. I turned it down, and it disserpered. When cranked up again short after, it was not long before it came again. Then a loud buzzing sound, and I flipped the switch. Now at home, I measure negative rail voltage (-26 volts) on the output - and the positive capacitor on the faulty channel does not decharge, when the power is shut off - as if the chip does not drain its positive rail - can it really be toasted ?
I thought it was protected from all sorts of overload ??

Cheers !
Hans

Nordic · 18th December 2006, 06:50 PM

No, its not a guaranteed failsafe.
Thermal management is literaly critical.
Also compare the two speakers on the good channel, you may have damaged one...

18th December 2006, 06:12 PM	#1
Buhl diyAudio Member Join Date: May 2002 Location: Aalborg, Denmark	Can you fry a gainclone ? Thats the question im asking my self - I had a 3875 along with some JBL control ones for a nice weekend in a summerhouse, where one of the first albums from an austrailian rock group heated up the case considerly. I noticed when one channel clearly was distorting audible. I turned it down, and it disserpered. When cranked up again short after, it was not long before it came again. Then a loud buzzing sound, and I flipped the switch. Now at home, I measure negative rail voltage (-26 volts) on the output - and the positive capacitor on the faulty channel does not decharge, when the power is shut off - as if the chip does not drain its positive rail - can it really be toasted ? I thought it was protected from all sorts of overload ?? Cheers ! Hans __________________ "Calculations? We don't need no stinkin calculations! We just make them really big!" Quote: Nelson Pass

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18th December 2006, 06:50 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	No, its not a guaranteed failsafe. Thermal management is literaly critical. Also compare the two speakers on the good channel, you may have damaged one...

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