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About Mosfet

Hi Audiogonians, Merry Christmas.

I got some questions about MOSFET.

First I would like to know how can one damages a MOSFET? Can wrong connection from powersupply kill it? Next up is how does a damaged MOSFET sounds like and how can one knows which one is dead if there are more than one in a poweramp? Finally, if there such a thing as life span of a MOSFET?

Equipment-Adcom GFA5500. Problem-One channel sounds like a weak reception radio. Cause-could be wrong connection. Can someone help me to trobleshoot this?
rainchild
bigtee
803 posts
 
Sounds more like the driver circuit than the output devices. Usually a dead mosfet is a dead mosfet. If it is shorted, it would be blowing your rail fuses. I would leave this to a trained tech.
unsound
7,329 posts
 
Sorry if this is obvious, but, did you check the fuses?
bombaywalla's avatar
bombaywalla
1,958 posts
 
Unsound,

I feel that it cannot be the fuses. If the fuse is blown, then there'll be zero (or no) output. Rainchild reports "Problem-One channel sounds like a weak reception radio".
IMHO.
unsound
7,329 posts
 
Bombaywalla, recently I blew a fuse on one channel of a stereo amp. The channel with the blown fuse continued to play music, albeit scratchy and distorted. After reversing speakers and cables, changed sources and eliminating the pre from the system, no luck. Then I checked the fuses. One new fuse, no problems.
unsound
7,329 posts
 
P.S. it was an all Mosfet amp.
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