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Old 7th June 2010, 12:48 PM   #1
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Default big mosfet wire mixup...

Being the incredibly adept retard that I am, I mistakenly mixed up the wiring that goes to one of the two mig mosfets in my Gamut D200 mrkII amp. There are 3 wires going to it...a blue, red and brown (which has a resistor or something connected inline). I accidentally (retard comes in at this point) reversed the red and brown. Could I have damaged the mosfet? The amp had a relay burned out on the CB, which I just replaced. When I powered it up...with no source input...that side of the amp had a 1V output. The other side was 0v. After connecting source and speakers...no sound was heard. Turned everything off. THEN realized mistake. I fixed the mixup...and now the amp immediately blows a fuse when turned on. I checked the transistors on the CB (mje340 and 350's) when I was troubleshooting the initial relay problem and they showed normal response. Any ideas. I
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Old 7th June 2010, 01:11 PM   #2
Nrik is offline Nrik  Denmark
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Your MOSFET is probably gone.
To verify disconnect it and measure ohms between drain and source in both directions (where the blue and red goes). If the ohms are close to 0 ohms it is dead.
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Old 7th June 2010, 01:25 PM   #3
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Its possible the complimentary MOSFET has gone as well.
Check it before replacing the other one.
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Old 7th June 2010, 02:39 PM   #4
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Any idea where I could buy these?? I'm looking but no luck. Assuming of course if they are blown.
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Old 7th June 2010, 02:40 PM   #5
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BUZ900X4S160V32A500WSOT227BUZ900X4S
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Old 7th June 2010, 07:38 PM   #6
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Default Buz900x4s160v32a500wsot227buz900x4s

Is this the markings on the transistors? BUZ900X4S160V32A500WSOT227BUZ900X4S

I believe it is an SOT227 case.

Sam
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Old 7th June 2010, 07:50 PM   #7
Nrik is offline Nrik  Denmark
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Yes - Gamut uses SOT227 MOSFETs
Read the text on the Mosfet, then google.
Otherwise Digikey have some Ixys that might do the trick.
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Old 7th June 2010, 09:34 PM   #8
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thanks guys...I will check and post soon...
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Old 8th June 2010, 12:50 PM   #9
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Default Big mosfet

Does the big mosfet have any part numbers on it?

sam
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Old 30th June 2010, 01:51 PM   #10
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Say, aptquark did you ever get the Gamut D200 fixed and did you find the
large sot227 mosfets for the outputs?
I've got a friend with the same problem with his D200 and he doesn't have the coins to send it to the factory for repair.
I'll try to help him repair it if we can get some more info on the amp.

thanks,

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