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Old 13th May 2011, 08:55 AM   #1
timwebb is offline timwebb  United States
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Default brutus bxi 1200w

i have this amp i rebuilt the powers supply.new gate resistors drive transistors.but every time i put a fet in the power supply it goes into protect. it has 3.40 on the gate and a good signal.what could i be missing?
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Old 13th May 2011, 04:58 PM   #2
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Does it go into protect if you remove the rectifiers?
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Old 14th May 2011, 01:10 AM   #3
timwebb is offline timwebb  United States
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yes.
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Old 14th May 2011, 03:00 PM   #4
timwebb is offline timwebb  United States
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ok now it does go into protect when i put the rectifiers in .
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Old 14th May 2011, 10:34 PM   #5
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To clarify... Does it always go into protect mode (with and without the rectifiers)?

Does it remain in protect mode if you leave the amp powered up?
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Old 14th May 2011, 10:43 PM   #6
timwebb is offline timwebb  United States
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yes.it goes into protect with the rectifiers. with out them in it power up fine.
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Old 14th May 2011, 10:45 PM   #7
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Post a photo of the board so I can see exactly which amp this is.
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Old 14th May 2011, 10:55 PM   #8
timwebb is offline timwebb  United States
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Old 15th May 2011, 12:43 AM   #9
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I would suspect the two transistors in the rectangle in the attached photo. They are MMBTA42s.

I'm assuming that you've carefully checked all of the output transistors.
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File Type: jpg defectivetransistors01.jpg (216.6 KB, 38 views)
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