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Old 8th January 2012, 12:39 AM   #131
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Have you carefully checked Q203 and Q206?

Have you confirmed that all of the resistors connected to those transistors are within tolerance?
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Old 8th January 2012, 01:00 AM   #132
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q203 and q206 were replaced, along with r231 r234 r235. all values verified after the last failed attempt at fixing this thing. one was open causing the waveforms to be wrong.

waveforms on the gates of all 8 fets were verified w/ my scope before i even soldered in the new fets
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Old 8th January 2012, 02:52 PM   #133
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If the IRFP250Ns weren't the originals, there's no guarantee that they'll work. I think you need to go back to the original transistors to eliminate the replacements as a possible problem.

A 3 amp supply may not be able to power this up.
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Old 8th January 2012, 03:46 PM   #134
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I cant find the originals and the supply powers it up w no output fets just fine
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Old 8th January 2012, 05:30 PM   #135
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The IRFP3415s were the originals in some of these amps and are readily available.
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Old 8th January 2012, 05:38 PM   #136
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My next move is to put the 4 remaining good fets in the left bank which includes q208 and q209 and see what happens. Good original fets that is
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Old 9th January 2012, 05:02 PM   #137
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So arrow and digikey can get them but they dont have stock. Mouser has em but theyre expensive. Anyone know of another reputable seller? Im not even gunna attempt ebay with all the counterfeit chips.
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Old 10th January 2012, 01:49 AM   #139
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thanks perry, i've never heard of octopart before
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Old 10th January 2012, 02:09 AM   #140
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It's on the DVD on the Semiconductor Datasheets page. I think I remember you ordering the tutorial.
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