Brax X1400 blown fets. Help. - Page 4 - diyAudio
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Old 3rd December 2012, 02:53 PM   #31
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Ok. Am going to order the fets today and pick them up. I'll order a 2525a ic, just in case.
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Old 6th December 2012, 02:47 AM   #32
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Ok, got the new fets in and gate resistors. I powered it up but notice that the gets (both audio & ps) where getting pretty warm real quick. I don't have mounted to the chassis, so i powered it right off. Will mount it with new compound between the sinks.

Oh i also switch the insulators to mica, because the one if the originals had a small tear and i didn't want to risk it.


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Old 6th December 2012, 06:57 AM   #33
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Is it possible that there was a fault in the audio section of the amp before they reversed the power connections?
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Old 6th December 2012, 12:23 PM   #34
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Don't know because once i put it back in the chassis i didn't notice any heat problems. I feed it signal and checked it with my scope.... I only got 16.6vac prior to clipping on each channel. Shouldn't i be getting more like in the 24v area? I didn't have a load on the channels.


I got 1 millivolt dc offset on the channels, when powered on with no load or/and signal. I plan on using some 2 way comps to see if it has any higher voltage or if it gets hot.

I have a 10 amp fuse on the b+ and it didn't blow it.
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Old 6th December 2012, 01:50 PM   #35
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According to the owners manual, its only 50watt x 4 at 4 ohms and 100 x 4 @2 ohms so i guess the voltage i got last night was just right for their power ratings.

Can't wait to listen to it.
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Old 11th December 2012, 12:08 AM   #36
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Tested and functions properly. Got approx 60 per ch at 4 ohms. Shipped it back to my friend. Thanks Perry and Cecil.
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