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MTX TA81001
MTX TA81001
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Old 10th June 2012, 06:31 AM   #1
mike49504 is offline mike49504  United States
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Default MTX TA81001

I replaced the power supply fets in this amp..

Amp powers up and idles fine..

But i get very low distorted output almost can thear it..


Amp is producing rail voltage and + - regulated voltegs any ideas?
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Old 11th June 2012, 12:46 AM   #2
Perry Babin is offline Perry Babin  United States
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Did you try bypassing the preamp board?
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Old 13th June 2012, 03:28 AM   #3
mike49504 is offline mike49504  United States
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Yes tryed bypassing it and also tryed a different preampboard from another working 81001 problem is still there
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Old 13th June 2012, 04:17 AM   #4
Perry Babin is offline Perry Babin  United States
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Is the audio clean coming out of the op-amp near the RCA jacks?
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Old 13th June 2012, 08:37 PM   #5
mike49504 is offline mike49504  United States
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I have audio on Pins 1,5,6,7,8 on the op-amp near the rca jacks
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Old 14th June 2012, 09:27 PM   #6
mike49504 is offline mike49504  United States
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any ideas?
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Old 15th June 2012, 04:42 AM   #7
Perry Babin is offline Perry Babin  United States
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Is the audio clean at the input to the class D amp (at the two electrolytic caps)?
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Old 15th June 2012, 08:33 PM   #8
mike49504 is offline mike49504  United States
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Which 2 caps are you refering to ?
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Old 16th June 2012, 02:52 AM   #9
Perry Babin is offline Perry Babin  United States
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The two large SMD capacitors.

It would have saved time if you would have checked all of the electrolytic caps in the area.
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Old 16th June 2012, 03:15 AM   #10
mike49504 is offline mike49504  United States
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I have clean audio on the 2 large smd caps
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