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Old 23rd December 2012, 02:26 PM   #1
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Default MTX 4002

If i turn the gain or crossover pots up this amp makes the speaker flutter like crazy..

Any ideas? Maybe bad pots?
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Old 23rd December 2012, 02:48 PM   #2
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Possibly but that generally causes more of a crackle than than a flutter (assuming that the amp isn't set to low-pass).

Do you have excessive DC on the output pins of any of the op-amps?
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Old 23rd December 2012, 04:24 PM   #3
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On Pins 1 and 7 of the TL074C I get -0.16 volts So no real DC on the output pins ..

Pins 8 and 14 rest at 0.00 volts

If i turn the Pots down the DC on pins 1 and 7 drops to 0.00 volts

Also when i turn either the gain or crossover pot up with a speaker connected the amp will start drawing excessive current

Last edited by S Merlington; 23rd December 2012 at 04:33 PM.
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Old 24th December 2012, 04:32 PM   #4
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0.16v is enough to cause the amp to push the amp nearly to clipping.

What happens if you connect the shield ground to the amp ground?
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Old 24th December 2012, 05:24 PM   #5
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No change when i connect the rca shield ground to the amps ground
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Old 24th December 2012, 05:48 PM   #6
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Do any of the op-amps have more than about 0.005v difference between the two input pins for each section? Place the probes directly on the two input pins for each section.
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Old 24th December 2012, 06:13 PM   #7
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No All remain at 0.00 volts
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Old 24th December 2012, 09:33 PM   #8
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Post a photo of the inside of the amp.
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