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Old 28th April 2012, 12:24 AM   #1
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Default MTX Thunder 4244

With the amp powerd up and no rca's plugged in the front left channel sounds like a am radio ..

Eerything appears to test good

Any Ideas?
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Old 28th April 2012, 12:33 AM   #2
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It sounds like it's oscillating. Do you see a thin line/trace on the speaker terminals or is it a wide, fuzzy trace?
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Old 28th April 2012, 12:38 AM   #3
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What settings should i set my scope to ??

I tryed differnt settings but it just stayed a thin line and didnt appear to move at all
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Old 28th April 2012, 12:42 AM   #4
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Will it produce audio?
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Old 28th April 2012, 12:47 AM   #5
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Yes it produces clean audio out of all 4 channels..

I went thru the settings again on my scope and with no rca's plugged in i can get a fuzzy line to appear
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Old 28th April 2012, 01:29 AM   #6
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If the trace is sharp at 5v/div, the problem is likely in the preamp section.

Does it do it regardless of the crossover/gain... settings?

Have any of the op-amps been replaced previously?

Is the bias properly set?
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