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Old 3rd March 2011, 02:57 AM   #1
timwebb is offline timwebb  United States
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Default memphis 2000 mojo

ok i got this amp to power up fine.but plays low. i looked at the signal on the output transistors.one side has a clean signal and the other side has a distorted signal.what could cause this.
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Old 3rd March 2011, 03:42 AM   #2
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What was the problem initially?

What work have you done on it?
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Old 3rd March 2011, 03:51 AM   #3
timwebb is offline timwebb  United States
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the output section was fried.i replaced alot of transistors on the output driver card cause they were shorted.
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Old 3rd March 2011, 06:10 AM   #4
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Post a photo of the distorted waveform.
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Old 4th March 2011, 01:41 AM   #5
timwebb is offline timwebb  United States
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could it be a group of transistors?
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Old 4th March 2011, 01:51 AM   #6
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Where was this signal taken from?

What's the timebase setting?

Can you post a photo of the 'good' signal?
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Old 5th March 2011, 04:50 PM   #7
timwebb is offline timwebb  United States
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it was taken from one side of the out put transistors off the tabs.
time/div-1
volt/div-5
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Old 5th March 2011, 08:23 PM   #8
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Did you check the resistors that are connected between the emitters of the NPN and PNP driver transistors? They're typically between 1 and 4.7 ohms and often open when the amp fails.
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Old 6th March 2011, 07:36 AM   #9
timwebb is offline timwebb  United States
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yes i checked them they all read 1.1-1.4 ohms.one channel plays but is low and distorted and the other is dead.

these are the cards i have,what else should i be looking for?
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Last edited by timwebb; 6th March 2011 at 07:42 AM.
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Old 6th March 2011, 08:54 AM   #10
timwebb is offline timwebb  United States
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ok both channels work but still only plays low.it cut out when a bass line hit.
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