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Old 21st February 2013, 08:58 PM   #31
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Hi Perry,

I am curious now if maybe I should test with a different speaker. The distortion is louder than the music, but maybe the speaker is defective itself. I'm not a complete noob, I swear, just throwing ideas out there is all.

As for the white noise, I am using a full range speaker, if it were running to my subs, in the trunk I might not be able to hear it.
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Old 21st February 2013, 09:22 PM   #32
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With the black probe on the amplifier's main ground terminal and the red probe on the input RCA shield, what is the DC voltage?

If it's essentially 0v, connect a jumper from the RCA shield to the amp's main ground. Does that make a difference?

Is there less noise when there is nothing plugged into the RCA jacks?
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Old 22nd February 2013, 01:36 AM   #33
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I tested both ways, the white noise is the same volume with or with out source connected.

I only read about 1.5mV between the RCA shield and the negative terminal.

I jumped the shield to the negative terminal block and the sound is the same as it is without the jumper.

To rule out the speaker, I changed it, and the same distorted sound persists.
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Old 22nd February 2013, 11:54 PM   #34
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Any other ideas? Could this be in the input section?

On a side note, R166 is discolored but tests ok at 100ohm.
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Old 23rd February 2013, 12:10 AM   #35
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Without a scope, it's going to be difficult to find the fault.
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Old 23rd February 2013, 12:24 AM   #36
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Oh, that sucks.

Do I need to spend a lot on a scope? Or will a used one with limited features work?
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Old 23rd February 2013, 12:27 AM   #37
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Do you intend to continue doing this type of work?

If not, you should pay someone to repair it. If you are going to do more repairs and want to buy a scope, you'll probably have to spend about $150-200 on a scope.
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Old 23rd February 2013, 12:29 AM   #38
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I am sure that this will not be the last amplifier I work on... If I can buy broken and repair for less than new, that Is what I choose to do... Might only be one a year. But I prefer to do as much stuff as possible on my own.. from car repairs to electronic repairs etc.
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Old 23rd February 2013, 05:39 PM   #39
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If you decide to purchase a used scope, post a link to it to get some opinions as to whether it's a good choice.
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Old 24th February 2013, 06:24 PM   #40
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I have this amp and the owner here right now... where would you like me to start checking for this distortion Perry?
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