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Old 6th September 2008, 06:45 PM   #11
hc167 is offline hc167  United States
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I did not change any RCA plugs/jacks. they are all original

I do not think I make mistake for the ground for the power supply unit. However, I will double check it in the next few day to verify that. actually, I think this is very good suggestion.

It is 2 pin cable. I did not change it at all

I will also try to find out if there are anywhere in the amp signal circuit ground to the chassis.



by the way, if I decide to buy a osillscope to help solving the problem. how do I do it??
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Old 7th September 2008, 07:19 AM   #12
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Default someway somehow

people think that osciloscopes make miracles !!!!!!!!

A scope will never tell you what causes the problem .It might show you a grafic about this buzz but it will never tell or help you solving this out .

After you are done with the buzz a scope , a signal generator, and a dummy load will tell you a hell of a lot of things about your amp and may be others about performance ,frequency response , speed , power, distortion and others

regards sakis
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Old 7th September 2008, 12:30 PM   #13
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>> A scope will never tell you what causes the problem

If you know how to use it, it certainly WILL help a great deal.

If you understand what you are looking at, you can tell a myriad of things about the cause and source of the noise.

It's just an expensive tool, and maybe not worth it for one or two diagnostic jobs.
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Old 8th September 2008, 05:50 PM   #14
hc167 is offline hc167  United States
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I guess I will buy a used scope at ebay. something less than $200. anyway, I have the circuit diagram for my amp. what I am going to do is trace the signal path from power amp input to the speaker output and check which stage introduce hum/buzz. then I will look in the diagram carefully and see if I can find where cause the hum. Is this sound like the right approach??
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Old 8th September 2008, 05:55 PM   #15
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Default i wonder ....

None of the tips i gave you brought any results or you havent try yet ????

Did you checked the things above ????

Is there a chance that we have a few close ups on your amp ????
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Old 8th September 2008, 06:00 PM   #16
hc167 is offline hc167  United States
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hi sakis:

I have not yet tried your tips. I was moving in the past two days. and thing are still in a mess. I will do it in the next few days. and then I will let you know. by the way, thanks a lot for your advice. I actually love my amp so much. especially, the physical appearance, and the sound of it. the sound is like each piece of air molecule standing in front of you and singing to you. but the hum sound make me feel bad
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Old 8th September 2008, 06:02 PM   #17
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Default i wish i was close

to take a look at it .....

i am very good in fault finding since i repair amps for almost 30 years and also love thse devices also ....

regards sakis
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Old 8th September 2008, 09:26 PM   #18
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Once you have your oscilloscope, be sure to check the various power supplies, maybe even before starting to check the amplifier circuits themselves.

By the way, what brand/model is this amplifier?
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Old 9th September 2008, 06:12 PM   #19
hc167 is offline hc167  United States
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It is Accuphase e202
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