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Old 22nd April 2006, 07:12 AM   #1
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Default yamaha amp scratching sound

there is a problem in my yamaha amp.
it has a sound but there is scratching sound over it.even the volume control is in minimum level.
oppps!!!there is another prob.,the first time i press the power button,there is a voltage surge-like sound hiting the speakers.
any suggestions would be greatly appreciated.
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Old 22nd April 2006, 09:06 AM   #2
Netlist is offline Netlist  Belgium
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What type# has your amp?

/Hugo
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Old 22nd April 2006, 09:43 AM   #3
clem_o is offline clem_o  Philippines
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Hi -

"surge" sound on turn-on may mean that your amplifier is giving out a DC offset at its speaker terminals. Take a VOM and measure. A normal amp should have pretty close to zero DC volts, a few mV to a few tens of mV offset should be ok.

Scratchy sound could be bad potentiometers, bad switches, or bad transistors (usually in the amplifier's front-end, if discrete)...

Netlist is right - the model# of your amp would provide some with the knowledge of exactly what kind of amplifier design your unit has, and could give a better idea of the problem...

Cheers!
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