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Old 22nd October 2012, 03:20 AM   #1
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Default Pioneer SA 9500 mk 1

I have a pioneer SA 9500 mk 1 and when i increase the volume to the 2nd click it start to have distortion. May i know what is the problem ? I have changed the transistor in the preamp side. I suspect is the power supply section as i increase the volume it draws higher current causing the distortion.
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Old 22nd October 2012, 06:48 PM   #2
amptech is offline amptech  Scotland
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Location: Glasgow
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Test the o/p devices... These old amps suffer from bad dry solder and cracked pcbs.... You can apply a signal into the preamp stage and bypass the preamp to check if the o/p stage is at fault...
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