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Old 27th March 2011, 06:11 AM   #1
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Default 2sc5200 and 2sa1943?

I have just replaced two pairs of Toshiba's 2SC5200 and 2SA1943 Transistors in a amp module in a power DJ speaker, After doing so the amp now hums and the transistors get extremely hot. What could be causing this? Could it be I have been sold fake transistors?


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Old 27th March 2011, 07:26 AM   #2
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lot of fators to be considered, check the other parts esp caps, diodes and trannies.
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Old 27th March 2011, 08:08 AM   #3
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Blown OP's, usually = blown drivers as well.
Hum is loaded down power supply ???
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Old 27th March 2011, 08:46 AM   #4
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back off the output bias current to zero.
plug in the amp via a bulb tester to the mains.
Tell us if the bulb lights up.
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