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Author Topic: B200s hum  (Read 689 times)

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duecemfhatchet

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B200s hum
« on: Time Format »

I have a B200s power amp that has a extremely loud buzz or hum. It has steadily gotten louder to the point of almost being unusable. Any ideas where to start?
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Duece

MarshallJMP

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Re: B200s hum
« Reply #1 on: Time Format »

I would start with the big caps in the power supply. It could also be that one of the transistor is drawing to much current. Do you have DC voltage on the output?
Do you have hum on both channels?
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duecemfhatchet

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Re: B200s hum
« Reply #2 on: Time Format »

Yes it is in both channels and no DC voltage at outputs.
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Duece

MarshallJMP

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Re: B200s hum
« Reply #3 on: Time Format »

In that case I would suspect a faulty filter cap.
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