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Old 29th July 2011, 02:48 PM   #1
Mallard is offline Mallard  Germany
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Default F5 damaged?

Hi Folks,

since yesterday the sound coming out of my F5 - B1 - CD Player combination is a bit strange. There is a pretty strong scratching especially at mid frequencies (strong woman voices).
It seems that it's independend of the volume.
Is it possible that the my F5 is damaged somewhere? I checked Offset and Bias, everythings is ok... but the sound

I have to say that I have listen quite a time at full volume of the B1.

Any idea? I can not imagine that the Mosfets got damaged but the Jfets maybe?
Has anyone had similar prolems?

Cheers,
Mallard
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Old 29th July 2011, 02:57 PM   #2
Zen Mod is offline Zen Mod  Serbia
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both channels ?

did you tried other source , or other amp with same source ?
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Old 29th July 2011, 04:46 PM   #3
Mallard is offline Mallard  Germany
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Yes, it's both channels.

Unfortunately I don't have the equipement to change everything.
I need to borrow them from some friends of mine.
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Old 29th July 2011, 05:12 PM   #4
juma is offline juma  Serbia
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Scratching might indicate damaged speakers...
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Old 29th July 2011, 05:19 PM   #5
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I had this happen recently, turned out to be a dieing electrolytic cap in the crossover... Have you measured speaker resistance to check that they are fine? Checked for DC on outputs?
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Old 30th July 2011, 05:43 PM   #6
Mallard is offline Mallard  Germany
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A general question, an output voltage of 1.8V from my CD Player should not damage my F5, wright?

So I guess I need to check my crossover-network of the speakers...
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Old 30th July 2011, 05:48 PM   #7
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Press the cone in and out with your finger and first listen for any phisical damage, i.e. scrapeing.. my speakers are over 30 years old....
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