F5 damaged?

Mallard · 29th July 2011, 02:48 PM

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

Zen Mod · 29th July 2011, 02:57 PM

both channels ?

did you tried other source , or other amp with same source ?

Mallard · 29th July 2011, 04:46 PM

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.

juma · 29th July 2011, 05:12 PM

Scratching might indicate damaged speakers...

digits · 29th July 2011, 05:19 PM

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?

Mallard · 30th July 2011, 05:43 PM

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...

digits · 30th July 2011, 05:48 PM

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....

29th July 2011, 02:48 PM	#1
Mallard diyAudio Member Join Date: Jan 2003 Location: Germany, Luenen	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

29th July 2011, 02:57 PM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	both channels ? did you tried other source , or other amp with same source ? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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29th July 2011, 04:46 PM	#3
Mallard diyAudio Member Join Date: Jan 2003 Location: Germany, Luenen	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.

29th July 2011, 05:12 PM	#4
juma diyAudio Member Join Date: Nov 2005 Location: Zemun	Scratching might indicate damaged speakers...

29th July 2011, 05:19 PM	#5
digits diyAudio Member Join Date: Apr 2011	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?

30th July 2011, 05:43 PM	#6
Mallard diyAudio Member Join Date: Jan 2003 Location: Germany, Luenen	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...

30th July 2011, 05:48 PM	#7
digits diyAudio Member Join Date: Apr 2011	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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