Turned up the volume and now its fooked

gifted jones · 17th December 2008, 04:25 PM

Hi all i'm new to this forum and ive got a quick question?

I turned up the volume on my Cambridge Audio A5 amp the other day (and this wasnt cranking it, the volume dial was in the middle) any way, after i turned it up the power cut immediately.

Since then the thing doesnt turn on, i tried changning the fuse on the plug adapter and that was fine.

Anyone got an idea as to what the problem is?

Thanks

GJ

prorms · 17th December 2008, 04:45 PM

did change the speaker example 4 ohms to 2 ohms
how many watts is your power amp?
are any parts burnt on the circuit board

wakibaki · 17th December 2008, 04:55 PM

Both channels gone? ...then it's something far enough back to affect both channels, probably the PSU. Look for an internal fuse or fuse on the back of the amp. Look for any thing obviously blown up (burn marks) inside. Switch it on and check if you have positive and negative power rails and report back. If you don't know how to do this, then it's an uphill struggle, go to a repairman.

w

anatech · 17th December 2008, 09:49 PM

Hi JG,
You can be well into clipping when your volume control is half way around. In any event, it should have been extremely loud.

A couple questions. What exactly was the amplifier connected to on your speaker outputs? Was there anything like mixers ahead of the amp, or just things like a tuner and CD player?

-Chris

jaycee · 17th December 2008, 09:51 PM

It's probably blown its internal fuses.. and possibly it's output transistors. These amp's have very poor heatsinking and are just not designed to be used.

You say you weren't "cranking it" but you had the dial at the middle - with normal music, that is "cranked".

17th December 2008, 04:25 PM	#1
gifted jones diyAudio Member Join Date: Dec 2008	Turned up the volume and now its fooked Hi all i'm new to this forum and ive got a quick question? I turned up the volume on my Cambridge Audio A5 amp the other day (and this wasnt cranking it, the volume dial was in the middle) any way, after i turned it up the power cut immediately. Since then the thing doesnt turn on, i tried changning the fuse on the plug adapter and that was fine. Anyone got an idea as to what the problem is? Thanks GJ

17th December 2008, 09:49 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi JG, You can be well into clipping when your volume control is half way around. In any event, it should have been extremely loud. A couple questions. What exactly was the amplifier connected to on your speaker outputs? Was there anything like mixers ahead of the amp, or just things like a tuner and CD player? -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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17th December 2008, 04:45 PM	#2
prorms diyAudio Member Join Date: Nov 2006	did change the speaker example 4 ohms to 2 ohms how many watts is your power amp? are any parts burnt on the circuit board

17th December 2008, 04:55 PM	#3
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	Both channels gone? ...then it's something far enough back to affect both channels, probably the PSU. Look for an internal fuse or fuse on the back of the amp. Look for any thing obviously blown up (burn marks) inside. Switch it on and check if you have positive and negative power rails and report back. If you don't know how to do this, then it's an uphill struggle, go to a repairman. w

17th December 2008, 09:51 PM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	It's probably blown its internal fuses.. and possibly it's output transistors. These amp's have very poor heatsinking and are just not designed to be used. You say you weren't "cranking it" but you had the dial at the middle - with normal music, that is "cranked".

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