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Caimbridge audio amp right channel always dies

Hi All, I have a Cambridge audio 540a V2 amp and Tannoy V4 FS speakers. Music from the speaker connected to the right channel at intermittent times will begin to crackle a little bit... this will then progress to the music cutting out and back in again... and on some occasions the music dies in that speaker all together. On some occasions it will work fine for a whole day. I have tried all I can think of - by process of elmination Im certain its not - wires (speaker or computer) - speakers - computer/software or music format.. I dont think its power supply related as this set up worked for years in my house before i had any problems. I can only think that it must be something with the amp. I have also borrowed my friends completely different amp - and do not get any problems when I use that. The problem is that I have taken it back to the shop I bought it at now and they are saying they have tested it twice and cant detect the problem. Could anyone advise if it is likely to be the amp and if so any ideas on what is wrong with it? Transistor problem maybe? Thanks.

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Stereo amps are two mono amps put together. So if you have a bad channel then you also have a good channel to compare it with. I suspect you have a faulty transistor. You can test it by proding the channels with a pen or your finger - touching plastic only parts. The two channels should buzz. If buzzs in the left then if you touch it in the right it should do the same. An alteration or change in the sound in the right and you have found the faulty part.
It's nothing to do with the power supply section so keep away from that!

Posted on Dec 16, 2012


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SOURCE: Technics SU-V2 keeps cutting out

An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).

Posted on Jan 21, 2008

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SOURCE: need manual for ra 840bx4 & wattage output when remote speakers?

Lets try the simple stuff first. This whole problem could be caused by a dirty switch contact. Pick up some electronics cleaner from a local electronics shop and spray the switch (from the inside of the unit). Work the switch on/off a number of times then respray one more time. That should clean out any dirt that is there. Try the unit again and hopefully the problem is resolved. If not, then the switch itself may need to be replaced. When you get the cleaner, get one that contains a lubricant as well. This will help to prevent the problem from coming back again.


Posted on Jun 22, 2009

  • 1 Answer

SOURCE: no audio - Pioneer Amplifier A-Z370

I experienced something similar.

Symptom: After use the sound cuts out together with a mechanical click (relay sound). Turning off and waiting a bit before powering on, tends to 'fix' it, but the sound cuts out in the same way after a while.

The click led me to the little relay board inside. Inspection of the solder joints showed that a few were 'broken' ("cold soldered"). This was right below a high-wattage resistor, possibly the cause of the stress causing these random disconnects.

Fix: Resolder the joints.

Posted on Jun 30, 2009

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SOURCE: Cambridge A5 Amp, only one speaker works when phono selected

If both speakers work okay on other inputs .Then cable from pre-amp to amp and main amp are okay. If phone RCA jacks go directly to electronics board .Then its possible solder on phono jacks need to be resoldered or other connections in that section.If unit needs repair you can also purchase a phono preamp from radioshack hook up your and use it on other good inputs such as CD etc..Please note PHONO inputs are only for turntables .If a non turntable input such as CD,TAPE,TV Etc is used on PHONE .Then you will overdrive this input .

Posted on Jul 21, 2009

  • 24 Answers

SOURCE: NAD 3020a crackle in right channel regardless of volume.

more than likely you have a bad transisitor on that side and the frequincey is distorted there's not much you can do except take it back if it's new or take it apart and check for the bad part but if you do that you had better know what your doing!! it may be just 12 volts but thru an amp it's a nasty shock

Posted on Jul 26, 2009

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