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Sound fades (fizzles out) on one channel intermittently. Can be ok for a while then problems start. Sometimes tapping the case ogf the amplifier will fix it for a short time.

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It can be something blown, or that the frequency is to high or low on the speakers, try changing the speakers.

Posted on Apr 29, 2008

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Musical fidelity amp x-a2, one channel intermittent crackling / fading out, any ideas?! Tried swapping source and speakers... Many thanks -chris


hi,
This problem will occur when any one of the driver transistor is become faulty. You have to replace all the driver transistor of the same channel which make cracking sound . It is very difficult to tell which one is faulty. Because if you check the transistors with multimeter it will be ok. Replace all the driver transistor in that channel with same part number marked on it. The driver transistors will look like this,

ajin_g_6.jpg ok

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The center channel fades in and out intermittently. Very annoying.


It could be bad soldering? To find it trace the wires from the center channel back to the PC board and inspect it. If you see anything dodgy resolder it.

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1 Answer

Erratic volume from new turntable thru used amp


First detirmine if it is only the turntable that is causing this problem, by connecting something else to another terminal. If that works fine it will be the cartridge preamp that is causing the problem. From what you describe it sounds like an IC that is playing up.
If the other device plays up as well as the turntable, I still suspect an IC, but this time in the main pre-amp. The reason I suspect an IC is that by the sound of things both channels are playing up and therefore it has to be somepart that has both channels going in and out of it- thus IC!

May 08, 2010 | Audio Players & Recorders

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I have 3 different amps each with pretty much the same problem: One channel intermittently goes out. Power cycling sometimes recovers it temporarily. Also when I play with the input level (on the source...


I recently had a similar problem with a Technics amp having an intermittent low or no sound from the left channel. This was traced to intermittent contacts in the speaker protection relay and this may be a good place for you to start looking. Check for dry joints on the relay pc board terminals. The relays can be removed, dismantled and the contacts cleaned with a fine file and contact cleaner.

Mar 28, 2010 | Audio Players & Recorders

1 Answer

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had exactly the same problem myself, changed the balance, and the selector until Sugden suggested the relay. this did the job, and my amp is sorted. Shouldv'e changed this in the first place. Good as new. Shaun

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1 Answer

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No that's how to describe a problem, folks - with details. Using internal FM as the source is always the preferred way of troubleshooting system-wide receiver audio problems (no cables or setting in the way).

Does the sound come on immediately with power and then fade or is there a small delay while the electronics stabilize, a click and then sound that fades?

The fizzle probably means something is rapidly overheating or a capacitor is malfunctioning. If both channels do it, I'd suspect a common power supply problem. Can't help much more than that.

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1 Answer

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this set has a int/ext switch on back..and audio ic inside

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