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Old 16th January 2013, 03:30 PM   #1
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Join Date: Feb 2012
Default Strange hissing audible NOISE on amplifiers Right Channel output

Recently I bought a high end stereo amplifier from the ES series made by Sony in the 80's: the sony TA-N55 ES weighing 10Kg. After connecting it to the speakers I turned it on and noticed rightaway an audible NOISE coming out of the right channel which starts loud then goes lower but remains audible and irritating. Music through the left channel sounds kristal clear and loud without any noise but the right channel's output sounds low in volumme and there is lots of noise/hiss. Even when no music is connected to the RCA connectors the amp still feeds the hiss noise on the right channel.

What's wrong with this amplifiers Right output channel?

I've found a service manual for the sony 55 ES but don't know what part I should be replacing.
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Old 16th January 2013, 04:34 PM   #2
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Join Date: Jan 2011
Location: Fosser, Aurskog-Holand, Akershus, Norway.
Leaking capacitor or a transistor singing it's last walz.

'Would be the shortform answer.

As it varies with time, it is possible to use coolspray to find the defective component.
Turn it on, let it warm up (Hiss is low) and then blow some coolspray at one component after the other. Waiting some seconds between each component.
When the hissing is increasing again, You have found the defective component.
Let the amp heat up again, (low hiss again) and pinpoint the coolspray directly to the last component you blowed on when the hissing came. If the hissing returns again, You can be quite sure.
Change it and you should be good.

Was the bit more full answer.

Good luck.
Sooner or later you end up with TANDBERG
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Old 22nd January 2013, 11:42 PM   #3
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Join Date: Feb 2012
Thanks Tandbergeren! I will try that. How does coolspray look like? do you have a picture of such a tool? I guesse I would need one with a focus narrow enough to isolate and spray only one ELKO at a time. Indeed when the amp heats up the hissing goes lower. so your guesse is that when the ELKO cools down the hissing will get higher in volume right?

Thanks agian sofar!
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Old 22nd January 2013, 11:47 PM   #4
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Location: Santa Cruz, California
I had that very problem with a Sansui amplifier in the 1980s; it turned out to be a leaky transistor wandering off-bias.
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Old 23rd January 2013, 12:07 AM   #5
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Originally Posted by Eftegarie View Post
I've found a service manual for the sony 55 ES
but don't know what part I should be replacing.

You don't replace, you swop, until you find what needs replacing.
Always start at the input and work towards the output.

rgds, sreten.
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 23rd January 2013 at 12:15 AM.
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Old 23rd January 2013, 03:34 AM   #6
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Join Date: Jul 2003
Location: Dona paula, Goa
If u have a diagram, cross couple the input of one stage, for both channels. You will have understanding of which section the fault is.

This can be done by opening one end of a coupling capacitor or do it at volume control if possible.

Gajanan Phadte

Last edited by gmphadte; 23rd January 2013 at 03:36 AM. Reason: correction
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Old 23rd January 2013, 07:41 AM   #7
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Location: Athens GREECE
caution people ...this one doesnt work like that .....

the input stage of the amp is the STK 30XX series ..in the particular amp is running quite hot in most of these amplifiers i repair i always add a small heatsink on it ...

i sense the problem there

Kind regards
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Old 23rd January 2013, 09:31 AM   #8
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Join Date: Jul 2003
Location: Dona paula, Goa
STK drives both the power amplifiers and there is very little more to check. Please do not try my suggestion unless u r competant to swap the discrete power stage. U will need to swap three connections each.

Gajanan Phadte
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