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Technics su-g91 amplifier volume fluctuates

I have an Technics su-g91 amplifier that works well except the volume fluctuates intermittently. Any idea why? Thanks.

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  • masmark Feb 05, 2010

    Thanks for your feedback. No inline tuner, just jacks for one in the rear. I tested other components on the it -- CDs and a tuner but the problem seems confined to the phono, and to date, that is all I have been trying to play on this amplifier.

  • masmark Feb 05, 2010

    And in response to your question, the problem happens without me touching the volume knob --

  • masmark Feb 05, 2010

    Thanks much. But can I plug the phono jack into one of the other inputs in the back of the unit such as CD or Tuner? Did try it and it made an ugly sound!

  • masmark Feb 06, 2010

    thank you for your feedback -- much appreciated.

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Check to see if there is a lot of dust built up in the machine if so remove case and clean with air dust

Posted on Feb 06, 2010

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Usually volume fluxuations are caused by a dirty wiper contact on the volume control dial.

Here is what you can do to possibly correct the problem yourself.

1. Grasp the volume control knob and rapidly rotate it back and forth from O colume to about 40 percent volume. Do this for about 30 seconds. (fan it like you mean it) Gently push on the know for a few strokesnand then gently pull on the knob for a few strokes.

2. Rotate the knob to roughly the 40 percent volume position and fan it from 40 to about 80 percent volume repeating step one for around 30 seconds while gently pushing and pulling on the volume control knob.

3. Rotate the volume control knob to around the 75 pecent volume level and repeat above for about 30 seconds while gently pulling and pushing on the volume control knob

4. Select speakers on and off with power off several times GENTLY but for about 20 seconds.

5. Perfrom the same procedure as in step 1 with the balance control.

6. This is probably not the problem but recheck the mating of the speaker wires on the speakers and the amp.

Again volume fluxuations are caused mostly from dirty contacts. My bet is you hear lots of scratchy sounds when you rotate the volume control with the speakers on. (dead giveaway your volume control wipier arm contact is dirty)

This should make a noticeable difference.

Thanks for using Fixya! Kelly

Posted on Feb 07, 2010

  • Kelly
    Kelly Feb 07, 2010

    Just wanted to add that if you have a tape monitor button on your equalizer and it is dirty it can cause the same symptoms. Mash it several times.......



    Also fan your EQ sliders up and down on each of the freq sliders for about 15 seconds to clean off the wipers.



    Lastly pull your EQ to Amp connectors off "one at a time" and pinch the outside of the metal barrel of the EACH of the RCA connectors so that it makes a tight fit on both the EQ and AMP.



    Thanks again for using Fixya. Kelly

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Does it happen when you turn the volume control or just when playing? If it happens when you adjust the volume I would say the encoder or potentiometer is going bad. You can tell if it is an encoder by the fact that you can turn the volume knob inifinitley. If it were a poteniometer it would have a mechanical stop. If it happens while playing I would say there is a potenital cold solder joint somewhere in the amplifier stages. Does this have a built in tuner? If so does it happen while listening with the tuner or just an external input source. If it showed symptoms with one and not the other you could assume the power amplifier is good and that the preamp or buffer amps for that particular source could have a problem. Let me know..

Posted on Feb 01, 2010

  • David S. Feb 05, 2010

    That is good news, that really isolates the problem to the buffer amplifier in the phono section. Your power amp is fine thankfully. Since it is an intermittent fluctuation in volume it could be a few things. However I still stand by the cold solder joint idea. Open up the unit a see if you can trace out the phono input? I have also had problems in the past with phono jacks and impedance matching between the source and input. Worse comes to worse just use one of your other inputs. Good luck man!

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