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mike romancio Posted on Jun 05, 2014

Creek amplifier When playing records with the creek obh-18 the speaker flutter uncontrolably. Some sort of feed back ?

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Ioannis Konstantaras

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  • Posted on Jun 28, 2014
Ioannis Konstantaras
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It seems that you have a low Hz feedback loop between the speakers and the tonearm/stylus.
Usually it's only a visual effect and very little can be heard.
In the old times there was a "subsonic" filter in the phonostage part of the amps to cut this out.
You could try a different placement of the turntable as this phenomenon is induced by airborne vibrations and a different placement could ameliorate this interaction...

  • James Kovacs
    James Kovacs Jun 28, 2014

    SUBSONIC FEEDBACK it is. Try placing the turntable somewhere else, probably your furniture is resonating. You can also place it on a piece of rug so the vibrations do not get transmitted. Good Luck.

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1 Related Answer

Anonymous

  • 1512 Answers
  • Posted on Feb 12, 2008

SOURCE: Creek 4040 Amplifier blown some speakers ?

I would suggest not using the amp before the problem is sorted. It may damage your new speakers :)

  1. It is possible that your input selector switches may be Noisy. What happens when you operate them, does it exasperate the problem?
  2. Noisy control pots may also be contributing to the problem. taking the lid off and giving the pots and switches with decent squirt of contact cleaner lube (I use CRC2-26)
If you still have issues, is the problem there on both channels?
If it is then there may be a power regulator issue.Is there a DC offset on the left and right speaker output(check with a DVM).

You can find a schematic here.

I am happy to talk to you more about the problem. I would need to talk a bit further with you, just ask away in here.


regards
graeme

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I would suggest not using the amp before the problem is sorted. It may damage your new speakers :)
  1. It is possible that your input selector switches may be Noisy. What happens when you operate them, does it exasperate the problem?
  2. Noisy control pots may also be contributing to the problem. taking the lid off and giving the pots and switches with decent squirt of contact cleaner lube (I use CRC2-26)
If you still have issues, is the problem there on both channels?
If it is then there may be a power regulator issue.Is there a DC offset on the left and right speaker output(check with a DVM).

You can find a schematic here.

I am happy to talk to you more about the problem. I would need to talk a bit further with you, just ask away in here.


regards
graeme
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