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Thread: Philips GP390 Ceramic cartridge NOS 1970s

  1. #31
    Join Date: Mar 2008

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    I'm inthescottishmafia.

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    Ok thanks.
    “Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”

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  2. #32
    Join Date: Oct 2011

    Location: Nothamptonshire

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    I'm Sharif.

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    Jerry I had a problem with the Thorens TP90 arm with hum using the GP390.

    It turn out to be the earthing between the shaft and bearing in the arm pillar, it was reading about 12 ohms my only conclusion was there must be some corrosion between the different metals. The only way to solve it was to adding a wire between the bearing shaft and the pillar.

    Just a thorough with no music playing and the volume turn up, does it still hum when you place your hand near the tonearm?

    Sharif.

  3. #33
    Join Date: Jan 2008

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    Quote Originally Posted by Audioflyer View Post
    Jerry I had a problem with the Thorens TP90 arm with hum using the GP390.

    It turn out to be the earthing between the shaft and bearing in the arm pillar, it was reading about 12 ohms my only conclusion was there must be some corrosion between the different metals. The only way to solve it was to adding a wire between the bearing shaft and the pillar.

    Just a thorough with no music playing and the volume turn up, does it still hum when you place your hand near the tonearm?

    Sharif.
    Thanks Sharif

    I've plugged the output of my phonostage into a Behringer DEQ2496 so I can see what is going on with the hum.

    Main hum output is tightly centred at 50Hz - so mains earthing of some sort, I guess.
    But there are also hum/buzz components 300-500Hz or so and some broader band lower level buzz in the region of 1-2KHz.

    The hum increases when the cartridge is over the platter - whether the turntable is powered up or not. Magnetic effects from the direct drive motor?

    But the main issue is the 50Hz hum - and a notch filter on the Behringer gets rid of that without noticeable effect on the music. The other noise is almost always not discernible when music is playing.
    .

  4. #34
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    thought I'd try the direct attachment doohickey rather than use photobucket ...

    Coo, it worked.
    Attached Images Attached Images
    .

  5. #35
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    Have you only got one screw holding that cartridge in?

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  6. #36
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    And there was me thinking you wouldn't notice.

    Damn vinyl setup/spares box is 80 miles away. I was lucky to have 1 screw that fitted.
    .

  7. #37
    Join Date: Feb 2008

    Location: Middlesex, UK

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    I'm Alex.

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    I have no experience of the Philips ceramic cartridge, but at the risk of being of being repetitive, I love the Philips GP range of magnetic cartridges. Hardly anyone mentions them.
    Spendorman

  8. #38
    Join Date: Feb 2013

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    Quote Originally Posted by jandl100 View Post
    thought I'd try the direct attachment doohickey rather than use photobucket ...

    Coo, it worked.
    Disgracelfully lazy... Dislike attachments

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  9. #39
    Join Date: Jan 2013

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    I'm Justin.

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    Even the head of the bolt doesn't look tightened - it is way above the headshell.

    Sorry Jerry, but...

  10. #40
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    Quote Originally Posted by spendorman View Post
    I have no experience of the Philips ceramic cartridge, but at the risk of being of being repetitive, I love the Philips GP range of magnetic cartridges. Hardly anyone mentions them.
    There's an interesting looking Philips moving coil cart on t'Bay at the moment ...

    Not set up right, though - 2 bolts is for wusses.

    .

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