Question MC into MM phono stage and amp on max volume...OK?

Discussion in 'Hi-Fi Stereo Systems & Separates' started by DT79, Feb 18, 2018.

  1. DT79

    DT79
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    Hi,

    I’ve just bought a Clearaudio Performance DC turntable (with Concept MC cartridge). My phono pre-amp is MM or high output MC only (and the Concept MC is low output), so I need to get a step-up transformer.

    However once I got it all set up I thought I’d give it a bash through the phono pre-amp, so I set the high gain setting on the phono pre and I got a very quiet sound from my active speakers. By maxing the volume on the active speakers I get an acceptable volume output, and it sounds rather fine.

    Am I OK to doing this until the SUT comes? I just want to be sure I’m not going damage the cartridge or anything else.

    Cheers!
     
  2. noiseboy72

    noiseboy72
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    You won't damage anything - unless you forget to turn it down before selecting another input! In the case of the cartridge, the transformer will make it work slightly harder, as step up will reduce the impedance slightly and this increases the load on the cartridge. This is nothing to worry about, as they are designed with this in mind.
     
  3. DT79

    DT79
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    Thanks, that’s great, just what I was hoping to hear! Luckily my speakers have an independent volume setting per input, so no danger there, until the SUT arrives!
     
  4. dannnielll

    dannnielll
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    The volume control is not like the trottle on a motorbike. .. all it does is to allow more of the signal through from the front end to the amplifier proper. The amplifier has a fixed maximum gain and the volume knob just feeds more of the signal voltage into it.
    When you get your matching transformer, it will increase the voltage from the cartridge, provide a proper load to the cartridge , so the frequency response is correct and because the voltage going into the amplifier is now larger, the amplifier noise will be reduced... So a win win win situation.
     
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  5. Deleted member 781788

    Deleted member 781788
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    The MM input is of a high impedance nature (few tens of kilo-ohms), MC needs a proper loading impedance (much lower, sometimes specific to the cartridge make/model), as was discussed in lengths in another topic.
    Needless to say, you won't damage anything, noise would be higher, and the best sound quality may not be achieved this way, however:
    Hey - "if it sounds good to you, that's all that matters."
     
    Last edited by a moderator: Feb 19, 2018
  6. Deleted member 781788

    Deleted member 781788
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    I wonder . . . .
     
  7. DT79

    DT79
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    Thanks. I have a step up transformer on order already, I was just too impatient not to try out my new TT! It really does sound good, so I’m very excited about what it’s going to sound like when it’s ‘properly‘ hooked up!
     
  8. Deleted member 781788

    Deleted member 781788
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    Good for you.
    A good transformer is better than any headamp.
     
  9. dannnielll

    dannnielll
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    All analogies are suspect and breakdown however in the case of a true class A amplifier is absolutely correct. it loses correctness the more class B the amplifer is.... it was intended more as reassurance4
     
  10. dannnielll

    dannnielll
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    ..and a good cd player or digital stream is better... but best not go there !!!
     
  11. Khazul

    Khazul
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    Poking the hornets nest again I see? ;)

    I'm surprised you never mention the real differences:
    Vinyl makes for better frisbies (larger and so more to grab hold of) whereas CD, DVDs etc make for better beer mats.
     
  12. dannnielll

    dannnielll
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    And reel to reel tapes , the new standard for audiophiles, make the worst frisees, with all the brown tape billowing off them.....
     

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