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Receiver phono input too loud

Discussion in 'General Audio Discussion' started by Johndoe64, Aug 12, 2018.

  1. Johndoe64

    Johndoe64 New Member

    Messages:
    8
    I just received a Sony Str-vx250 receiver today, and I am having some problems with the phono input. When I play audio through my turntable, with the volume nob under 1 it is extremely loud and distorted. It is the same with my CD player. Both the tape monitor and Aux inputs sound fine. Is this a problem with the built in pre-amp? Thanks!
     

     

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  2. darkblue94

    darkblue94 It wasn't me. Subscriber

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    Does your turntable have a built in pre-amp? If so you would not use the phono input. Doesn't explain what's going on with the CDs unless you have plugged that device into the phono input.
     
  3. Johndoe64

    Johndoe64 New Member

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    No, my turntable does not have a built in preamp, it works fine with my other receiver. I plugged in my CD player into the phono input and it had the same loud distortion effect, it sounds fine when it is plugged into the aux input
     
    darkblue94 likes this.
  4. sqlsavior

    sqlsavior AK Subscriber Subscriber

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    One lesson learned. ;)

    Are you sure? Where did it have it plugged into on the other receiver?
     
    slimecity likes this.
  5. Johndoe64

    Johndoe64 New Member

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    I plugged it into my phono input on my old receiver, and it always worked fine
     
  6. sqlsavior

    sqlsavior AK Subscriber Subscriber

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    What turntable do you have?
     

     

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  7. Johndoe64

    Johndoe64 New Member

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    It's an old BSR turntable I've been using until I can get something nicer. Model number is GEN 6732
     
  8. E.Man

    E.Man Super Member

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    Does the Sony have a switch for moving magnet or moving coil (low output ) cartridge ?
     
  9. Johndoe64

    Johndoe64 New Member

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    No, I don't think so
     
  10. BruceRPA

    BruceRPA AK Subscriber Subscriber

    Does the needle flip over for 33/45 on one side and 78 on the other side? If yes, you have a ceramic cartridge. They have an output voltage that is very close to AUX input levels. Use AUX input instead of phono input. The EQ won’t be quite right but the volume will be close to normal. The sound quality will be kind of harsh and lacking in any sort of depth or detail. You may still be able to find a simple, inexpensive plug-in adapter to adjust for the different EQ specs. Check Parts express, MCM, Needle Doctor and similar suppliers.
     
    beat_truck and I LIKE MUSIC like this.
  11. Johndoe64

    Johndoe64 New Member

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    Thank you for the advice! I'm pretty sure my turntable has a ceramic cartridge, although it won't play 78s. It works through the Aux input, so I guess I will use that until I get a new turntable, since I was just using it to test the receiver. Thank you!
     
    Last edited: Aug 12, 2018

     

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  12. johnebravo

    johnebravo I should be practicing

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    You should never plug the CD player into the phono input: only turntables. The output level of CD player is too high, and it's possible to cause damage to the phono preamp that way.
     
  13. sqlsavior

    sqlsavior AK Subscriber Subscriber

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    Try this (assuming you don't have a ceramic cartridge): Plug the TT into the known-good Aux input. Play a record and turn the volume up until you can hear the music. If you hear music (should sound really tinny), that means the TT is still good, and the phono input on the Sony isn't right.
     
  14. Johndoe64

    Johndoe64 New Member

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    I plugged my turntable into my TV receiver AUX, and I got music without having to crank my volume up very much, so I am assuming that it has a ceramic cartridge
     
  15. Markoneswift

    Markoneswift Quartz locked n ready to rock

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    Definitely ceramic - I had the exact same thing with an old Garrard that I pulled from a console. The valve amp in the console only had one input and the turntable sounded fine through it - so did my CD player so then I thought ' Hmmm that's odd'.

    Of course I realiased that for a turntable to have the same output level as a CD player (or close ) then it must be running a ceramic cartridge. This is the situation you are in.
     
  16. the skipper

    the skipper Amateur Curmudgeon Subscriber

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    A ceramic cartridge has a much higher output level than a magnetic cartridge and will cause the phono preamp to overload.
     

     

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  17. E-Stat

    E-Stat AK Subscriber Subscriber

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    And as importantly, does not require RIAA compensation.
     
  18. toxcrusadr

    toxcrusadr AK Subscriber Subscriber

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    But why did it work OK plugged into the phono input on his other receiver? :idea:
     
    Bill Ferris likes this.
  19. Johndoe64

    Johndoe64 New Member

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    The turntable was made for the other receiver, they were part of a set sold by Montgomery Ward, so I am assuming the phono in didn't have a pre-amp.
     
    Bill Ferris likes this.
  20. toxcrusadr

    toxcrusadr AK Subscriber Subscriber

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    Ah, that makes sense.
     

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