New Rega Fono MM causing buzz.

Discussion in 'Audio Hardware' started by Maltman, Mar 14, 2019.

  1. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    I just got a Rega Fono MM to replace the Cambridge phono pre that I was using with my P6. Had no buzz or hum issues with the Cambridge, but now have a distinct buzz at moderate volume with the Rega unit. I have checked all connections, and moved the phono pre about 18 inches from the TT. No joy. The buzz goes away when I switch to CD, but is still there when the PSU is turned off and the pre is on and amp is on the input I use for phono. Any ideas where I should be looking? Thanks.
     
  2. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Did you ground it? If so, how?
     
  3. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    I didn't ground it as I understand the ground is in the left channel cable from the TT (Rega P6). Should I be grounding it some other way?
     
  4. ae86gts

    ae86gts Active Member

    Try grounding the PSU.


    rega tt psu buzz fix
     
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  5. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    What you described is a grounding issue. You can do either of two things ;

    1. Connect a wire to your phono preamp's grounding lug nut and touch the other end on any metallic surface you can find on your turntable and amp. Eventually, you'll likely experience silence while connecting to a specific one and that'll be your answer.

    2. Use a cheater plug which is a 3-prong to 2-prong converter for your phono preamp's power cord. In some cases, the reason why these symptoms may occur is due to the ground being interrupted which would likely explain why you encountered the problem with one component but not the other.

    I've used this one successfully on a Parasound JC3 Jr which had caused the problem in my system.

    https://www.amazon.ca/dp/B00EAR9KU0/
     
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  6. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    Thanks Strat-mangler. I’ll do that and report back.
     
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  7. Danilo

    Danilo Well-Known Member

    Location:
    Milano Italy
    I had the same problem with a Rega fono mini, so I opened it and found that there is piece of metal which works as grounding wire and it was detached from the metal chassis. Soldered it and the buzz disappeared
     
  8. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    Thanks Danilo. Not sure I want to start taking the thing apart. I'll try what Strat-Mangler recommends first and go from there. If that doesn't work I'll contact the dealer or Rega.
     
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  9. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    @Strat-Mangler. Tried grounding to the amp and the TT. No joy. Although it is hard to find bare metal on either. I also tried putting the Cambridge back in and still got the buzz. The only other change I made was switching the positions of the amp and the CD player which put the amp a lot closer to the TT. Might try switching them back. Still, the buzz is only when the amp is in TT mode, no buzz on CD or any other input. The TT has always been only a few inches from the right speaker, but it was never an issue before. It has all the hallmarks of a grounding issue as you say. Frustrating. I'll try to post some pics.
     
  10. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    Also, the buzz is from both speakers, if that means anything.
     
  11. Strat-Mangler

    Strat-Mangler Forum Resident

    Location:
    Toronto
    Try putting the phono preamp away from the speakers and amp. Some are sensitive to this.
     
  12. Maltman

    Maltman Well-Known Member Thread Starter

    Location:
    Vancouver Canada
    Cheers. Will do.
     

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