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Conference hips::uk_audioo

Title:You get surface noise in real life too
Notice:Let's be conformist
Moderator:GOVT02::BARKER
Created:Thu Jul 28 1988
Last Modified:Mon Jun 02 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:550
Total number of notes:3847

127.0. "Dear Marge Proops...." by YUPPY::OHAGAN (Siggi Plays Midfield) Thu Oct 05 1989 14:30

    Help!!
    
    I have an ongoing problem with my set-up which I am trying to resolve
    as cheaply as possible. I wonder whether anyone can offer suggestions
    to the cause and solution.
    
    In the evenings I tend to get interference coming through the speakers
    and/or the headphones. It is not hum or feedback but radio-ish,
    as if a foreign radio station is being picked up. I have checked
    the earths between equipment and mains etc to see if the problem
    stems from there but no joy. The only two things that have made
    any difference have been disconnecting the speaker cables from the
    amp and also the tuner from the amp.
    
    I am now at a loss as to what to do next.
    
    Mike
    
    PS My current set up is:
    
    Denon PMV300V Amp
    Dual deck
    Rotel 850 Tuner
    Tannoy spkrs with QED 79 strand cable
    Marantz 65IISE CD
    JVC cassette
T.RTitleUserPersonal
Name		DateLines
127.1Hope you don't live near Crystal Palace.....BAHTAT::SALLITTDave - @RKG & ICI, 0642432193Thu Oct 05 1989 15:5812
    Is the interference more apparent with certain sources selected?
    
    If you live near a transmitter there may not be much you can do,
    other than check that all interconnects are in good nick and correctly
    fitted, and that your amp's signal earth goes to the mains earth
    either via the turntable or direct.
    
    I know how you feel; my preamp used to pick up Radio Moscow's english
    service at night, until I sorted my interconnects and grounding
    out.
    
    Dave
127.2House For Sale42730::OHAGANSiggi Plays MidfieldFri Oct 06 1989 12:3418
    Dave,
    
    The interference is there no matter what source selected. All the
    interconnects are the ones supplied with the various equipment except
    for CD to amp which is a QED lead.
    
    Forgive my ignorance but which one is the signal earth?
    
    I live about a mile from Ally Pally which I understand still has
    a transmitter in operation. Mind I am trying without luck to sell
    my house. Interested?
    
    My next option is to borrow my brothers NAD3020E to see if that
    causes the interference to be exhibited.
    
    Mike
    
    ps My interfence is more Radio Warsaw than Moscow
127.3You're Pole-axed!RDGE23::BARNETTDWho was that masked man?Mon Oct 09 1989 12:1914
    RE.2
    
    >> My interference is more Radio Warsaw than Radio Moscow
    
    Mike,
    
    You'll have no problem getting the commentary on the game on Wednesday
    then!!
    
    Nice to see you're still alive and kicking!!
    
    Cheers,
    
    Dave.
127.4You're going to have some work on....BAHTAT::SALLITTDave - @RKG & ICI, 0642432193Mon Oct 16 1989 15:0927
    Maybe I can get a reply into this without getting "network partner
    exited" again.
    
    Signal earth is usually a small screw stud next to the phono
    connectors on the amp. The small wire along with the phonos from the 
    turntable should go there; this should be the only place where signal 
    earth and mains earth are common - in the turntable.
    
    If the turntable has only a 2-wire mains connection, then signal
    earth and mains earth never get connected, especially if all other
    components are 2-wire also. In this case, run a seperate earth wire
    back to mains earth at a socket from the stud on the amplifier.

    If after checking this you still get interference, check all
    interconnects for good connection, especially the earth or shield.
    If the standard cables are the moulded type, replace them with good
    oem cables like QED or Chord Co.
    
    Make sure cables are tidy; more specifically, don't run high level
    (power, speaker) cables parallel to low level (phono, other
    interconects) anywhere it can be avoided.
    
    If you still have problems your dealer or manufacturers may help,
    or the Post Office have a department that specialises in tracking
    down interference sources.
    
    Have fun!
127.5When In Doubt - Swap It Out!YUPPY::OHAGANSiggi Plays MidfieldThu Jan 04 1990 15:0610
    Update!
    
    I have worked around the problem of noise interference by buying
    a new amp. I purchased a Music Fidelity B1 which appears to be noise
    free. It is also a lot better sounding than my previous amp - Denon
    PMV300V.
    
    Regards
    
    Mike