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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

543.0. "Noise" by VYGER::MCKAYRE () Wed Oct 02 1996 19:32

    Hi All
    
    I have a Michell Syncro Deck and while happy with the peformance it has
    a problem.
    
    The deck seems to be quite noisey on the bits inbetween the songs,
    crackley and lots of rumbley type sounds. This is even more noticealble
    when I tape a record. While running I can here some noise coming from
    the motors internals but it seems to run at a stable speed, could this
    noise be transmited though the drive belt and affect the needle ?
    
    So at the moment I'm thinking of replacing the motor, what I would like
    know is do I have to go to Michell to get a new motor or are supplies
    available elsewhere ?
    
    The motor runs straight off the mains with no step down transformer. Do
    I just need to calculate the speed that it runs at or are there other
    considerations ?
    
    Any thoughts would be welcome.
    
    
    Thanks
    
    Rory...
T.RTitleUserPersonal
Name		DateLines
543.1Don't shoot first..METSYS::BENNETTStraight no chaser..Wed Oct 02 1996 20:5418
    As a long-standing vinyl fan, a few things spring to mind:
    
    Record noise
    
    Turntable bearings in need of lubrication
    
    As for replacing your motor, that seems a bit drastic at the moment.
    I'm not familiar with the Michell Synchro, but its name suggests
    to me that it is a synchronous motor, where its speed is a function
    of the mains frequency, and not the current delivered.
    
    You might also check the motor and platter suspension.
    
    Speak to a reputable dealer, or phone the company.
    
    I hope that helps.
    
    John
543.2hmmmmmVYGER::MCKAYREThu Oct 03 1996 20:2722
    HI
    
    Thanks for the quick reply.
    
    I have had the deck serviced by a Michell dealer but any improvements
    were only marginal. While it was in getting serviced the dealer spoke
    to the company whose only suggestion was approximately equal to replace
    all the moving parts or even better buy their 1000 pound Gyro Deck.
    
    The reason I'm thinking of changing the motor is that I had a Dual a while
    ago and the sound quality deteriated in a similar way after the motor
    spindle got damaged plus the noise that the current Michell motor is
    making.
    
    I suppose want I realy want to know is would Michell have used an
    industry standard motor ?
    
    
    Cheers
    
    Rory...
543.343610::WATSONNot the one.Thu Oct 03 1996 21:048
    A lot of UK turntable suppliers (Linn/Rega etc) use a Phillips (I think)
    24V (50V ?) A/C motor with various bespoke mods. It sounds like Michell
    don't. I'm not sure what to advice. The phillips motor would
    occasionall make a noice of the bottom retaining 'cap' wasn't fitted
    correctly, this cap contained a pressue pad which pushed against the
    bearing of the motor. I've no idea what to say re your system though.
    
    Rik
543.4VYGER::MCKAYREFri Oct 04 1996 14:2413
    
    I'm going to have a close look (with a screwdriver) this weekend and
    see if I can sus the motor type, never know I might even find a problem
    but I doubt it. There is so little on the deck to go wrong i.e. motor,
    main bearing and suspension, presumably the arm/cart could not cause my
    problem.
    
    I will let you know the results.
    
    Cheers
    
    Rory...
543.5COMICS::FLANDERSDPas de deux - Father of twins !Fri Oct 04 1996 15:276
It is possible that a worn stylus could cause the noise problem you report,
but I would hope that any wear would have been reported when you had the 
service done

Dave
543.6WOTVAX::STONEGTemperature Drop in Downtime Winterland....Fri Oct 04 1996 15:587
    
    Or, worn bearings on the arm mounting ? allowing rumble through to the
    stylus ??
    
    Or wrong tracking weight ?
    
    Graham
543.7hmmmmmmVYGER::MCKAYREFri Oct 04 1996 19:3914
    re: -2
    
    The needle has been replaced.
    
    re: -1
    
    Worn bearings, I think everything on arm seemed tight enough but I'll
    check it again. How critical is this ?
    
    
    
    Regards
    
    Rory...
543.8WOTVAX::STONEGTemperature Drop in Downtime Winterland....Mon Oct 07 1996 14:2812
    
  >>  Worn bearings, I think everything on arm seemed tight enough but I'll
  >>  check it again. How critical is this ?
    
    Dunno ! I just thought that as the bearings in the arm have a more
    direct connection to the stylus - which is wear any vibration is being
    picked up - then it could be them...
    
    
    graham