• RE: hum with balanced connection - richardcooper2k 14:02:32 02/15/09 (7)
  In Reply to: RE: hum with balanced connection posted by horny on February 15, 2009 at 01:19:40

  the reason it is louder is because the yellow wire is a centre tap on the secondary winding so you get half the signal between this and either of the other wires. compared to accross the orange and blue where you get the full available signal. why the phono isn't connected to orange and blue rather than yellow and orange i'm not sure
  
  have you tryed disconecting the phono plugs while you try the balanced connection ? - i'm not sure wether you can have them both connected at once without creating ground loop problems if the phono earths are connected to chassis earth (which i think some people have found they don't like the sound of anyway)
  
  otherwise check your solder joints and look at the earthing
  
  i don't actualy have any experience of this as i havn't tried balanced connections
  
  

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  • RE: hum with balanced connection - Exorcist 19:12:53 02/15/09 (3)
    In Reply to: RE: hum with balanced connection posted by richardcooper2k on February 15, 2009 at 14:02:32

    i have some bad 5687s with serious microphonic effect, this may be a try to replace them
    i use the full transformer output (hot and cold as ground) with the low gain Shinri, it has better dynamic!
    
    

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    • RE: hum with balanced connection - horny 22:52:43 02/15/09 (2)
      In Reply to: RE: hum with balanced connection posted by Exorcist on February 15, 2009 at 19:12:53

      did you use the orange and the bleu wire then?
      
      
      

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      • RE: hum with balanced connection - Exorcist 23:08:52 02/15/09 (1)
        In Reply to: RE: hum with balanced connection posted by horny on February 15, 2009 at 22:52:43

        This is a TRANS 027/03AN, the connection:
        red-hot-signal RCA
        white-central tap-not-connected/floating
        blue-cold-ground RCA
        
        
        

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        • RE: hum with balanced connection - horny 23:23:43 02/15/09 (0)
          In Reply to: RE: hum with balanced connection posted by Exorcist on February 15, 2009 at 23:08:52

          I have the c core outputs
          they have orange yello and bleu wires
          I never get a complete manual with the amp
          the kit came in 3 parts and i stll waiting a half year on the back plate's....
          So i dont now if there more information in the manual about the balanced connection the info i got is from internet.
          
          

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  • RE: hum with balanced connection - horny 14:24:50 02/15/09 (2)
    In Reply to: RE: hum with balanced connection posted by richardcooper2k on February 15, 2009 at 14:02:32

    hello
    Thanks. So the yello is the centertap?
    the manual say indeed orange to the middel pin of the rca and yello to
    the ground of the outer ring
    and if you use xlr yello on pin 1
    orange on pin 2
    and the bleu wire on pin 3
    
    the connection of a typical xlr conector is
    pin 1 shield
    pin 2 hot
    pin 3 cold
    did i wire it the right way then?
    
    i did not try only the xlr connected.
    The rca's are also connected to the wire but there are no plugs in when i try the amps i think this is not a problem.
    
    

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    • RE: hum with balanced connection - richardcooper2k 15:36:33 02/15/09 (1)
      In Reply to: RE: hum with balanced connection posted by horny on February 15, 2009 at 14:24:50

      those connections look right to me but like i said i've not tried balanced connections myself
      
      is the ground on your phono sockets connected to any other ground ? this could create problems. amps with both types of outputs usually have a switch. there will be a reason for this. and your symtoms sound typical of an earth issue
      
      
      

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      • RE: hum with balanced connection - horny 22:42:10 02/15/09 (0)
        In Reply to: RE: hum with balanced connection posted by richardcooper2k on February 15, 2009 at 15:36:33

        no the phono sockets are not connected to another ground.
        
        

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• RE: hum with balanced connection - horny 10:11:29 02/15/09 (1)
  In Reply to: RE: hum with balanced connection posted by horny on February 15, 2009 at 01:19:40

  Today i tryed different things but the humm is still there.
  My preamp is also very microphonic when i use the balanced output when i touch it i hear it trough my speakers.
  And when i play some music only at low volume one speaker go's beeping like you hold a microphone before it
  it is just microphonic feedback!!
  I have no trouble with the rca output
  are here also balanced users?
  
  
  
  

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  • RE: hum with balanced connection - richardcooper2k 10:02:03 02/16/09 (0)
    In Reply to: RE: hum with balanced connection posted by horny on February 15, 2009 at 10:11:29

    hi horny i just remembered having a similar problem to the one you describe in a different situation
    
    it happened when i changed my tonearm. when i put the new tonearm on and turned the volume up to normal (loudish) levels my speakers started bleeping and the cones flapping. there seemed to be some kind of resonant interaction between the different components in the system.
    
    at the time i was using L3 phono and pre with a kit one. but i had just built the monos and when i put them in the system instead of the kit one, the problem went away.
    
    prehaps someone else can explain what exactly was going on ? it might help solve your problem
    
    

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