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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
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!
did you use the orange and the bleu wire then?
This is a TRANS 027/03AN, the connection:
red-hot-signal RCA
white-central tap-not-connected/floating
blue-cold-ground RCA
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.
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.
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
no the phono sockets are not connected to another ground.
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