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I have a question about the L3 line amp
i have the Signature with balanced c core
and play only with the rca output yesterday i was trying the balanced output
i opened the L3 and i solder a wire on the rca ground (yellow cable from transformer ) and connect it to the pin 1 on the balanced connector
then solder a wire to the rca hot (orange cable from the transformer) and connect this to the pin 2 of the balanced connector
I connect the bleu wire from the transformer to the middel pin 3 of the balanced connector , like shown on the manual.
is this the right way ???
And can i solder all the connectors together ? or just the ones i use?
There was no rca cable plugged in when i try the amp.
When i put on the amps i hear music but much louder than the RCA connector and a loud hum trough the music.....
i hope someone can help me with this
best regards Robert
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.
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?
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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