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east electronics 2nd February 2009 08:21 PM

strange feedback issue ( wiring )
come acroos this sears amplifier that i actually restore and upgrade with in the possible .....

rewiring a few things here and a few things there i realized that this amplifier features a feedback trace with a piece of wire directly from binding post in the out put connectors ( ???? )

pretty fancy i thing for a comercial korean amp .

in the outsi normaly like to keep seperated leads from the amplifier boards till the output connections also i like to twist them with another seperated lead coming from signal star ground .... so i have one twisted pair from each output to each connector ....

Question ????
what happens then to feedback trace ????previously all of these cables like rails input output feedback and so on were just simply straped on all together ....

do you thing that its ok to twist 3 cables like one signal one ground and one feedback ????

east electronics 3rd February 2009 07:18 AM

thats odd .....

kubeek 3rd February 2009 10:04 AM

I donīt understand what you are talking about. Could you explain a bit more?

east electronics 3rd February 2009 11:03 AM

what is exactly that you dont understand ????

Originally posted by kubeek
I donīt understand what you are talking about. Could you explain a bit more?

most ab class amps need feedback thats a trace that comes from the output through a resistor to the base of the second transistor of ltp stage ..... in some amps this trace comes not from the output on the pcb area but directly from the speakers connections ....

similar to this if i remember well was the Ó drive amps from kenwood that used seperated connectors to do the same thing in order to take feedback directly from the speaker connection on the speaker box

the question remains :
if twisting one signal one ground and one feedback canble will have any effect

( for example it is known that twisting the rail cables from psu board to amplifier board is a good thing to do as long as you are not twisting ground with them ........

for the output leads is the oposite ....twisting L out cable with ground and sent it from amplifier board to ouput connectors while you try to keep it as far away is possible from rail cables or Rout lead )

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