Hi,

I have change the output transistors on a Luxman L510 and I need to
set the idling current, anyone know how to do it?

Of course the correct way is to use the method in the service manual.
Lacking that, the remaining good channel is often a usable guide - adjust
the bias for about the same voltage across the emitter resistors. Usually
about 5 to 15 millivolts across each emitter resistor. My old Luxman L430
had you remove a jumper or 2 and actually measure the idle current, but
measuring across those resistors implies the same thing, and doesn't load
the circuit. (Most any DMM on a low-current range will have a certain
resistance value which can kind of screw up the very measurements you're
trying to make)

Mark Z.


"Janne" wrote in message
om...
Hi,

I have change the output transistors on a Luxman L510 and I need to
set the idling current, anyone know how to do it?

"Mark D. Zacharias" bravely wrote to "All" (11 Feb 05 06:00:35)
--- on the heady topic of " Set idling current on a Luxman L510"

MDZ From: "Mark D. Zacharias"
MDZ Xref: aeinews sci.electronics.repair:10200

MDZ Of course the correct way is to use the method in the service manual.
MDZ Lacking that, the remaining good channel is often a usable guide -
MDZ adjust the bias for about the same voltage across the emitter
MDZ resistors. Usually about 5 to 15 millivolts across each emitter
MDZ resistor. My old Luxman L430 had you remove a jumper or 2 and actually
MDZ measure the idle current, but measuring across those resistors implies
MDZ the same thing, and doesn't load the circuit. (Most any DMM on a
MDZ low-current range will have a certain resistance value which can kind
MDZ of screw up the very measurements you're trying to make)


Sometimes the inductance of the lead cables can even cause oscillation
in the emitter.

A*s*i*m*o*v

.... A stereo system is the altar to the god of music.