Help needed -Electrocompaniet EC4.7 preamp

[SorenP]

Hi ! This is my first post, so please forgive me if I violate any rules..

I'm about to repair an Electrocompaniet EC4.7 preamp. I have the theoretical and practical skills to do the job. But I have no service manual !! The ALPS motorized volume pot i scratchy. The replacement of the pot seems to be a simple soldering job. But the original pot is a non standard, hard to get, (low value), 2x5k version . Do any of you wise people know if this is a standard volume circuit (input at the "top" pin, output at the wiper and the "bottom" terminal is GND) ? or is it a more exotic circuit were the ohmic value is critical ? The amp is DC coupled, so I wonder if the low ohmic value was chosen to limit the impact of bias currernts in the following amplifier stage...

Best regards

SorenP

[Mooly]

Hard to give absolute advice without seeing so I would suggest the following.

First measure to see if there is any tiny DC voltage across the pot... just for curiosity.

If the pot is wired conventionally it should be easy to see. Or it may be part of an "active" attenuator in which case the value could be more critical.

Look and see what devices the pot acts on. I suspect they will be FET's as the thing is DC coupled. If so there is no bias current issue. Could they be opamps (FET) ? Still no issue though.

5K sounds a low value so suggests a custom part maybe.

Maybe post some detailed close up pictures...