Sampson KM140 PA / mixer

[DrBingo]

looking for schematic and parts list for Samson KM140 PA/mixer. I have two of these, one of which works fine. The other is missing all knobs, and only one mic channel works. All the instrument input jacks are worn out, but I have a set coming from Samson. I anticipate more problems will appear after I replace the jacks, but maybe I will get lucky and everything will be cool ...
Samson does not have any replacement knobs for this amp. who is a good source for these small knobs? 1/4" half shaft, base dia about 1/2 inch. thanks! Grant in Dallas

[Enzo]

So call Samson back and ask for the schematics.

1/4" shaft or is it really 6mm?

Half shaft? Do you mean flatted side or "D-shaft"? Those are not universal. SOme are half flat, some are only about 40% flat. Also, the flatted side might be aiming at or 180 degrees away from what would be the pointer on a knob. Not world-shattering, but you need to consider those details.

1/2" sounds fine, but in searching, you might also look for 12mm or 13mm or other close size.

Mouser ha a lot of knobs, check some of these o0ut:
http://www.mouser.com/catalog/catalogusd/646/2040.pdf

Use the previous and next page buttons at top of page to see other offerings.

[DrBingo]

knobs

looking for schematic and parts list for Samson KM140 PA/mixer. I have two of these, one of which works fine. The other is missing all knobs, and only one mic channel works. All the instrument input jacks are worn out, but I have a set coming from Samson. I anticipate more problems will appear after I replace the jacks, but maybe I will get lucky and everything will be cool ...
Samson does not have any replacement knobs for this amp. who is a good source for these small knobs? 1/4" half shaft, base dia about 1/2 inch. thanks! Grant in Dallas

the shaft diameter is 234 mils.
the top view of the shaft looks like 60% shaft, and 40% cut away.
thanks for your help.
Grant in Dallas

[J M Fahey]

As Enzo guessed, 6 mm, definitely not 1/4" .

[DrBingo]

ordered the knobs

As Enzo guessed, 6 mm, definitely not 1/4" .

I found all the knobs I needed at Mouser. thanks, guys.
I will try a different department at Samson, and ask a different person for a schematic and parts list. My first contact said they had no more documents for the KM140. The parts list should have a line item for the drawing number. Of course I can still fix this powered mixer without the schematic and parts list; it will just take a bit longer.
Grant in Dallas

[Enzo]

I doubt you will find a part list, as far as I know all there is are schematics. As a Samson service center, that is all they ever send us. But it never hurts to ask. Part numbers would only help you if you were ordering from Samson.