Chandler tube driver pots

Long story shorter. I found my long lost 80's vintage tube driver...behind the clothes drier. After cleaning a lovely coating of lint plugged the AVRI52 in one end and a Carmen Ghia in the other.OMG!What a perfect match! I had previously changed the 12ax7 to a 12au7 to tame the gain and this is a game changing combo...feels like you're playing a super dynamic amp,not a pedal. So I HAVE to fix it.
Here's the prob: the pots are super scratchy,almost to the point of being unusable. Is anyone familiar with these things? It has square plastic pots mounted on the board. Can they be cleaned, and how? Failing that, does anyone know where to source new ones? There doesn't appear to be any marking on the pot itself, so I don't know the value either. Any and all help would be greatly appreciated. I'm not afraid of a soldering station. Thanks.

You should find what you need at Small Bear.

http://www.smallbearelec.com/servlet/Detail?no=1139

You will probably find the values marked on the pots when you remove them. If not use a multimeter and test across the two outside lugs to get the value. You can read from outside to middle and watch how the value increases to figure out the taper.

Found this schematic which lists pot values: http://analogguru.an.ohost.de/193/schematics/Chandler_TubeDriver.gif Not sure if it's accurate since I think there are a couple versions.

That should get you headed in the right direction.

Try some Deoxit first.

Thanks John. I wasn't sure I could use Deoxit on these plastic pots, I'll try that this AM. ToadLC those sites were just what I was looking for. What am I looking for when checking the taper? I'm assuming that one will be "faster" than the other, but which is which?

A logarithmic pot will have a slow increase in resistance (slower than you turn the shaft) until you get to the middle point of the pot.Then the resistance speeds up as you get closer to the clockwise lug.To find out what kind of pot you have,set it to the mid point.Measure the resistance from the wiper to the counterclockwise lug and compare it to the full resistance of the pot.If it is 1/2 of it you have a linear pot (In US marked "B").If it is 20% or less the pot is logarithmic,also called audio.(In US marked "A").In Europe the markings are reversed:A for lin. and B for log.
It is unlikely that you will find other kind of pots (e.g. neg. log.) in your pedal.P.S. Dirty pots are almost always salvageable.

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