ROC pots?

[SKArface McDank]

How can I identify the values? I have a bunch of them from a 100 watt crate amp and I need a 50k pot for a pedal im building

I've read theyre made in taiwan

[boogietone]

Hook a multimeter set to ohms up to the outer two lugs of the pot. This will give you the value of the pot plus or minus some tolerance. Now disconnect one of the multimeter leads from an outer lug and connect it to the center lug. Turn the pot approx. half way. If the resistance is 50% of the previous value, it is a linear pot. If it is not, you most likely have a log pot. There are a few other pot tapers (reverse log, "W," etc.) but these are less common.

[boogietone]

See the "secret life of pots" at geofex.com for more in depth information.

[SKArface McDank]

I dont have a multimeter and that website didnt say anything about ROC pots

[lopsided]

hi,

then get a multimeter . Really, it is very helpful for building pedals and the cheapest you can find will do the job.
If you know the exact model of that amp, you can try searching for the schematic and find the values there. But really a DMM is more then worth the couple of dollars it costs.

J.

[boogietone]

In general, a potentiometer is a potentiometer: two terminals at either end of a "fixed" resistor and a "wiper" terminal that varies its position between the two end terminals to provide a variable resistance/voltage divider between the wiper and the end terminals. The value of a pot is the value of the "fixed" resistor measured between the two end terminals.

The manufacturer or country of manufacture is not relevant. ROC indicates Taiwan (Republic of China). The most straight forward method to determine the value of a pot is to use a multitester. They are available with resistance, voltage (AC and DC), capacitance, diode, transistor, and other functions for under $20 from many places. Amazon has one for $7.50 + shipping, though I DO NOT have any idea of its quality. If you plan to do any kind of electronics work, it is pretty much a necessary investment at whatever level your budget will allow.

If there are other markings on the pot they may (or likely may not) be helpful to post.

[defaced]

Looks like the 60w version has both 50k linear and audio.  Probably going to be similar/the same as the 100w version.  Parts P1 through P12 are the pots. 
http://www.webphix.com/schematic%20heaven/www.schematicheaven.com/newamps/crate_bluevoodoo_60w.pdf