I have a MIK Epiphone SG-400 (the one in my avatar), and was making some wiring changes, when I noticed the labels on the underside of the pots.
There are 3 volume controls and 1 tone control. All are 500K, however, the volume pots are labelled "B". The tone pots is an "A" type pot. This would suggest that the volume pots are linear and the tone logarithmic. The volume pots should be log pots.

I did a Google on pots and did find some info regarding the labelling convention, and it seems they differ between countries (so much for industry standardization), so I'm not sure whether log pots are "B" in Korea, or whether it is just poor QC, but there were filter caps across the vol pots as well, which I've never seen before. (I took them out).

For other Epiphone owners out there, I'd be really keen to hear what kind of pots are installed in your guitar/s.

Cheers.