[Charlie]

It appears he got them from ebay... it's the same set... look at the top corner tear on the red package.

So now, we have to determine what the dang thing does. Is it simply increasing the screen control even higher than the set does, or is it adjusting the kine bias for just that one gun?

Obviously, this device can't be too hi-tech... I am sure it can be easily made from spare parts in our kitchen junk drawer (yeah we all have one of those).

Timmy: Just to confirm, you are placing this device between your CRT and your tester, and as you increase the pot, it brings the emissions reading up for that one gun on your tester? Also, you are pleased with the visual results you see with the set operating?