how to set speed with strobe and speed controller

Put the strobe disc on the turntable, as though it is a record with the spindle of the turntable going through the hole in the strobe disc. There are usally four bands of bars on the disc, one each marked 60HZ and 50HZ and 33.33 and 45RPM. If you are in North America start with the 60HZ 33.33 rpm band, turn on your turntable and set it to 33.33. Hold the light directly over the disc with all other lights out. Adjust the speed control until the bars on the 60HZ 33.33 rpm band appear to stop moving. Repeat the process for 45rpm and you are home free. If you have other questions, please feel free to contact me directly, off board.
Marty

I prefer the bars where the light is very low. Sorry, couldn't resist. It is easier to see them with a flourescent light. Radio Shack has one in a little housing that is used as a panel lamp, all you have to do is hook it up with some lamp cord and throw a plug on the other end. It has a colored jewel, which just unscrews on the top. It is compact, cheap and convenient. I think the whole affair will cost about $3.00 to rig up if you are handy. If not, usual disclaimer, I am not responsible for you burning down the house and killing yourself and I will not send flowers to the funeral.
Marty