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Actually, simple filament bulbs are reactive enough to be adequate for this purpose. However, tolerance on Mains frequency is too coarse for setting up a T/T. What you need is a quartz-locked, hand-held, battery powered LED flasher to get an accurate indication such as :
Hope this helps.
You will need a turntable strobe strobe disk. The markings will be set for either a 50hz or 60hz line frequency depending on your country's power supply. In North America, we have 60hz power. Just set the StrobeLight at 60hz and point it at the revolving strobe disc. When the table's speed reaches 33.333RPM, the strobe lines will appear stationary.
Thanks for telling us about the app, brf. I would never have thought to check for an app. If you are too non-tech to go that route, the no-brainer solution is to buy the hand-held, battery powered strobe from KAB. Along with their strobe disc, you will have a very accurate estimate of speed. The others are correct to say that depending upon a steady 60Hz AC line frequency powering the bulb is chancy.
The KAB battery strobe is the way to go, but the strobe disc you 'printed out' is only partially accurate. You really need to purchase the "Cardas Frequency Sweep and Burn-In Record. It has a set of various strobe speeds printed on the label. You should set your table speed with the stylus engaged into a record grove. Believe it or not the slight, minuscule drag from the diamond in the groove will create RPM loss, which may lead to unhappy listening sessions. Some people even run a bit of 'advance' on their tables, which is more pleasing to the brain for some odd reason.