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Here's a useful gadget if you still play reocrds - if you have an adjustable speed turntable (Lenco etc.), then just print out this page onto thin card. Cut out the disc below and make the small hole in the centre with the point of scissors etc.
Place the speed indicator disc on your gramophone turntable - view by the light of an electric lamp. When the turntable is rotating at a precise speed of 78 rpm (revs/minute) the blue spokes will appeare to be stationary; at 45 rpm the red spokes and at 331/3 rpm the green spokes.
This device will only work correctly in countries where the AC mains frequency is 50 Hz. (This means the UK, most of Europe etc. but not the USA)
Universal gramophone speed indicator disc
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Last updated: 21 April 2016 ..................... musicstrobo.htm ..................... Grahame Newnham's Web Pages