Originally posted by WaLL
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Accuracy of the tuning is what gets the performance.
You need decent bowls, not beer cans.
Remember to tune to an octave of YOUR mains frequency.
Best of all, put a cheap speaker across your mains with a fat resistor.
since then I have had a nagging doubt , something missed .. here it is , first this video.. let me explain is simply of two stainless steel spoons separated by lighting flex and then dropped in a jam jar of tap water.
up through "sympathetic frequencies" and so "electric" also as part of the spectrum ..still as I say just thoughts on this old project and wondering about a better way to tune , I too have done that angle grinder and file business .. very hit and miss
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