Hi Bruce, In the Edison company's "Special Radio Service Bulletin #5", Section 10a (1/221929) it is stated that the phonogragh will occasionally slow down on certain loud notes if the weight on the diamond point or needle is too heavy. They further state that the this problem may usually be corrected by reducing the weight on the stylus. An adjusting screw for this purpose will be found near the pickup arm pivot. The correct weight on the stylus point is 5 ounces.
Best regards, Ben Tongue
