![Conrad Johnson Premier One (1) Legendary Tube Amplifier New tubes just serviced! – St. John's Institute (Hua Ming) Conrad Johnson Premier One (1) Legendary Tube Amplifier New tubes just serviced! – St. John's Institute (Hua Ming)](https://i.ebayimg.com/images/g/8rEAAOSwD1dkbjJ7/s-l1600.jpg)
Conrad Johnson Premier One (1) Legendary Tube Amplifier New tubes just serviced! – St. John's Institute (Hua Ming)
A ball is released from top of the smooth vertical tube .The angle made by the ball with vertical when it just leaves the contact from the inner surface of the tube
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