Fig. 1 - Turntable isolation stage - The Overview. (exploded views in upcoming figs) In addition to the basic low natural frequency mechanical goal, desires were to come up with an assembly that was: A) Reasonably compact B) Appeared to be resting on the cabinet below C) Still allowed clear access to the turntable above the dustcover bottom edge. Fixed parts bolt onto the bottom of the TT-1 shelf and extend 4 towers up vertically. The pendulum chains are approx 9 inches long, giving a natural swing frequency of about 1 Hz. The chains suspend the lower swing platform. The upper swing platform is directly coupled to the lower by large tubes reaching up through the shelf bracket internal open spaces. The upper platform carries the turntable and is free to float approx /- 0.4 inch in any horiz direction.

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