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According to the code 121 schematic, there is a 10 mfd cap. (#75) between the driver's secondary center tapping and the ground. And there is one on mine,under the chassis, recent replacement. Later 16b sets had such capacitors installed on the chassis (small aluminum can), but in my case there is no provision for it . I checked some photos of the 121 code sets and could not find such capacitor on the top of the chassis.
Also, any place I can find the new large rubber ring for the dial wheel? I can make one, but if the professionally made ones available, I would rather go that way. Thanks.

http://www.nostalgiaair.org/PagesByModel...013139.pdf