Abstract: The apparatus is a cross fader with a slide assembly which slidingly traverses a path defined by two parallel guide rods which pass through a partially open channels in the slider of the slide assembly. Tension plates are secured by self-tapping screws within recesses laterally adjacent to open portions of at least one of the channels. The tension plates are urged radially against the guide plates, so that the tighter the screws are secured, the tighter the tension plates are urged against the guide rods and the more frictional resistance is generated when the user moves the slider.

Abstract: The apparatus is a cross fader with a slide assembly which slidingly traverses a path defined by two parallel guide rods which pass through a partially open channels in the slider of the slide assembly. Tension plates are secured by self-tapping screws within recesses laterally adjacent to open portions of at least one of the channels. The tension plates are urged radially against the guide plates, so that the tighter the screws are secured, the tighter the tension plates are urged against the guide rods and the more frictional resistance is generated when the user moves the slider.

Abstract: A needle assembly for a phonograph pickup cartridge wherein the pickup needle coupler and shank are movable relative to a drive member which is disposed between the needle shank and the mechanoelectric transducer means, to vary the position of the needle tip with respect to the cartridge drive member along the lonitudinal axis of the cartridge, and thus cause predetermined selectable changes in the needle lever ratio which in turn causes changes in compliance and output of the cartridge-needle assembly.