(image from drawing of Ortofon DSS-731, rocking bridge stereo cutting head, found on this website:
http://www7a.biglobe.ne.jp/~yosh/jvc_cutter.htm)
rocking bridge
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Fonotec
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rocking bridge
The rocking bridge replaces the torque tube, which improves efficiency, and the hinge design allows for extremely fast accelerations (translating to frequency range at power) - examples are usually ruler-flat to above 22 kcps and have usable response to 40 kc, with feedback starting around 4 Hz and going up to 150 kHz on the best models. This is the general design used for CD-4 vinyl discs with quadrophonic audio, as well as audiophile, stereo monogrooves.
(image from drawing of Ortofon DSS-731, rocking bridge stereo cutting head, found on this website:
http://www7a.biglobe.ne.jp/~yosh/jvc_cutter.htm)
(image from drawing of Ortofon DSS-731, rocking bridge stereo cutting head, found on this website:
http://www7a.biglobe.ne.jp/~yosh/jvc_cutter.htm)