For the electronics circuit of TD125 (see page 18 of the attached TD125 service manual), a modification is described in the Thorens Technical Bullet #4 (see attached file) to convert the speed control from 16/33/45 rpm to 33/45/78 rpm. For the TD 125 MK II (circuit see page 19 of the TD 125 service manual) a comparable modification is missing. The outcome of the project shall offer instructions on how to modify the circuit of the TD 125 MK II, comparable to the instructions given in the Technical Bulletin #4. A completely new electronics board design is not targeted, as a good fit to the attached mechanical components on the present boards must remain guaranteed.
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