Standard Spec for Ferrite Pot Style

your absolutely bang on, more than likely early 68, the ferrite core looks like it has the MullardFerrox cube FX designated 4 slot inductor

cores 201 PQ cores 269 PM cores 288 EP, EPX, EPO cores 303 P cores 335 P core halves for proximity switches 387 Packing 183

4 slot diffuser A new rotation socket is introduced along with eight new nodes for simpler processing Finally the pot is moved to the top of the shelf

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