Show ga VB wf gy 53 s a ss t y s I 1 oil row AW am IJ aa 16 A use J putting pickup pick up unit across the grid circuit the phonograph pickup unit la isi nothing but au an inverted loud speaker unit it transforms mechanical energy into electrical it does docs this by mec mechanically lian varying the reluctance in the As the reluctance la Is varied according to the record in the groove tile the flux in the magnetic circuit is varied the variation in the alie flux i induces an electromotive electro motive force forc e in the coll coil wound around the armature if the coll coil around tile the armature Is connected directly into the grid circuit of a tube the entire electromotive force induced in the coll coil will be impressed on the prid it if tl alie io coil Is connected in series with the primary of a transformer the electromotive electro motive force will drive a circuit through 1116 thus alius completed tir clr f cult part of the t tie electromotive electro elect ro motive force will be expended in the armature coll coil an and d part in the primary of the trims transformer former only that expended in the primary Is useful in producing a signal on the tube following the transformer it la Is therefore better to connect the pickup unit across the grid circuit |