Tape head ke liye mostly LA3161 ic used hoti hai par vo easily available nhi ho pati, but BC548 transistor easily available hai, isiliye aap BC548 based pre amplifier circuit bna kar dikhaye, Mere jaise kai logo ko pre amplifier circuit nhi mil pate , aapki video dekh kar hum log assemble kar lenge
another superb video, is MJL a drop in replacement on the 1943-5200 type board ? so that people can increase the board design output simply by using the MJL transistors on 1943 designs and upgrading the input power Xfer and PSU
Balance input is a method where the signal is splitted in two phases and the ground is work as a Shield not for communication so it reduce long wire noise problem