Improvements in magnetic recording systems

摘要

855,021. Magnetic erasing heads; local Circuits. AMPEX CORPORATION. July 23, 1958 [Aug. 1, 1957], No. 23784/58. Class 40 (2). [Also in Group XL (c)] The bias and erase current generator for a magnetic recorder uses the bias and erase head windings 16, 14 as the inductive part of the resonant circuit of a complementary symmetric transistor oscillator.