This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...
March 2017 - The new Texas Instruments TPA3244 class D amplifiers with power ratings from 60 to...
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...