We found this tube receiver in a 1950s Japanese publication. The circuit uses 5 tubes and has an RF amplifier stage for greater sensitivity. The power supply is not shown on the circuit.
Found in 1965 General Electric documentation this circuit applies to a LASCR used as an optical...
This circuit, which can be used as a shield, was found in Radio Electronics from the 90s. The...
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...