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.
This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is...
Found in 1967 General Electric documentation this circuit uses a PUT and a diac to generate 1 kHz...
With the circuit shown in the figure it is possible to generate signals up to 65 MHz. The values of...