This 2-tube amplifier was found in a Japanese publication of 1964. The circuit has excellent sound quality. The power supply is not given and must provide a voltage of 300 V.
We found this circuit in an old RF documentation. The circuit must employ RF transistors and the...
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...
This circuit with the operational amplifier CA3130 was found in an English publication from 1977....