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.
This circuit is one of many that the reader can find in this section for testing crystals. The...
This circuit was found in a Philips documentation from 1966. Its purpose is to drive the solenoid...
This sinusoidal oscillator is suggested by Texas Instruments' Linear Circuits Applications, using a...