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.
The LM143 integrated circuit is a high voltage operational amplifier from National Semiconductor that is...
This power supply can provide 10 A currents. Its regulation is made by 7812 integrated circuit. The...
We found this circuit in the November 1992 Radio Electronics magazine. It works with both...