Found in an American publication from 1947, this 4-tube amplifier has excellent sound quality. Its source makes use of a transformer.
This circuit produces a sine 1 kHz signal. The frequency is given by C1, C2 and C3. This is a...
This circuit is a traditional configuration with the 741 Operational Amplifier and its gain is...
We find this vibrato configuration with transistors in a 1987 documentation. The components are still...