This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...
The modified Hartley oscillator seen in the figure can generate signals ranging from 3 MHz to 10...