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 amplifier with a few watts of power was found in a Japanese technical documentation from the...
This circuit is from a 1977 National Semiconductor integrated circuits manual. The circuit admits...
This conventional power supply uses discrete components and can provide 12 V or 13.6 V output with...