Amplifier stage with the T411E (T411E)

The pentode tube used in this circuit has 1.5 V filament. The circuit is a voltage amplifier with the 1U5 tube.

Wien Bridge Oscillator MC1776 (CB4498E)
The integrated circuit used in this project is not common today, but it can be implemented with more...
Analog Capacmeter (CB3930E)
This circuit has been found in an old American documentation, but can be easily implemented with common...
DC to DC Converter (CB4819E)
This circuit was obtained from a datasheet from Linear Technology. The circuit converts the...