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.

Power Test for Home Appliances (CB23706E)
In the figure we have a simple circuit to measure the current in an electronic device and thus...
Inverter or Shield Interface with Comparator (CB13112E)
The inversion of the switching action, with the output going high when the input is low, can be...
Bass and Guitar Preamplifier (CB16630E)
We found this preamp circuit with tone control for bass and guitar in a 1987 documentation....