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.

Heater Control (CB21369E)
This circuit was found in an old GE manual. It uses a thermocouple as a sensor. The SCR must be in...
Circuit for NE602 projects (CB26011E)
This circuit was found in the February 1997 Electronics Now magazine. The circuit has a power...
Current Booster (CB4901E)
We found this circuit in an old American operational Amp. documentation. The circuit applies to...