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.

Speed control for car or model railroad (CB5417E)
This circuit for modeling was found in a 1980s documentation. The SCR can be the TIC106 and the...
Remote control feceiver (CB20573E)
This super regenerative detector circuit was found in an English documentation from 1963. The coil...
Three Transistor Directed Coupled Stage (CB976E)
This circuit was found in a 1968’s publication and uses germanium transistors. The characteristic...