6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

Bootstrap with capacitor (CB8939E)
We found this circuit in a 1965 General Electric documentation. The circuit generates synchronized...
High sensitivity photo Darlington (CB8259E)
Found in a 1968 Ferranti documentation, this circuit can be implemented with modern equivalent...
5 W Amplifier with Tone Control (CB24853E)
This circuit with the ULN3784B appeared in the October 1984 issue of Radio Electronics magazine. It can...