6SN7 Preamplifier (T1105E)

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

0 to 12 V power supply with 1 A (CB8165E)
Found in a 1991 PE Hobbyst Handbook, this unit can actually supply 1.5 A with the LM317 and 3 A...
1A 4-Voltage Supply (CB18065E)
This fixed source configuration with 78xx series regulators has already been explored in several...
FET Input Operational (CB13628E)
This configuration was obtained in a 1977 FET Databook. The circuit can be practically any JFET...