12AU7/ECC82

                MAXIMUM RATINGS (Each Section)

                    Design Center Values

Zero Signal Plate Voltage                                     550 volts
Plate Voltage                                                 300 volts
Plate Dissipation                                            2.75 watts
Cathode Current                                                20 mA
Grid Voltage                                                 -100 volts
Grid to Plate Voltage                                        -250 volts
   Grid Voltage (Grid current = + 0.3 uA)                    -1.3 volts
   Grid Resistance [4]                                          1 megohm
   Heater to Catbode Voltage                                  180 volts
   Heater to Cathode Resistance                            20,000 ohms
   Heater to Cathote Resistance [5]                       150,000 ohms

                  Typical Operating Conditions

                 Class A amplifier (Each Section)

   Plate Voltage                             100              250 volts
   Grid Voltage                                0             -8.5 volts
   Amplification Factor                     19.5               17
   Plate Resistance (approx)                6250             7700 ohms
   Transconductance                         3100             2200 micromhos
   Plate Current                            11.8             10.5 mA




[Schematic of resistance-coupled amplifier omitted from text file]


[4] With self bias.

[5] In phase inverting circuits.