[Johnson] Invader 2000

[Brian Carling]

4-400A specifications for comparison:

4-400A
Power Tetrode
Data Source and Substitute Data
Prefered Substitutes .......................... None
Substitutes ................................... None
Mechanical Data
EIA Base ...................................... 5BKElectrical Data
Heater CharacteristicsHeater Voltage ................................ 5 VoltsHeater Current 
................................ 14.5 AmperesDirect Interelectrode Capacitances (approx)
TetrodeInput ......................................... 12.5 pfOutput 
........................................ 4.7 pfGrid to Plate ................................. 0.12 
pfMaximum Ratings (Design Center Values)
TetrodePlate Voltage ................................. 4000 VoltsGrid No. 2 Voltage 
............................ 600 VoltsPlate Dissipation ............................. 400 WattsGrid 
No. 2 Dissipation ........................ 35 WattsCharacteristics and Typical Operation
Class C Amplifier/Class C Modulated Amplifier (Plate)Plate Voltage 
................................. 4000 VoltsGrid No. 2 Voltage ............................ 300 
VoltsGrid No. 1 Voltage ............................ -170 VoltsGrid No. 1 Current 
............................ 10 Ma.Plate Current (Zero Signal) ................... 270 Ma.Grid 
No. 2 Current (Zero Signal) .............. 22.5 Ma.Driving Power 
................................. 10 WattsPower Output (approx) ......................... 720 
WattsGGPlate Voltage ................................. 2500 VoltsGrid No. 2 Voltage 
............................ 0 VoltsGrid No. 1 Voltage ............................ 0 VoltsGrid No. 
1 Current ............................ 100 Ma.Plate Current (Zero Signal) ................... 80 
Ma.Plate Current (Maximum Signal) ................ 270 Ma.Grid No. 2 Current (Zero 
Signal) .............. 55 Ma.Driving Power ................................. 88 WattsLoad 
Resistance ............................... 4.0K OhmsPower Output (approx) 
......................... 325 Watts