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4X250B
Power Tetrode
Preferred
Substitutes ......................... 7203
Mechanical Data
EIA Base
...................................... F75
Electrical Data
Heater
Voltage ................................ 6 V
Heater Current
................................ 2.1 A
Direct Interelectrode Capacitances
(approx)
Tetrode
Input .........................................
18.5 pf
Output ........................................ 4.7 pf
Grid to Plate
................................. 0.04 pf
Maximum Ratings (Design Center Values)
Tetrode
Plate Voltage .................................
2000 V
Grid No. 2 Voltage ............................ 400 V
Plate Dissipation
............................. 250 W
Grid No. 2 Dissipation
........................ 12 W
Characteristics and Typical Operation
Class C Oscillator/Amplifier
Plate Voltage
................................. 2000 V
Grid No. 2 Voltage
............................ 250 V
Grid No. 1 Voltage
............................ -90 V
Grid No. 1 Current
............................ 27 mA
Plate Current
................................. 250 mA
Grid No. 2 Current .............
.............. 25 mA
Driving Power ................................. 2.8
W
Power Output (approx) ......................... 410 W
Class C Modulated Amplifier (Plate)
Plate Voltage
................................. 1500 V
Grid No. 2 Voltage
............................ 250 V
Grid No. 1 Voltage
............................ -100 V
Grid No. 1 Current
............................ 17 mA
Plate Current
................................. 200 mA
Grid No. 2 Current .............
.............. 25 mA
Driving Power ................................. 2.1
W
Power Output (approx) ......................... 250 W
Push Pull Class AB1 Amplifier
Plate Voltage ................................. 2000
V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage
............................ -50 V
Peak Grid No. 1
Voltage........................ 100 V
Plate Current
................................. 500 mA
Grid No. 2 Current .............
.............. 30 mA
Driving Power ................................. 0
W
Load Resistance ............................... 8.26K Ω
Power Output (approx)
......................... 650 W
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