NJ7P SQL Tube Database Query

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4X250F
Power Tetrode

EIA Base & Outline

EIA Base: F75

Substitute Data

Preferred Substitutes ......................... 7204

Mechanical Data

EIA Base ...................................... F75

Electrical Data

Heater Voltage ................................ 26.5 V
Heater Current ................................ 0.58 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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Thu, 29 Sep 2022 01:29:10 -0700