NJ7P SQL Tube Database Query

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4CX300A
Beam Power Pentode

EIA Base & Outline

Mechanical Data

Electrical Data

Heater Voltage ................................ 6 V
Heater Current ................................ 2.75 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 29.5 pf
Output ........................................ 4.8 pf
Grid to Plate ................................. 0.04 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 400 V
Plate Dissipation ............................. 300 W
Grid No. 2 Dissipation ........................ 12 W

Characteristics and Typical Operation

Class C 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. 3 Voltage ............................ -100 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ 200 V
Grid No. 1 Current ............................ 2.1 mA
Plate Current ................................. 25 mA
Grid No. 2 Current ............................ 17 mA
Load Resistance ............................... 250 Ω

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 23:17:52 -0700