NJ7P SQL Tube Database Query

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7843
Beam Power Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 7842 7844

Mechanical Data

Electrical Data

Heater Voltage ................................ 26.5 V
Heater Current ................................ 0.52 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 14 pf
Output ........................................ 0.015 pf
Grid to Plate ................................. 0.065 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 1000 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 180 W
Grid No. 2 Dissipation ........................ 4.5 W

Characteristics and Typical Operation

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 650 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 30 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 200 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 50 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 850 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 30 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 200 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 80 W

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 650 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 46 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 355 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 25 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 85 W

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 850 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 46 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 355 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 25 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 140 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 5 mA
Driving Power ................................. 2 W
Power Output (approx) ......................... 16 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 700 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 130 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 45 W

Class C Oscillator/Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 5 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 23 W

Class C Oscillator/Amplifier (400 Mhz)
Plate Voltage ................................. 900 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -30 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 170 mA
Grid No. 2 Current ............................ 1 mA
Driving Power ................................. 3 W
Power Output (approx) ......................... 80 W

Class C Oscillator/Amplifier (900 Mhz)
Plate Voltage ................................. 900 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -22 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 170 mA
Grid No. 2 Current ............................ 1 mA
Driving Power ................................. 5 W
Power Output (approx) ......................... 40 W

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Wed, 07 Dec 2022 13:09:52 -0700