NJ7P SQL Tube Database Query

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828
Power Pentode

EIA Base & Outline

Application

Thoriated-tungsten-filament type used as af power amplifier and modulator and as rf power amplifier and oscillator.

Requires small five-contact socket and may be operated in vertical position with base down, or in horizontal position with pins 2 and 4 in vertical plane.

Mechanical Data

EIA Base ...................................... 5J

Electrical Data

Heater Voltage ................................ 10 V
Heater Current ................................ 3.25 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 13.5 pf
Output ........................................ 14.5 pf
Grid to Plate ................................. 0.05 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 750 V
Plate Dissipation ............................. 80 W
Grid No. 2 Dissipation ........................ 23 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 1500 V
Grid No. 3 Voltage ............................ 75 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 180 mA
Grid No. 2 Current ............................ 28 mA
Driving Power ................................. 2.2 W
Power Output (approx) ......................... 200 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 1250 V
Grid No. 3 Voltage ............................ 75 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -140 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 160 mA
Grid No. 2 Current ............................ 28 mA
Driving Power ................................. 2.7 W
Power Output (approx) ......................... 150 W

Push Pull Class AB1 Amplifier
Plate Voltage ................................. 2000 V
Grid No. 3 Voltage ............................ 60 V
Grid No. 2 Voltage ............................ 750 V
Grid No. 1 Voltage ............................ -120 V
Peak Grid No. 1 Voltage........................ 240 V
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 270 mA
Grid No. 2 Current (Zero Signal) .............. 2 mA
Grid No. 2 Current (Maximum Signal) ........... 60 mA
Driving Power ................................. 0 W
Load Resistance ............................... 18.5K Ω
Power Output (approx) ......................... 385 W

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 1500 V
Grid No. 3 Voltage ............................ 75 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -150 V
Grid No. 1 Current ............................ 1.3 mA
Plate Current ................................. 80 mA
Grid No. 2 Current ............................ 4 mA
Driving Power ................................. 1.3 W
Power Output (approx) ......................... 41 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

Thu, 29 Sep 2022 22:36:00 -0700