NJ7P SQL Tube Database Query

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A horizontal ribbon.

RK28A
Power Pentode

EIA Base & Outline

EIA Base: 5J

Mechanical Data

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

Electrical Data

Heater Voltage ................................ 10 V
Heater Current ................................ 5.0 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 15 pf
Output ........................................ 15 pf
Grid to Plate ................................. 0.02 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 400 V
Plate Dissipation ............................. 125 W
Grid No. 2 Dissipation ........................ 35 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 2000 V
Grid No. 3 Voltage ............................ 45 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 170 mA
Grid No. 2 Current ............................ 60 mA
Driving Power ................................. 1.6 W
Power Output (approx) ......................... 250 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 1500 V
Grid No. 3 Voltage ............................ 45 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 135 mA
Grid No. 2 Current ............................ 54 mA
Driving Power ................................. 1.6 W
Power Output (approx) ......................... 150 W

Class C Modulated Amplifier (Suppressor)
Plate Voltage ................................. 2000 V
Grid No. 3 Voltage ............................ -45 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -115 V
Grid No. 1 Current ............................ 11.5 mA
Plate Current ................................. 90 mA
Grid No. 2 Current ............................ 52 mA
Driving Power ................................. 1.5 W
Power Output (approx) ......................... 60 W

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 2000 V
Grid No. 3 Voltage ............................ 45 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 80 mA
Grid No. 2 Current ............................ 18 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 60 W

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Mon, 30 Jan 2023 02:02:58 -0700