NJ7P SQL Tube Database Query

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RK47
Power Pentode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... F64

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 13 pf
Output ........................................ 10 pf
Grid to Plate ................................. 0.12 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 1250 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 50 W
Grid No. 2 Dissipation ........................ 10 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 1250 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -70 V
Grid No. 1 Current ............................ 7 mA
Plate Current ................................. 138 mA
Grid No. 2 Current ............................ 14 mA
Driving Power ................................. 1.0 W
Power Output (approx) ......................... 120 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 900 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -150 V
Grid No. 1 Current ............................ 6 mA
Plate Current ................................. 120 mA
Grid No. 2 Current ............................ 17.5 mA
Driving Power ................................. 1.4 W
Power Output (approx) ......................... 87 W

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 1250 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -30 V
Grid No. 1 Current ............................ 0.9 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 2 mA
Driving Power ................................. 4.0 W
Power Output (approx) ......................... 25 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

Sun, 26 Jun 2022 05:06:47 -0700