NJ7P SQL Tube Database Query

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RK25B
Power Pentode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... 6BM

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.9 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10 pf
Output ........................................ 10 pf
Grid to Plate ................................. 0.2 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 8 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 45 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -90 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 55 mA
Grid No. 2 Current ............................ 38 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 22 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage ............................ -90 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 31 mA
Grid No. 2 Current ............................ 39 mA
Driving Power ................................. 0.8 W
Power Output (approx) ......................... 13.5 W

Class C Modulated Amplifier (Suppressor)
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ -45 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -90 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 31 mA
Grid No. 2 Current ............................ 39 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 6 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

Mon, 30 Jan 2023 00:56:02 -0700