NJ7P SQL Tube Database Query

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2E25
Beam Power Pentode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... 5BJ

Electrical Data

Heater Voltage ................................ 6 V
Heater Current ................................ 0.8 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 8.5 pf
Output ........................................ 6.7 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 15 W
Grid No. 2 Dissipation ........................ 4 W

Characteristics and Typical Operation

Class C Oscillator/Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 75 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 24 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 12 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 16 W

Push Pull Class AB2 Amplifier
Plate Voltage ................................. 450 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -30 V
Grid No. 1 Current ............................ 3 mA
Plate Current (Zero Signal) ................... 44 mA
Plate Current (Maximum Signal) ................ 150 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 40 mA
Driving Power ................................. 0.9 W
Load Resistance ............................... 6K Ω
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

Mon, 05 Dec 2022 02:19:05 -0700