NJ7P SQL Tube Database Query

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4E27
Beam Power Pentode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... 7BM

Electrical Data

Heater Voltage ................................ 5.0 V
Heater Current ................................ 7.5 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 12 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.06 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 750 V
Plate Dissipation ............................. 75 W
Grid No. 2 Dissipation ........................ 30 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 750 V
Grid No. 1 Voltage ............................ -200 V
Grid No. 1 Current ............................ 0.7 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 18 mA
Driving Power ................................. 0.2 W
Power Output (approx) ......................... 230 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 1800 V
Grid No. 3 Voltage ............................ 60 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -200 V
Grid No. 1 Current ............................ 0.6 mA
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 8 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 200 W

Class C Modulated Amplifier (Suppressor)
Plate Voltage ................................. 2000 V
Grid No. 3 Voltage ............................ -300 V
Grid No. 2 Voltage ............................ 500 V
Grid No. 1 Voltage ............................ -130 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 55 mA
Grid No. 2 Current ............................ 45 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 35 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 01:46:26 -0700