NJ7P SQL Tube Database Query

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829
Twin Beam Power Tube

EIA Base & Outline

Application

Heater-cathode type having midtapped heater used in af power amplifier and modulator and as rf power amplifier and oscillator. Plate dissipation is per section.

Requires septar seven-contact socket and may be operated in vertical position with base up or down, or in horizontal position with pind 2 and 6 in horizontal plane.

Mechanical Data

EIA Base ...................................... 7BP

Electrical Data

Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 2.25/1.125 A

Direct Interelectrode Capacitances (approx)

Each Pentode
Input ......................................... 14.5 pf
Output ........................................ 7 pf
Grid to Plate ................................. 0.1 pf

Maximum Ratings (Design Center Values)

Each Pentode
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 225 V
Plate Dissipation ............................. 40 W
Grid No. 2 Dissipation ........................ 4 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 240 mA
Grid No. 2 Current ............................ 32 mA
Driving Power ................................. 0.7 W
Power Output (approx) ......................... 83 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 425 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -60 V
Grid No. 1 Current ............................ 11 mA
Plate Current ................................. 212 mA
Grid No. 2 Current ............................ 35 mA
Driving Power ................................. 0.8 W
Power Output (approx) ......................... 63 W

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -38 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 120 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 23 W

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(c) 1994-2021 by William A. Beech, NJ7P

Sun, 03 Jul 2022 11:35:38 -0700