NJ7P SQL Tube Database Query

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829A
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 ......................................... 14.4 pf
Output ........................................ 7 pf
Grid to Plate ................................. 0.1 pf

Maximum Ratings (Design Center Values)

Each Pentode
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 240 V
Plate Dissipation ............................. 40 W
Grid No. 2 Dissipation ........................ 7 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 160 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 0.8 W
Power Output (approx) ......................... 87 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -70 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 0.9 W
Power Output (approx) ......................... 70 W

Class C Modulated Amplifier (Grid)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 8 mA
Grid No. 2 Current ............................ 5 mA
Driving Power ................................. 0.7 W
Power Output (approx) ......................... 24 W

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

Tue, 21 Mar 2023 04:17:17 -0700