NJ7P SQL Tube Database Query

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5-125B
Beam Power Pentode

EIA Base & Outline

EIA Base: 7BM

Mechanical Data

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

Electrical Data

Heater Voltage ................................ 5 V
Heater Current ................................ 7.5 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10.5 pf
Output ........................................ 4.7 pf
Grid to Plate ................................. 0.08 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 750 V
Plate Dissipation ............................. 125 W
Grid No. 2 Dissipation ........................ 20 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 3000 V
Grid No. 3 Voltage ............................ 60 V
Grid No. 2 Voltage ............................ 500 V
Grid No. 1 Voltage ............................ -200 V
Grid No. 1 Current ............................ 6 mA
Plate Current ................................. 167 mA
Grid No. 2 Current ............................ 5 mA
Driving Power ................................. 1.6 W
Power Output (approx) ......................... 375 W

Class C Amplifier
Plate Voltage ................................. 1000 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 750 V
Grid No. 1 Voltage ............................ -170 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 160 mA
Grid No. 2 Current ............................ 21 mA
Driving Power ................................. 0.6 W
Power Output (approx) ......................... 115 W

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Wed, 07 Dec 2022 12:27:29 -0700