NJ7P SQL Tube Database Query

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RK49
Power Tetrode

EIA Base & Outline

EIA Base: T8B

Mechanical Data

EIA Base ...................................... T8B

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.9 A

Direct Interelectrode Capacitances (approx)

Tetrode
Input ......................................... 11.5 pf
Output ........................................ 10.6 pf
Grid to Plate ................................. 1.4 pf

Maximum Ratings (Design Center Values)

Tetrode
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 21 W
Grid No. 2 Dissipation ........................ 3.5 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Current ............................ 3 mA
Plate Current ................................. 95 mA
Grid No. 2 Current ............................ 8 mA
Driving Power ................................. 0.2 W
Power Output (approx) ......................... 25 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 5 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.34 W
Power Output (approx) ......................... 12 W

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Sat, 02 Jul 2022 23:17:07 -0700