NJ7P SQL Tube Database Query

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A horizontal ribbon.

307A
Power Pentode

EIA Base & Outline

EIA Base: 5J

Mechanical Data

EIA Base ...................................... 5J

Electrical Data

Heater Voltage ................................ 5.5 V
Heater Current ................................ 1 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 15 pf
Output ........................................ 12 pf
Grid to Plate ................................. 0.35 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 15 W
Grid No. 2 Dissipation ........................ 6 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 1.4 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 13 mA
Power Output (approx) ......................... 20 W

Class C Modulated Amplifier (Suppressor)
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ -50 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 1.5 mA
Plate Current ................................. 40 mA
Grid No. 2 Current ............................ 20 mA
Power Output (approx) ......................... 6 W

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A horizontal ribbon.

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Thu, 29 Sep 2022 22:23:11 -0700