NJ7P SQL Tube Database Query

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T20
Power Triode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... 3G

Electrical Data

Heater Voltage ................................ 7.5 V
Heater Current ................................ 1.75 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 4.9 pf
Output ........................................ 0.7 pf
Grid to Plate ................................. 5.1 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 750 V
Plate Dissipation ............................. 20 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 750 V
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Current ............................ 18 mA
Plate Current ................................. 85 mA
Driving Power ................................. 3.6 W
Power Output (approx) ......................... 44 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 750 V
Grid No. 1 Voltage ............................ -140 V
Grid No. 1 Current ............................ 15 mA
Plate Current ................................. 70 mA
Driving Power ................................. 3.6 W
Power Output (approx) ......................... 38 W

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

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

Sat, 25 Jun 2022 10:57:18 -0700