NJ7P SQL Tube Database Query

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312A
Power Pentode

EIA Base & Outline

Mechanical Data

EIA Base ...................................... T6C

Electrical Data

Heater Voltage ................................ 10 V
Heater Current ................................ 2.8 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 15.5 pf
Output ........................................ 12.3 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 1250 V
Grid No. 2 Voltage ............................ 500 V
Plate Dissipation ............................. 50 W
Grid No. 2 Dissipation ........................ 20 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 1250 V
Grid No. 3 Voltage ............................ 20 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Current ............................ 5.5 mA
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 36 mA
Driving Power ................................. 0.7 W
Power Output (approx) ......................... 90 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 1000 V
Grid No. 3 Voltage ............................ 40 V
Grid No. 1 Voltage ............................ -40 V
Grid No. 1 Current ............................ 7 mA
Plate Current ................................. 95 mA
Grid No. 2 Current ............................ 35 mA
Driving Power ................................. 1.0 W
Power Output (approx) ......................... 65 W

Class C Modulated Amplifier (Suppressor)
Plate Voltage ................................. 1250 V
Grid No. 3 Voltage ............................ -85 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Current ............................ 5 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 42 mA
Driving Power ................................. 0.55 W
Power Output (approx) ......................... 23 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

Mon, 30 Jan 2023 00:47:30 -0700