NJ7P SQL Tube Database Query

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812A
Power Triode

EIA Base & Outline

Application

Thoriated-tungsten-filament type used as af power amplifier and modulator and as rf power amplifier and oscillator.

Requires small four-contact socket and may be operated in vertical position base down or in horizontal position with pins 1 and 4 in vertical plane.

Mechanical Data

EIA Outline ................................... 19-10
EIA Base ...................................... 3G

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 4 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 5.4 pf
Output ........................................ 0.77 pf
Grid to Plate ................................. 5.5 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 1500 V
Plate Dissipation ............................. 65 W

Characteristics and Typical Operation

Class C Amplifier
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ -120 V
Grid No. 1 Current ............................ 30 mA
Plate Current ................................. 173 mA
Driving Power ................................. 6.5 W
Power Output (approx) ......................... 190 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ -115 V
Grid No. 1 Current ............................ 35 mA
Plate Current ................................. 140 mA
Driving Power ................................. 7.6 W
Power Output (approx) ......................... 130 W

Push Pull Class B Amplifier
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ -48 V
Peak Grid No. 1 Voltage........................ 270 V
Plate Current (Zero Signal) ................... 28 mA
Plate Current (Maximum Signal) ................ 310 mA
Driving Power ................................. 5.0 W
Load Resistance ............................... 13.2K Ω
Power Output (approx) ......................... 340 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 16:14:49 -0700