NJ7P SQL Tube Database Query

A horizontal ribbon.

Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.

A horizontal ribbon.

811A
Power Triode

EIA Base & Outline

EIA Base: 3GEIA Bulb: 19-10
Source ........................................ RCA TT-5 - 1962

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

Bulb .......................................... ST-19
Base Type ..................................... Medium-Shell Small 4-Pin Micanol with Bayonet
EIA Outline ................................... 19-10
EIA Base ...................................... 3G
Top Cap ....................................... Medium C1-5
Cathode ....................................... Thoriated Tungsten
Mounting Position ............................. Vertical base down or horizontal pins 1 & 4 in vertical plane

Electrical Data

Filament Voltage .............................. 6.3 V
Filament Current .............................. 4.0 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 5.9 pf
Output ........................................ 0.7 pf
Grid to Plate ................................. 5.6 pf

Maximum Ratings (Design Center Values)

AF Power Amplifier & Modulator - Class B (CCS)
Plate Voltage ................................. 1250 V
Plate Input ................................... 165 W
Plate Dissipation ............................. 45 W
Plate Current ................................. 175 mA

AF Power Amplifier & Modulator - Class B (ICAS)
Plate Voltage ................................. 1500 V
Plate Input ................................... 235 W
Plate Dissipation ............................. 65 W
Plate Current ................................. 175 mA

Linear RF Power Amplifier - Class AB2 (CCS)
Plate Voltage ................................. 1250 V
Plate Input ................................... 165 W
Plate Dissipation ............................. 45 W
Plate Current ................................. 175 mA
Grid Current .................................. 50 mA

Linear RF Power Amplifier - Class AB2 (ICAS)
Plate Voltage ................................. 1500 V
Plate Input ................................... 235 W
Plate Dissipation ............................. 60 W
Plate Current ................................. 175 mA
Grid Current .................................. 50 mA

Plate-Modulated RF Power Amplifier - Class C (CCS)
Plate Voltage ................................. 1000 V
Negative Grid No. 1 Voltage ................... -200 V
Plate Input ................................... 115 W
Plate Dissipation ............................. 30 W
Plate Current ................................. 125 mA
Grid Current .................................. 50 mA

Plate-Modulated RF Power Amplifier - Class C (ICAS)
Plate Voltage ................................. 1500 V
Negative Grid No. 1 Voltage ................... -200 V
Plate Input ................................... 175 W
Plate Dissipation ............................. 45 W
Plate Current ................................. 150 mA
Grid Current .................................. 50 mA

RF Power Amplifier & Oscillator - Class C (CCS)
Plate Voltage ................................. 1250 V
Negative Grid No. 1 Voltage ................... -200 V
Plate Input ................................... 175 W
Plate Dissipation ............................. 45 W
Plate Current ................................. 175 mA
Grid Current .................................. 50 mA

RF Power Amplifier & Oscillator - Class C (ICAS)
Plate Voltage ................................. 1500 V
Negative Grid No. 1 Voltage ................... -200 V
Plate Input ................................... 260 W
Plate Dissipation ............................. 65 W
Plate Current ................................. 175 mA
Grid Current .................................. 50 mA

Characteristics and Typical Operation

RF Power Amplifier & Oscillator - Class C (CCS)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 1100 Ω
Cathode Bias Resistor ...................... 270 Ω
Peak Grid No. 1 Voltage........................ 140 V
Grid No. 1 Current ............................ 45 mA
Plate Current ................................. 140 mA
Driving Power ................................. 5.7 W
Power Output (approx) ......................... 135 W
Maximum Frequency ............................. 30 MHz

RF Power Amplifier & Oscillator - Class C (ICAS)
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ -70 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 1750 Ω
Cathode Bias Resistor ...................... 330 Ω
Peak Grid No. 1 Voltage........................ 175 V
Grid No. 1 Current ............................ 40 mA
Plate Current ................................. 173 mA
Driving Power ................................. 7.1 W
Power Output (approx) ......................... 200 W
Maximum Frequency ............................. 30 MHz

Plate-Modulated RF Power Amplifier - Class C (CCS)
Plate Voltage ................................. 1000 V
Grid No. 1 Voltage ............................ -55 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 1200 Ω
Peak Grid No. 1 Voltage........................ 150 V
Grid No. 1 Current ............................ 45 mA
Plate Current ................................. 115 mA
Driving Power ................................. 6.1 W
Power Output (approx) ......................... 88 W
Maximum Frequency ............................. 30 MHz

Plate-Modulated RF Power Amplifier - Class C (ICAS)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ -120 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 2700 Ω
Peak Grid No. 1 Voltage........................ 250 V
Grid No. 1 Current ............................ 45 mA
Plate Current ................................. 140 mA
Driving Power ................................. 10 W
Power Output (approx) ......................... 135 W
Maximum Frequency ............................. 30 MHz

Push Pull AF Power Amplifier & Modulator - Class B (CCS)
Plate Voltage ................................. 750 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 197 V
Plate Current (Zero Signal) ................... 32 mA
Plate Current (Maximum Signal) ................ 350 mA
Driving Power ................................. 9.7 W
Load Resistance ............................... 5.1K Ω
Power Output (approx) ......................... 178 W

Push Pull AF Power Amplifier & Modulator - Class B (CCS)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 145 V
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 260 mA
Driving Power ................................. 3.8 W
Load Resistance ............................... 12.4K Ω
Power Output (approx) ......................... 235 W

Push Pull AF Power Amplifier & Modulator - Class B (ICAS)
Plate Voltage ................................. 1000 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 185 V
Plate Current (Zero Signal) ................... 44 mA
Plate Current (Maximum Signal) ................ 350 mA
Driving Power ................................. 7.5 W
Load Resistance ............................... 7.4K Ω
Power Output (approx) ......................... 248 W

Push Pull AF Power Amplifier & Modulator - Class B (ICAS)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 175 V
Plate Current (Zero Signal) ................... 54 mA
Plate Current (Maximum Signal) ................ 350 mA
Driving Power ................................. 6 W
Load Resistance ............................... 9.2K Ω
Power Output (approx) ......................... 310 W

Push Pull AF Power Amplifier & Modulator - Class B (ICAS)
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ -4.5 V
Peak Grid No. 1 Voltage........................ 170 V
Plate Current (Zero Signal) ................... 32 mA
Plate Current (Maximum Signal) ................ 313 mA
Driving Power ................................. 4.4 W
Load Resistance ............................... 12.4K Ω
Power Output (approx) ......................... 340 W

Linear RF Power Amplifier - Class AB2 (CCS)
Plate Voltage ................................. 1250 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 20 mA
Plate Current (Zero Signal) ................... 25 mA
Plate Current (Maximum Signal) ................ 130 mA
Driving Power ................................. 7.0 W
Load Resistance ............................... 5.7K Ω
Power Output (approx) ......................... 120 W
Maximum Frequency ............................. 30 MHz

Linear RF Power Amplifier - Class AB2 (ICAS)
Plate Voltage ................................. 1500 V
Grid No. 1 Voltage ............................ -4.5 V
Grid No. 1 Current ............................ 20 mA
Plate Current (Zero Signal) ................... 16 mA
Plate Current (Maximum Signal) ................ 157 mA
Driving Power ................................. 8 W
Load Resistance ............................... 6.0K Ω
Power Output (approx) ......................... 160 W
Maximum Frequency ............................. 30 MHz

A horizontal ribbon.

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.

Please enter the tube number:

This database contains data on thousands of tubes. Every effort has been made to insure the accuracy of this reference, however, I assume no liability for the results of using information contained herein.

Other Tube Search Engines:
Frank's Electron Tube Pages

Complete Tube Manuals:
Tube Manual Index from NJ7P

A horizontal ribbon.

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

Mon, 15 Aug 2022 19:10:43 -0700