NJ7P SQL Tube Database Query

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837
Beam Power Pentode

EIA Base & Outline

Application

Heater-cathode type used as rf power amplifier and oscillator. Requires medium seven-contact socket and may be operated in any position.

Mechanical Data

Bulb .......................................... ST-16
Base Type ..................................... Medium 7-Pin Ceramic Bayonet
EIA Outline ................................... 16-2
EIA Base ...................................... 6BM
Top Cap ....................................... Small Metal C1-1
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 12.6 V
Heater Current ................................ 0.7 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 16 pf
Output ........................................ 10 pf
Grid to Plate ................................. 0.2 pf

Maximum Ratings (Design Center Values)

RF Power Amplifier - Class B Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Plate Input ................................... 16 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 5 W
Plate Current ................................. 40 mA

Suppressor-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 16 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 8 W
Plate Current ................................. 40 mA

Grid-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 16 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 5 W
Plate Current ................................. 40 mA

Plate-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 20 W
Plate Dissipation ............................. 8 W
Grid No. 2 Dissipation ........................ 5 W
Plate Current ................................. 50 mA

Tetrode Plate-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 20 W
Plate Dissipation ............................. 8 W
Grid No. 2 Dissipation ........................ 7.5 W
Plate Current ................................. 50 mA
Grid Current .................................. 8 mA

RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 32 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 8 W
Plate Current ................................. 80 mA
Grid Current .................................. 8 mA

Tetrode RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 200 V
Grid No. 2 Voltage ............................ 200 V
Negative Grid No. 1 Voltage ................... 200 V
Plate Input ................................... 32 W
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 8 W
Plate Current ................................. 80 mA
Grid Current .................................. 8 mA

Characteristics and Typical Operation

RF Power Amplifier - Class B Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 28 V
Grid No. 1 Current ............................ 1 mA
Plate Current ................................. 35 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 4 W

RF Power Amplifier - Class B Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 25 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 30 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.2 W
Power Output (approx) ......................... 5 W

RF Power Amplifier - Class B Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 40 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 24 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 30 mA
Grid No. 2 Current ............................ 12 mA
Driving Power ................................. 0.1 W
Power Output (approx) ......................... 5.5 W

Suppressor-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ -55/55 V
Grid No. 2 Dropping Resistor .................. 6.5K Ω
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 2.5K Ω
Peak Grid No. 1 Voltage........................ 45 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 35 mA
Grid No. 2 Current ............................ 37 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 4 W

Suppressor-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ -65/65 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 2 Dropping Resistor .................. 14K Ω
Grid No. 1 Voltage ............................ -25 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 5.7K Ω
Peak Grid No. 1 Voltage........................ 32 V
Grid No. 1 Current ............................ 3.5 mA
Plate Current ................................. 30 mA
Grid No. 2 Current ............................ 23 mA
Driving Power ................................. 0.1 W
Power Output (approx) ......................... 5 W

Grid-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 58 V
Grid No. 1 Current ............................ 1 mA
Plate Current ................................. 35 mA
Grid No. 2 Current ............................ 9 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 4 W

Grid-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 48 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 30 mA
Grid No. 2 Current ............................ 7 mA
Driving Power ................................. 0.2 W
Power Output (approx) ......................... 5 W

Grid-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 40 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -43 V
Peak Grid No. 1 Voltage........................ 44 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 30 mA
Grid No. 2 Current ............................ 6 mA
Driving Power ................................. 0.15 W
Power Output (approx) ......................... 5.5 W

Plate-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 40 V
Grid No. 2 Voltage ............................ 140 V
Grid No. 2 Dropping Resistor .................. 13K Ω
Grid No. 1 Voltage ............................ -40 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 8K Ω
Peak Grid No. 1 Voltage........................ 60 V
Grid No. 1 Current ............................ 5 mA
Plate Current ................................. 45 mA
Grid No. 2 Current ............................ 20 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 11 W

Tetrode Plate-Modulated RF Power Amplifier - Class C Telephony
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 2 Dropping Resistor .................. 10K Ω
Grid No. 1 Voltage ............................ -70 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 10K Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 7 mA
Plate Current ................................. 45 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 0.7 W
Power Output (approx) ......................... 11 W

RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 2 Dropping Resistor .................. 6.3K Ω
Grid No. 1 Voltage ............................ -40 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 5K Ω
Peak Grid No. 1 Voltage........................ 70 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 70 mA
Grid No. 2 Current ............................ 32 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 16 W

RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 2 Dropping Resistor .................. 10K Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 10.6K Ω
Peak Grid No. 1 Voltage........................ 120 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 0.8 W
Power Output (approx) ......................... 20 W

RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 2 Dropping Resistor .................. 20K Ω
Grid No. 1 Voltage ............................ -75 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 18.7K Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 4 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 22 W

Tetrode RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 400 V
Grid No. 3 Voltage ............................ 110 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 2 Dropping Resistor .................. 11.6K Ω
Grid No. 1 Voltage ............................ -70 V
Peak Grid No. 1 Voltage........................ 115 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 70 mA
Grid No. 2 Current ............................ 25 mA
Driving Power ................................. 0.75 W
Power Output (approx) ......................... 18 W

Tetrode RF Power Amplifier & Oscillator - Class C Telegraphy
Plate Voltage ................................. 500 V
Grid No. 3 Voltage ............................ 80 V
Grid No. 2 Voltage ............................ 80 V
Grid No. 2 Dropping Resistor .................. 28K Ω
Grid No. 1 Voltage ............................ -70 V
Peak Grid No. 1 Voltage........................ 110 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.7 W
Power Output (approx) ......................... 20 W

Notes

1. Grid 2 and 3 tied together for tetrode connection.

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

Thu, 29 Sep 2022 23:03:20 -0700