NJ7P SQL Tube Database Query

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8077
Power Pentode

EIA Base & Outline

Application

Miniature type used as a class C rf amplifier, oscillator and frequency multiplier up to 40 MHz in mobile communications equipment. Requires miniature 9-contact socket.

Mechanical Data

EIA Outline ................................... 6-2
EIA Base ...................................... 9GK

Electrical Data

Heater Voltage ................................ 13.5 V
Heater Current ................................ 0.275 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 10.2 pf
Output ........................................ 3.5 pf
Grid to Plate ................................. 0.063 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 180 V
Plate Dissipation ............................. 5 W
Grid No. 2 Dissipation ........................ 1 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 120 Ω
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 11.5K µ
Plate Current ................................. 19 mA
Grid No. 2 Current ............................ 3.5 mA

Class C Oscillator/Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 115 V
Grid No. 1 Voltage ............................ -7 V
Peak Grid No. 1 Voltage........................ 9 V
Grid No. 1 Current ............................ 0.6 mA
Plate Current ................................. 14.5 mA
Grid No. 2 Current ............................ 3 mA

Class C Oscillator/Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 145 V
Grid No. 1 Voltage ............................ -9 V
Peak Grid No. 1 Voltage........................ 11 V
Grid No. 1 Current ............................ 0.85 mA
Plate Current ................................. 20 mA
Grid No. 2 Current ............................ 4.1 mA

Class C Oscillator/Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 175 V
Grid No. 1 Voltage ............................ -12 V
Peak Grid No. 1 Voltage........................ 16 V
Grid No. 1 Current ............................ 1 mA
Plate Current ................................. 26 mA
Grid No. 2 Current ............................ 5.5 mA

Class C Multiplier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 115 V
Grid No. 1 Voltage ............................ -16 V
Peak Grid No. 1 Voltage........................ 19 V
Grid No. 1 Current ............................ 0.3 mA
Plate Current ................................. 11 mA
Grid No. 2 Current ............................ 2 mA
Driving Power ................................. 0.005 W
Power Output (approx) ......................... 1.4 W

Class C Multiplier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 145 V
Grid No. 1 Voltage ............................ -20 V
Peak Grid No. 1 Voltage........................ 24 V
Grid No. 1 Current ............................ 0.45 mA
Plate Current ................................. 15 mA
Grid No. 2 Current ............................ 3 mA
Driving Power ................................. 0.009 W
Power Output (approx) ......................... 1.9 W

Class C Multiplier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 175 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 31 V
Grid No. 1 Current ............................ 0.6 mA
Plate Current ................................. 20 mA
Grid No. 2 Current ............................ 4 mA
Driving Power ................................. 0.013 W
Power Output (approx) ......................... 2.5 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

Tue, 28 Jun 2022 03:01:15 -0700