NJ7P SQL Tube Database Query

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

7905
Beam Power Pentode

EIA Base & Outline

Application

Miniature quick-heating-filament beam power tube for use as rf oscillator, amplifier and frequency multiplier in mobile communications equipment. Require miniature 9-contact socket.

Mechanical Data

EIA Outline ................................... 6-3
EIA Base ...................................... 9PB

Electrical Data

Filament Voltage .............................. 6.3 V
Filament Current .............................. 0.65 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 8.5 pf
Output ........................................ 0.14 pf
Grid to Plate ................................. 5.5 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 1.5 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 185 V
Grid No. 1 Voltage ............................ -6 V
Transconductance .............................. 6700 µ
Plate Current ................................. 36 mA
Grid No. 2 Current ............................ 2.5 mA

Class C Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 185 V
Grid No. 1 Voltage ............................ -39 V
Peak Grid No. 1 Voltage........................ 43 V
Grid No. 1 Current ............................ 2.2 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 4 mA
Driving Power ................................. 1.0 W
Power Output (approx) ......................... 7 W

Class C Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 165 V
Grid No. 1 Voltage ............................ -36 V
Peak Grid No. 1 Voltage........................ 41 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 2.5 mA
Driving Power ................................. 1.0 W
Power Output (approx) ......................... 5.5 W

Class C Modulated Amplifier (Plate)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -70 V
Peak Grid No. 1 Voltage........................ 75 V
Grid No. 1 Current ............................ 2.1 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 2.5 mA
Driving Power ................................. 1.0 W
Power Output (approx) ......................... 6.5 W

Class C Multiplier (2X)
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 215 V
Grid No. 1 Voltage ............................ -80 V
Peak Grid No. 1 Voltage........................ 87 V
Grid No. 1 Current ............................ 1.5 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 3.4 mA
Driving Power ................................. 0.5 W
Power Output (approx) ......................... 3.5 W

Class C Multiplier (2X)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -53 V
Peak Grid No. 1 Voltage........................ 60 V
Grid No. 1 Current ............................ 1 mA
Plate Current ................................. 45 mA
Grid No. 2 Current ............................ 3.4 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 2.5 W

Class C Multiplier (3X)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -90 V
Peak Grid No. 1 Voltage........................ 105 V
Grid No. 1 Current ............................ 1.8 mA
Plate Current ................................. 40 mA
Grid No. 2 Current ............................ 2.5 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 1.4 W

Class C Multiplier (3X)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 225 V
Grid No. 1 Voltage ............................ -108 V
Peak Grid No. 1 Voltage........................ 118 V
Grid No. 1 Current ............................ 1.8 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 3.4 mA
Driving Power ................................. 0.6 W
Power Output (approx) ......................... 2.0 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, 02 Jul 2022 07:35:02 -0700