NJ7P SQL Tube Database Query

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5639
Semiremote-Cutoff Pentode

EIA Base & Outline

Application

Subminiature type used as a video amplifier. Requires either a subminiature socket or direct soldering of the wires from the tube to circuit components.

Mechanical Data

EIA Outline ................................... 3-3
EIA Base ...................................... 8DE

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 9.5 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 0.1 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 165 V
Grid No. 2 Voltage ............................ 155 V
Plate Dissipation ............................. 3.8 W
Grid No. 2 Dissipation ........................ 1.0 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 9000 µ
Plate Current ................................. 21 mA
Grid No. 2 Current ............................ 4 mA

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

Thu, 29 Sep 2022 01:38:14 -0700