NJ7P SQL Tube Database Query

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6947
Medium-Mu Twin Triode

EIA Base & Outline

Application

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

Mechanical Data

EIA Outline ................................... 3-11
EIA Base ...................................... 8DG

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.35 A

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 1.6 pf
Output ........................................ 0.20 pf
Grid to Plate ................................. 1.2 pf

Triode 2
Input ......................................... 1.6 pf
Output ........................................ 0.25 pf
Grid to Plate ................................. 1.2 pf

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 250 V
Plate Dissipation ............................. 0.75 W

Triode 2
Plate Voltage ................................. 250 V
Plate Dissipation ............................. 0.75 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Amplification Factor .......................... 35
Transconductance .............................. 4000 µ
Plate Current ................................. 6.5 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

Fri, 03 Feb 2023 00:12:54 -0700