NJ7P SQL Tube Database Query

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5678
Pentode

EIA Base & Outline

Application

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

Mechanical Data

Bulb .......................................... T-2 x 3
Base Type ..................................... Inline Subminiature - Full Leads
EIA Outline ................................... 2-1
Maximum Seated Height ......................... 1.515 In.
Maximum Diameter .............................. 0.400 x 0.300 In.
EIA Base ...................................... 1AD4

Electrical Data

Filament Voltage .............................. 1.25 DC V
Filament Current .............................. 0.05 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 3.3 pf
Output ........................................ 3.8 pf
Grid to Plate ................................. 0.01 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 67.5 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -0 V
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 1100 µ
Plate Current ................................. 1.8 mA
Grid No. 2 Current ............................ 0.48 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

Wed, 29 Mar 2023 06:16:26 -0700