NJ7P SQL Tube Database Query

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5905
Sharp-Cutoff Pentode

EIA Base & Outline

Application

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

Mechanical Data

EIA Outline ................................... 3-1
EIA Base ...................................... 8DL

Electrical Data

Heater Voltage ................................ 26.5 V
Heater Current ................................ 0.045 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 4.4 pf
Output ........................................ 3.4 pf
Grid to Plate ................................. 0.015 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 55 V
Grid No. 2 Voltage ............................ 55 V

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 26.5 V
Grid No. 2 Voltage ............................ 26.5 V
Grid No. 1 Voltage ............................ -0 V
Plate Resistance (approx) ..................... 110K Ω
Transconductance .............................. 2850 µ
Plate Current ................................. 2.1 mA
Grid No. 2 Current ............................ 0.9 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

Sat, 25 Jun 2022 10:24:12 -0700