NJ7P SQL Tube Database Query

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6540
Sharp-Cutoff Pentode

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 ................................... 3-6
EIA Base ...................................... 5702

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.2 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 4.8 pf
Output ........................................ 3.5 pf
Grid to Plate ................................. 0.03 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 165 V
Grid No. 2 Voltage ............................ 155 V
Plate Dissipation ............................. 1.1 W
Grid No. 2 Dissipation ........................ 0.4 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 120 V
Grid No. 2 Voltage ............................ 120 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Amplification Factor .......................... 54
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 5000 µ
Plate Current ................................. 7.5 mA
Grid No. 2 Current ............................ 2.6 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

Tue, 28 Jun 2022 02:18:41 -0700