NJ7P SQL Tube Database Query

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5B8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9EC
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 4.7 V
Heater Current ................................ 0.6 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ GE - 1973
Input ......................................... 6 pf
Output ........................................ 2.6 pf
Grid to Plate ................................. 0.06 pf

Triode
Source ........................................ GE - 1973
Input ......................................... 1.9 pf
Output ........................................ 1.4 pf
Grid to Plate ................................. 1.7 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ GE - 1973
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 2.0 W
Grid No. 2 Dissipation ........................ 0.5 W

Triode
Source ........................................ GE - 1973
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 200 V
Grid No. 1 Voltage ............................ -6 V
Amplification Factor .......................... 19
Plate Resistance (approx) ..................... 5750 Ω
Transconductance .............................. 3300 µ
Plate Current ................................. 13 mA

Pentode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 300K Ω
Transconductance .............................. 6200 µ
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 2.8 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, 04 Oct 2022 15:52:14 -0700