NJ7P SQL Tube Database Query

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5DH8
High-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 5BE8 5BR8 5CL8 5
Source ........................................ GE - 1973

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-2
EIA Base ...................................... 9EG

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 5.2 V
Heater Current ................................ 0.6 A

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ GE - 1973
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 2.2 W
Grid No. 2 Dissipation ........................ 0.55 W

Triode
Source ........................................ GE - 1973
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.0 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 390 Ω
Amplification Factor .......................... 53
Plate Resistance (approx) ..................... 12000 Ω
Transconductance .............................. 4400 µ
Plate Current ................................. 7.3 mA

Pentode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 8600 µ
Plate Current ................................. 13.5 mA
Grid No. 2 Current ............................ 3.8 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

Sat, 25 Mar 2023 19:31:54 -0700