NJ7P SQL Tube Database Query

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6BD4A
Sharp-Cutoff Beam Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BK4
Source ........................................ TungSol

Application

Source ........................................ TungSol
Glass octal type used as shunt voltage regulator in Television high-voltage power supplies. Requires octal socket.

Mechanical Data

Source ........................................ TungSol
Bulb .......................................... T-12
Base Type ..................................... Short Jumbo Shell Octal 6-Pin
Maximum Overall Height ........................ 5.125 In.
Maximum Seated Height ......................... 4.625 In.
Maximum Diameter .............................. 1.719 In.
EIA Base ...................................... 8FU

Electrical Data

Source ........................................ TungSol
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 A
Maximum Heater-Cathode Voltage
Heater Negative with Respect to Cathode
DC Component ............................ Coated Unipotential V
Total DC and Peak ....................... Any V

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ TungSol
Input ......................................... 3.8 pf
Output ........................................ 0.04 pf
Grid to Plate ................................. 1.0 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ TungSol
Plate Voltage (Absolute Max) .................. 27000 V
Negative DC Grid No. 1 Voltage ................ 125 V
Peak Negative Grid No. 1 Voltage .............. 550 V
Plate Dissipation (Absolute Max) .............. 25 W
DC Plate Current (Absolute Max) ............... 1.5 mA
Grid No. 1 Circuit Resistance ................. 4M Ω

Characteristics and Typical Operation

Shunt Regulator
Source ........................................ TungSol
Unregulated DC Supply Voltage ................. 29800 V
Equivalent Resistance of Unregulated Supply ... 8M Ω
DC Reference Voltage .......................... 500 V
Equivalent Resistance of Reference Supply ..... 1K Ω
Effective Grid-Plate Transconductance ......... 158 µ
DC Plate Current for Zero Load Current ........ 1055 µa
DC Plate Current for Load Current of 1 mA ..... 100 µa
Regulated DC Output Voltage (0 mA Load) ....... 20000 V
Regulated DC Output Voltage (1 mA Load) ....... 19800 V

Shunt Regulator
Source ........................................ TungSol
Unregulated DC Supply Voltage ................. 36300 V
Equivalent Resistance of Unregulated Supply ... 8M Ω
DC Reference Voltage .......................... 500 V
Equivalent Resistance of Reference Supply ..... 1K Ω
Effective Grid-Plate Transconductance ......... 116 µ
DC Plate Current for Zero Load Current ........ 1035 µa
DC Plate Current for Load Current of 1 mA ..... 100 µa
Regulated DC Output Voltage (0 mA Load) ....... 27000 V
Regulated DC Output Voltage (1 mA Load) ....... 26500 V

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 Mar 2023 23:15:14 -0700