NJ7P SQL Tube Database Query

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6BD4
Sharp-Cutoff Beam Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BK4
Source ........................................ TungSol DC 05/01/54

Application

Source ........................................ TungSol DC 05/01/54
Glass octal type used as shunt voltage regulator in Television high-voltage power supplies. Requires octal socket.

Mechanical Data

Source ........................................ TungSol DC 05/01/54
Bulb .......................................... T-12
Base Type ..................................... Short Jumbo Shell Octal
Maximum Overall Height ........................ 5.125 In.
Maximum Seated Height ......................... 4.625 In.
Maximum Diameter .............................. 1.719 In.
EIA Base ...................................... 8FU
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ TungSol DC 05/01/54
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 180 V
Heater Negative with Respect to Cathode
DC Component ............................ 180 V

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ TungSol DC 05/01/54
Input ......................................... 3.8 pf
Output ........................................ 0.04 pf
Grid to Plate ................................. 1.0 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ TungSol DC 05/01/54
Plate Voltage (Absolute Max) .................. 20000 V
Negative DC Grid No. 1 Voltage ................ 125 V
Peak Negative Grid No. 1 Voltage .............. 550 V
Plate Dissipation (Absolute Max) .............. 20 W
DC Plate Current (Absolute Max) ............... 1.5 mA
Grid No. 1 Circuit Resistance ................. 3M Ω

Characteristics and Typical Operation

Shunt Regulator
Source ........................................ TungSol DC 05/01/54
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

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, 21 Mar 2023 03:16:19 -0700