NJ7P SQL Tube Database Query

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6K8
Triode - Hexode Converter

EIA Base & Outline

Application

Source ........................................ RCA DS 05/01/41
Metal type used as combined triode oscillator and hexode mixer in radio receivers. Reqires octal socket and may be mounted in any position.

Mechanical Data

Source ........................................ RCA DS 05/01/41
Bulb .......................................... MT-8
EIA Outline ................................... 8-2
EIA Base ...................................... 8K

Electrical Data

Source ........................................ RCA DS 05/01/41
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Triode-Hexode
Source ........................................ RCA DS 05/01/41
Hexode Grid No. 3 to Hexode Plate ............. 0.03 pf
Hexode Grid No. 3 to Triode Plate ............. 0.02 pf
Hexode Grid No. 3 to Hexode Grid No. 1 ........ 0.2 pf
Hexode Grid No. 1 to Triode Plate ............. 1.1 pf
Hexode Grid No. 1 to Hexode Plate ............. 0.1 pf
Hexode Grid No. 3 to All (RF Input) ........... 6.6 pf
Triode Plate to All Except G1 (Osc Output) .... 3.2 pf
Grid No. 1 to All Except Triode P (Osc Input) . 6.0 pf
Hexode Plate to All (Mixer Output) ............ 3.5 pf

Maximum Ratings (Design Center Values)

Triode-Hexode
Source ........................................ RCA DS 05/01/41
Hexode Plate Voltage .......................... 300 V
Grid No. 2 &4 Voltage (Screen) ................ 150 V
Grid No. 2 & 4 Supply Voltage (Screen) ........ 300 V
Grid No. 1 Voltage ............................ 0 V
Triode Plate Voltage .......................... 125 V
Hexode Plate Dissipation ...................... 0.75 W
Grid No. 2 & 4 Dissipation (Screen) ........... 0.7 W
Triode Plate Dissipation ...................... 0.75 W
Cathode Current ............................... 16 mA

Characteristics and Typical Operation

Converter
Source ........................................ RCA DS 05/01/41
Hexode Plate Voltage .......................... 100 V
Hexode Grid No. 2 & 4 Voltage (Screen) ........ 100 V
Hexode Grid No. 1 Voltage ..................... -3.0 V
Triode Plate Voltage .......................... 100 V
Triode Grid No. 1 Resistor .................... 50K Ω
Hexode Plate Resistance (approx) .............. 400K Ω
Hexode Conversion Transconductance ............ 325 µ
Hexode Plate Current .......................... 2.3 mA
Hexode Grid No. 2 & 4 Current (Screen) ........ 6.2 mA
Triode Plate Current .......................... 3.8 mA
Grid No. 1 Current ............................ 0.15 mA
Total Cathode Current ......................... 12.5 mA

Converter
Source ........................................ RCA DS 05/01/41
Hexode Plate Voltage .......................... 250 V
Hexode Grid No. 2 & 4 Voltage (Screen) ........ 100 V
Hexode Grid No. 1 Voltage ..................... -3.0 V
Triode Plate Voltage .......................... 100 V
Triode Grid No. 1 Resistor .................... 50K Ω
Hexode Plate Resistance (approx) .............. 600K Ω
Hexode Conversion Transconductance ............ 350 µ
Hexode Plate Current .......................... 2.5 mA
Hexode Grid No. 2 & 4 Current (Screen) ........ 6.0 mA
Triode Plate Current .......................... 3.8 mA
Grid No. 1 Current ............................ 0.15 mA
Total Cathode Current ......................... 12.5 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 19:26:29 -0700