NJ7P SQL Tube Database Query

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6CX8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6AU8 6BH8
Substitutes ................................... 6JL8 6KR8 6BL8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in television receiver applications. Pentode used as video amplifier; triode used as sound if amplifier, sweep-oscillator, sync-separator, sync-amplifier and sync-clipper circuits. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-3
EIA Base ...................................... 9DX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.75 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 9 pf
Output ........................................ 4.4 pf
Grid to Plate ................................. 0.06 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.2 pf
Output ........................................ 0.38 pf
Grid to Plate ................................. 4.4 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 5 W
Grid No. 2 Dissipation ........................ 1.1 W

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 8.7K Ω
Transconductance .............................. 4600 µ
Plate Current ................................. 9.2 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Plate Resistance (approx) ..................... 70K Ω
Transconductance .............................. 10k µ
Plate Current ................................. 24 mA
Grid No. 2 Current ............................ 5.2 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

Wed, 29 Mar 2023 02:28:23 -0700