NJ7P SQL Tube Database Query

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6CQ8
Medium-Mu Triode - Sharp-Cutoff Tetrode

EIA Base & Outline

Substitute Data

Substitutes ................................... 6EA8 6GH8 6LM8 6U8
Source ........................................ RCA RC-27 - 1973

Application

Source ........................................ RCA RC-27 - 1973
Miniature type used in color and black-and-white television receiver applications. The tetrode is used as a mixer, video if amplifier or sound if amplifier.

Source ........................................ RCA RC-27 - 1973
The triode is used as a vhf oscillator, phase-splitter, sync-clipper, sync-separator, and rf amplifier circuits. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-27 - 1973
Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9GE
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-27 - 1973
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Tetrode
Source ........................................ RCA RC-27 - 1973
Input ......................................... 5 pf
Output ........................................ 2.5 pf
Grid to Plate ................................. 0.019 pf

Triode
Source ........................................ RCA RC-27 - 1973
Input ......................................... 2.7 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Tetrode
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.2 W
Grid No. 2 Dissipation ........................ 0.7 W

Triode
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 3.1 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 5K Ω
Transconductance .............................. 8000 µ
Plate Current ................................. 15 mA

Tetrode Class A Amplifier
Source ........................................ RCA RC-27 - 1973
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 140K Ω
Transconductance .............................. 5800 µ
Plate Current ................................. 12 mA
Grid No. 2 Current ............................ 4.2 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

Thu, 02 Feb 2023 03:42:39 -0700