NJ7P SQL Tube Database Query

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6CG8A
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6FG7 6LJ8
Substitutes ................................... 6AT8 6BE8 6BR8 6CL8 6FV8 6JN8 6BM8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as combined oscillator and mixer tube in color and black-and-white television receivers utilizing an intermediate frequency in the order of 40 MHz. When used in an AM/FM receiver,

Source ........................................ RCA RC-29 - 1975
the triode is used as an oscillator for both sections. In the AM section, the pentode is used as a high-gain pentode mixer; in the FM section, the pentode is used either as a pentode mixer

Source ........................................ RCA RC-29 - 1975
or as a triode-connected mixer depending on signal-to-noise considerations. Requires miniature 9-contact socket. Except for interelectrode capacirtances, this type is identical to 6X8.

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 4.8 pf
Output ........................................ 0.9 pf
Grid to Plate ................................. 0.03 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.6 pf
Output ........................................ 0.05 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 275 V
Grid No. 2 Voltage ............................ 275 V
Plate Dissipation ............................. 2.3 W
Grid No. 2 Dissipation ........................ 0.45 W

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 275 V
Plate Dissipation ............................. 1.7 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 6.9K Ω
Transconductance .............................. 5800 µ
Plate Current ................................. 8.5 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Plate Resistance (approx) ..................... 750K Ω
Transconductance .............................. 4600 µ
Plate Current ................................. 7.7 mA
Grid No. 2 Current ............................ 1.6 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

Sun, 26 Jun 2022 03:43:53 -0700