NJ7P SQL Tube Database Query

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6CR8
Medium-Mu Triode - Pentode

EIA Base & Outline

EIA Base: 9GJEIA Bulb: 6-2

Substitute Data

Substitutes ................................... 6CS8 6KZ8
Source ........................................ GE - 1973

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-2
EIA Base ...................................... 9GJ

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ GE - 1973
Input ......................................... 6 pf
Output ........................................ 2.8 pf
Grid to Plate ................................. 0.018 pf

Triode
Source ........................................ GE - 1973
Input ......................................... 2 pf
Output ........................................ 1.4 pf
Grid to Plate ................................. 1.6 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 2.3 W
Grid No. 2 Dissipation ........................ 0.55 W

Triode
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.75 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 125 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 22
Plate Resistance (approx) ..................... 5.5K Ω
Transconductance .............................. 4000 µMho
Plate Current ................................. 12 mA

Pentode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Plate Resistance (approx) ..................... 300K Ω
Transconductance .............................. 7700 µMho
Plate Current ................................. 13 mA
Grid No. 2 Current ............................ 3 mA

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Thu, 18 Aug 2022 11:05:25 -0700