NJ7P SQL Tube Database Query

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6CF8
Low Noise Pentode

EIA Base & Outline

EIA Base: 9BJEIA Bulb: 6-10
Source ........................................ Sylvania - 1959

Application

Source ........................................ Sylvania - 1959
Miniature type is a low noise, low microphonic pentode used in the early stages of high gain amplifiers. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ Sylvania - 1959
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-10
EIA Base ...................................... 9BJ

Electrical Data

Source ........................................ Sylvania - 1959
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.2 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ Sylvania - 1959
Input ......................................... 4.0 pf
Output ........................................ 5.5 pf
Grid to Plate ................................. 0.025 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ Sylvania - 1959
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Plate Dissipation ............................. 1.0 W
Grid No. 2 Dissipation ........................ 0.2 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ Sylvania - 1959
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 140 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 38
Plate Resistance (approx) ..................... 2.5M Ω
Transconductance .............................. 1800 µMho
Plate Current ................................. 3.0 mA
Grid No. 2 Current ............................ 0.6 mA

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Tue, 04 Oct 2022 15:31:33 -0700