NJ7P SQL Tube Database Query

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6SJ7
Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 6AB7 6AC7 6AJ7
Source ........................................ RCA RC-15 - 1947

Application

Metal type as rf amplifiers and biased detectors. As a detector, it is capable of delivering large audio-frequency output voltage with a relatively small input voltage. Requires octal socket and may be mounted in any position.

Mechanical Data

Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 8-Pin
EIA Outline ................................... 8-1
EIA Base ...................................... 8N
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 90 V
Heater Negative with Respect to Cathode
DC Component ............................ 90 V

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 6 pf
Output ........................................ 7 pf
Grid to Plate ................................. 0.005 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 300 V
Grid No. 2 Supply Voltage ..................... 300 V
Grid No. 2 Voltage ............................ 125 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.5 W
Grid No. 2 Dissipation ........................ 0.7 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... >1M Ω
Transconductance .............................. 1650 µ
Plate Current ................................. 3 mA
Grid No. 2 Current ............................ 0.8 mA

Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 700K Ω
Transconductance .............................. 1575 µ
Plate Current ................................. 2.9 mA
Grid No. 2 Current ............................ 0.9 mA

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -8.5 V
Amplification Factor .......................... 19
Plate Resistance (approx) ..................... 7600 Ω
Transconductance .............................. 2500 µ
Plate Current ................................. 9.2 mA

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -6 V
Amplification Factor .......................... 19
Plate Resistance (approx) ..................... 8250 Ω
Transconductance .............................. 2300 µ
Plate Current ................................. 6.0 mA

Notes

1. Grid number 1 and number 3 connected to the plate for triode connection.

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

Tue, 09 Aug 2022 07:44:51 -0700