NJ7P SQL Tube Database Query

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78
Remote-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6D6
Substitutes ................................... 58
Source ........................................ RCA RC-13 - 1937

Application

Glass type used in rf and if stages of radio receivers. Requires six-contact socket.

Mechanical Data

Bulb .......................................... ST-12
Base Type ..................................... Small 6-Pin
EIA Outline ................................... 12-6
EIA Base ...................................... 6F
Top Cap ....................................... Small Metal
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 4.5 pf
Output ........................................ 11.0 pf
Grid to Plate ................................. 0.007 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Cathode Current ............................... mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. Ω
Self Bias .................................. Ω
Bulb Temperature (At Hottest Point) ........... °C

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 990
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 1650 µ
Plate Current ................................. 10.5 mA
Grid No. 2 Current ............................ 2.6 mA

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1160
Plate Resistance (approx) ..................... 800K Ω
Transconductance .............................. 1450 µ
Plate Current ................................. 7.0 mA
Grid No. 2 Current ............................ 1.7 mA

Class A Amplifier
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 75 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1100
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 1100 µ
Plate Current ................................. 4.0 mA
Grid No. 2 Current ............................ 1.0 mA

Class A Amplifier
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 400
Plate Resistance (approx) ..................... 315K Ω
Transconductance .............................. 1275 µ
Plate Current ................................. 5.4 mA
Grid No. 2 Current ............................ 1.3 mA

Mixer Oscillator Inj = 7V
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -10 V

For other characteristics and typical operation, see 6K7

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

Sat, 02 Jul 2022 06:43:38 -0700