NJ7P SQL Tube Database Query

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85
Twin Diode - Medium-Mu Triode

EIA Base & Outline

Application

Glass type used as a combined detector, amplifier and avc tube. Requires six-contact socket.

Mechanical Data

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

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 1.5 pf
Output ........................................ 4.3 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 250 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. 1 Voltage ............................ -20 V
Amplification Factor .......................... 8.3
Plate Resistance (approx) ..................... 7.5K Ω
Transconductance .............................. 1100 µ
Plate Current ................................. 8.0 mA
Load Resistance ............................... 20K Ω
Power Output (approx) ......................... 0.85 W

Class A Amplifier
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -13.5 V
Amplification Factor .......................... 8.3
Plate Resistance (approx) ..................... 8.5K Ω
Transconductance .............................. 975 µ
Plate Current ................................. 6.0 mA
Load Resistance ............................... 20K Ω
Power Output (approx) ......................... 0.16 W

Class A Amplifier
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -10.5 V
Amplification Factor .......................... 8.3
Plate Resistance (approx) ..................... 11K Ω
Transconductance .............................. 750 µ
Plate Current ................................. 3.7 mA
Load Resistance ............................... 15K Ω
Power Output (approx) ......................... 0.075 W

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, 04 Oct 2022 19:13:02 -0700