NJ7P SQL Tube Database Query

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A horizontal ribbon.

12FX8
Medium-Mu Triode - Pentagrid Converter

EIA Base & Outline

EIA Base: 9KV

Mechanical Data

Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
Maximum Overall Height ........................ 2-7/16 In.
Maximum Seated Height ......................... 2-3/16 In.
Maximum Diameter .............................. 7/8 In.
EIA Base ...................................... 9KV
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 10-16 V
Heater Current ................................ 0.27 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 2.2 pf
Output ........................................ 0.25 pf
Grid to Plate ................................. 1.3 pf

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 12.6 V
Grid No. 1 Voltage ............................ -0.8 V
Amplification Factor .......................... 10
Transconductance .............................. 1400 µMho
Plate Current ................................. 0.29 mA

Pentagrid Converter
Plate Voltage ................................. 12.6 V
Grid No. 2 Voltage ............................ 12.6 V
Grid No. 1 Voltage ............................ -0.5 V
Plate Resistance (approx) ..................... 500K Ω
Transconductance .............................. 300 µMho
Plate Current ................................. 0.29 mA
Grid No. 2 Current ............................ 1.25 mA

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A horizontal ribbon.

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Fri, 19 Aug 2022 23:33:34 -0700