NJ7P SQL Tube Database Query

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12F8
Twin Diode - Remote-Cutoff Pentode

EIA Base & Outline

EIA Base: 9FHEIA Bulb: 6-2
Source ........................................ ARRL HB - 1964

Application

Source ........................................ ARRL HB - 1964
Miniature type used a combined detector and audio amplifier. This tube is designed to operate where heater and plate voltage ar supplied directly from a 12 volt battery. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ ARRL HB - 1964
Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9FH
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 10-16 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ ARRL HB - 1964
Input ......................................... 4.5 pf
Output ........................................ 3 pf
Grid to Plate ................................. 0.06 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 30 V
Grid No. 2 Voltage ............................ 30 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 12.6 V
Grid No. 2 Voltage ............................ 12.6 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 333K Ω
Transconductance .............................. 1000 µMho
Plate Current ................................. 1 mA
Grid No. 2 Current ............................ 0.38 mA

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Wed, 30 Nov 2022 04:39:46 -0700