NJ7P SQL Tube Database Query

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A horizontal ribbon.

12DL8
Twin Diode - Power Tetrode

EIA Base & Outline

EIA Base: 9HREIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 12DV8
Substitutes ................................... 12DS7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-3
EIA Base ...................................... 9HR
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 10-16 V
Heater Current ................................ 0.55 A

Direct Interelectrode Capacitances (approx)

Diode
Source ........................................ ARRL HB - 1964
Output ........................................ 1.6 pf

Tetrode
Source ........................................ ARRL HB - 1964
Input ......................................... 12 pf
Output ........................................ 1.3 pf
Grid to Plate ................................. 14 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 12.6 V
Grid No. 2 Voltage ............................ -2.0 V
Grid No. 1 Voltage ............................ 12.6 V
Amplification Factor .......................... 7.2
Plate Resistance (approx) ..................... 480 Ω
Transconductance .............................. 15K µMho
Plate Current ................................. 40 mA
Grid No. 2 Current ............................ 75 mA

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Tue, 29 Nov 2022 21:41:11 -0700