NJ7P SQL Tube Database Query

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1T4
Remote-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 1L4
Substitutes ................................... 1U4
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Miniature type used in lightweight, compact, portable, battery-operated receivers as rf or if amplifier. Requires miniature 7-contact socket and may be mounted in any position.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-5 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 5-2
EIA Base ...................................... 6AR
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Filament Voltage .............................. 1.4 DC V
Filament Current .............................. 0.05 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947
Input ......................................... 3.6 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 0.01 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 500K Ω
Transconductance .............................. 900 µ
Plate Current ................................. 3.5 mA
Grid No. 2 Current ............................ 1.4 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 45 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 800K Ω
Transconductance .............................. 750 µ
Plate Current ................................. 1.8 mA
Grid No. 2 Current ............................ 0.65 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 67.5 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 250K Ω
Transconductance .............................. 875 µ
Plate Current ................................. 3.4 mA
Grid No. 2 Current ............................ 1.5 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 45 V
Grid No. 2 Voltage ............................ 45 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 350K Ω
Transconductance .............................. 700 µ
Plate Current ................................. 1.7 mA
Grid No. 2 Current ............................ 0.7 mA

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

Wed, 29 Mar 2023 02:42:49 -0700