NJ7P SQL Tube Database Query

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3Q4
Power Pentode

EIA Base & Outline

EIA Base: 7BAEIA Bulb: 5-2

Substitute Data

Preferred Substitutes ......................... 3W4
Substitutes ................................... 3A4 3Z4
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Miniature type used in output stage of lightweight, compact, portable, battery-operated equipment. Requires miniature 7-contact socket. Except for basing, it is identical to 3V4.

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 1.4/2.8 DC V
Heater Current ................................ 0.1/0.05 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947
Input ......................................... 5.5 pf
Output ........................................ 3.8 pf
Grid to Plate ................................. 0.2 pf

Maximum Ratings (Design Center Values)

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

Source ........................................ RCA RC-15 - 1947
For other characteristics and typical operation, see 3V4

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Thu, 18 Aug 2022 18:53:13 -0700