NJ7P SQL Tube Database Query

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1B4P
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 4MEIA Bulb: 12-6

Substitute Data

Preferred Substitutes ......................... 1B4
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Glass type used as rf amplifier or detector in battery-operated receivers. Requires four-contact socket.

Source ........................................ RCA RC-15 - 1947
This type was made as a pentode (1B4P and a tetrode (1B4T). The 1B4 was a pentode.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... ST-12
Base Type ..................................... Small 4-Pin Socket
EIA Outline ................................... 12-6
EIA Base ...................................... 4M

Electrical Data

Source ........................................ RCA RC-15 - 1947
Filament Voltage .............................. 2.0 DC V
Filament Current .............................. 0.06 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947
Input ......................................... 5.0 pf
Output ........................................ 11.0 pf
Grid to Plate ................................. 0.007 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Negative Grid No. 1 Voltage ................... V
Positive Grid No. 1 Voltage ................... V
Plate Input ................................... W
Plate Dissipation ............................. W
Grid No. 2 Dissipation ........................ W
Cathode Current ............................... mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. Ω
Self Bias .................................. Ω
Bulb Temperature (At Hottest Point) ........... °C

Source ........................................ RCA RC-15 - 1947
For other characteristics and typical operation, see 1E5GP

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Thu, 18 Aug 2022 00:33:51 -0700