1B4P

Directly heated sharp-cutoff RF pentode for fixed-gain Class-A amplification in battery receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 4M
Socket code: UX4
Base pins: 4
Nominal heater: 2 V / 60 mA

Description

Directly heated sharp-cutoff RF pentode for Class-A radio-frequency amplification.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 4M
Socket code: UX4
Base pins: 4
Nominal heater voltage: 2 V
Nominal heater current: 60 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

4M - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0006 S
Amplification factor: 550
Max plate voltage: 180 V
Max screen voltage: 67.5 V
Max cathode current: 6 mA

Promoted characteristics use the first listed Class A1 operating condition (90 V plate).

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Tension filament CC ... ... ... ... .. .. .. 2,0 volts
2 V
Tension filament CC ... ... ... ... .. .. .. 2,0 volts
Courant filament ... ... ... .. .. o o .. 0,060 ampére
60 mA
Courant filament ... ... ... .. .. o o .. 0,060 ampére
Tension filament e e e e e e 2,0 2,0 volts
2 V
Tension filament e e e e e e 2,0 2,0 volts
Tension écran ... ... ... .. v e e 67,5 67,5 volts
67.5 V
Tension écran ... ... ... .. v e e 67,5 67,5 volts
Tension grille ... ... ... .. .. . .. —3 —3volts
3 V
Tension grille ... ... ... .. .. . .. —3 —3volts
Courant plaque ... ... ... ... .. .o .. L6 1,7ma,
1.7 ma
Courant plaque ... ... ... ... .. .o .. L6 1,7ma,
Courant écran ... .. PN 0,7 0,6 ma.
0.6 ma
Courant écran ... .. PN 0,7 0,6 ma.

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
5 pF
Section1
Output capacitance
11 pF
Section1
Grid-to-plate capacitance
0.007 pF
Section1

Other

Plate voltage
180 V
ClassA
Screen voltage
67.5 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
1.7 mA
ClassA
Screen current
0.6 mA
ClassA

Characteristic

Plate resistance
1500000 Ω
ClassA
Transconductance
650 µS
ClassA

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Filament Voltage
2 V
Nominal
Filament Current
60 mA
Nominal
Plate Voltage
90 V
ClassA1;PlateVoltage=90V
Screen Voltage
67.5 V
ClassA1;PlateVoltage=90V
Control Grid Voltage
-3 V
ClassA1;PlateVoltage=90V
Plate Current
1.6 mA
ClassA1;PlateVoltage=90V
Screen Current
0.7 mA
ClassA1;PlateVoltage=90V
Plate Voltage
180 V
ClassA1;PlateVoltage=180V
Screen Voltage
67.5 V
ClassA1;PlateVoltage=180V
Control Grid Voltage
-3 V
ClassA1;PlateVoltage=180V
Plate Current
1.7 mA
ClassA1;PlateVoltage=180V
Screen Current
0.6 mA
ClassA1;PlateVoltage=180V

Capacitance

ControlGridToPlateCapacitance
0.007 pF
WithExternalShield;Maximum
Input Capacitance
5 pF
Output Capacitance
11 pF

Characteristic

Plate Resistance
1000000 ohm
ClassA1;PlateVoltage=90V
Transconductance
600 uS
ClassA1;PlateVoltage=90V
Amplification Factor
550
ClassA1;PlateVoltage=90V
ControlGridCutoffVoltage
-8 V
ClassA1;PlateVoltage=90V
Plate Resistance
1500000 ohm
ClassA1;PlateVoltage=180V
Transconductance
650 uS
ClassA1;PlateVoltage=180V
Amplification Factor
1000
ClassA1;PlateVoltage=180V
ControlGridCutoffVoltage
-8 V
ClassA1;PlateVoltage=180V