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Power - Pentode (NOT beam) ·Pentode

47

Classic directly heated audio power pentode for single-ended and push-pull receiver output stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
5B
Socket code
UX5
Base pins
5
Nominal heater
2.5 V / 1.75 A

Description

Directly heated power pentode for audio-output service, including single-ended and push-pull operation.

Socket description

Small 5-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
5B
Socket code
UX5
Base pins
5
Nominal heater voltage
2.5 V
Nominal heater current
1.75 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

5B - 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
60000 Ω
Transconductance
0.0025 S
Amplification factor
150
Max plate voltage
250 V
Max screen voltage
250 V
Max cathode current
37 mA

Maximum ratings and Class A characteristics mapped from the printed tables.

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

1932 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Grid-plate capacitance

    1.25 pF

    Published direct interelectrode capacitance

  • Undistorted power output

    2500 mW

    Published operating characteristic

  • Load resistance

    7000 ohm

    Published operating characteristic

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    250 V

    ClassA

  • Grid Voltage

    -16.5 V

    ClassA

  • Plate Current

    31 mA

    ClassA

  • Screen Current

    6 mA

    ClassA

  • Load Resistance

    7000 ohm

    ClassA

  • Power Output

    2.7 W

    ClassA

Data set 03

193X Cunningham

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater/filament voltage

    2.5 V

    Published nominal

  • Heater/filament current

    1.75 A

    Published nominal

  • Transconductance

    2500 uS

    Published characteristic

Data set 04

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    2.5 V

    Nominal

  • HeaterCurrentNominal

    1.75 A

    Nominal

  • Maximum Plate Voltage

    250 V

  • Maximum Screen Voltage

    250 V

  • Maximum Cathode Current

    37 mA

Characteristic

  • Transconductance

    2500 µS

    Typical

  • Amplification Factor

    150

    Typical

  • Plate Resistance

    60000 ohm

    Typical

Data set 05

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

  • Plate Current

    31 mA

  • Screen Voltage

    250 V

  • Screen Current

    6 mA

  • Control Grid Voltage

    -16.5 V

  • Optimum Load

    7000 ohm

  • Power Output

    2.7 W

Characteristic

  • Plate Resistance

    60000 ohm

  • Transconductance

    2500 µS

Data set 06

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Transconductance

    2500 µS

Other

  • Operating Mode

    Single-ended or push-pull audio output

Data set 07

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    250 V

    ClassA

  • Grid Voltage

    -16.5 V

    ClassA

  • Plate Current

    31 mA

    ClassA

  • Screen Current

    6 mA

    ClassA

  • Load Resistance

    7000 ohm

    ClassA

  • Power Output

    2.7 W

    ClassA

Data set 08

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Power Output

    2.7 W

    ClassA

Data set 09

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    250 V

    ClassA

  • Screen Voltage

    250 V

    ClassA

  • Plate Current

    31 mA

    ClassA

  • Screen Current

    6 mA

    ClassA

  • Load Resistance

    7000 ohm

    ClassA

  • Total Harmonic Distortion

    6 %

    ClassA

  • Power Output

    2.7 W

    ClassA