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Voltage Pentode - High Frequency (single) ·Pentode

951

Directly heated high-frequency amplifier pentode, explicitly co-designated 1B4/951 in RCA documentation. Its filamentary cathode and RF amplifier role suit low-voltage high-frequency signal equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
4
Nominal heater
2 V / 60 mA

Description

951 is a Pentode device. Directly heated pentode high-frequency amplifier; the supplied sheet is explicitly co-designated 1B4/951.

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
-
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

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
1800000 Ω
Transconductance
0.00065 S
Max plate voltage
180 V
Max screen voltage
67.5 V

Directly heated pentode high-frequency amplifier; the supplied sheet is explicitly co-designated 1B4/951.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    90 V

    ClassA

  • Screen voltage

    67.5 V

    ClassA

  • Grid bias

    -3 V

    ClassA

  • Plate current

    1.6 mA

    PlateVoltage=90V

  • Screen current

    0.7 mA

    PlateVoltage=90V

  • Plate voltage

    180 V

    ClassA

  • Plate current

    1.7 mA

    PlateVoltage=180V

  • Screen current

    0.6 mA

    PlateVoltage=180V

Characteristic

  • Plate resistance

    1 MOhm

    PlateVoltage=90V

  • Transconductance

    600 uS

    PlateVoltage=90V

  • Plate resistance

    1.8 MOhm

    PlateVoltage=180V

  • Transconductance

    650 uS

    PlateVoltage=180V

  • Grid bias for plate-current cutoff

    -8 V

Capacitance

  • Grid-to-plate capacitance

    - to 0.007 pF

    WithTubeShield; Maximum

  • Input capacitance

    5 pF

  • Output capacitance

    11 pF