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Voltage Pentode - High Frequency (single) ·Pentode

1B4951

Directly heated high-frequency RF amplifier pentode.

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

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
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 0

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Transconductance
0.0006 S
Amplification factor
600
Max plate voltage
180 V
Max screen voltage
67.5 V

At Va 90 V, screen 67.5 V: gm 600 µS, rp 1 MΩ, μ 600; at Va 180 V: gm 650 µS, rp 1.8 MΩ, μ 975.

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 0

Pentode

Characteristics

  • Grid-to-plate capacitance

    0.007 pF

    Grid to plate, shielded

  • Input capacitance

    5 pF

    Input

  • Output capacitance

    11 pF

    Output capacitance

Other

  • Plate voltage

    90 V

    Class A operating point 1; screen 67.5 V

  • Plate voltage

    180 V

    Class A operating point 2; screen 67.5 V

  • Heater/filament current

    60 mA

    Filament current

  • Heater/filament voltage

    2 V

    Filament voltage