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Power - Pentode (NOT beam) ·Pentode

E55L

Special-quality long-life power/output pentode designed for stable professional, industrial, or wideband amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
NOVAL
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 600 mA

Description

Special-quality high-slope wideband output pentode for stable long-life industrial service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
NOVAL
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

NOVAL - 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
20000 Ω
Transconductance
0.045 S
Amplification factor
30
Max plate voltage
200 V
Max screen voltage
250 V
Max plate dissipation
10 W
Max screen dissipation
2.5 W

Special-quality shock- and vibration-resistant long-life wide-band output pentode for professional equipment.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Plate voltage characteristic

    125 V

  • Screen voltage characteristic

    125 V

  • Control-grid voltage

    -3 V

  • Plate current

    50 mA

  • Screen current

    5.5 mA

  • Transconductance

    45 mA/V

  • Plate resistance

    20 kohm

  • Triode-connected plate voltage

    125 V

  • Triode-connected plate current

    55.5 mA

  • Triode-connected transconductance

    50 mA/V

  • Triode-connected amplification factor

    30

Other

  • Plate operating voltage

    140 V

  • Screen operating voltage

    140 V

  • Cathode resistor

    270 ohm

Capacitance

  • Shielded plate-grid capacitance max

    0.12 pF

  • Shielded input capacitance

    18 pF

  • Shielded output capacitance max

    7.2 pF

  • Triode-connected plate-grid capacitance avg

    6.2 pF

  • Triode-connected input capacitance avg

    11.8 pF

  • Triode-connected output capacitance avg

    10.5 pF

Data set 02

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    125 V

    Pentode

  • Plate current

    50 mA

    Pentode

  • Screen current

    5.5 mA

    Pentode

  • Plate voltage

    125 V

    TriodeConnection

  • Plate current

    55.5 mA

    TriodeConnection

Characteristic

  • Transconductance

    45000 uS

    Pentode

  • Transconductance

    50000 uS

    TriodeConnection

  • Amplification factor

    30

    TriodeConnection

Capacitance

  • Grid capacitance

    18 pF

    Pentode

  • Plate capacitance

    4 pF

    Pentode

Data set 03

1963 Philips Electron Tubes Handbook V3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater current

    600 mA

    If = 600 mA

Capacitance

  • Grid capacitance

    1 pF

    Cg1 = 18 pF 18 pF

  • Cathode current

    55.5 mA

    Cg1(Ik=55.5 mA)= 28 pF 28 pF

  • Grid capacitance

    1 pF

    Cg1(Ik=55.5 mA)= 28 pF 28 pF

  • Plate capacitance

    4 pF

    Ca = 4 pF 6 pF

  • Grid-to-plate capacitance

    0.11 pF

    Cag1 = 0.11 pF 0.08 pF

  • Grid-to-plate capacitance

    1 pF

    Cag1 = 0.11 pF 0.08 pF

Other

  • Plate voltage

    125 V

    Va 125V

  • Grid-3 voltage

    0 V

    Vg3 = 0 V

  • Plate current

    50 mA

    Ia = 50 mA

  • Transconductance

    45 mA/V

    S = 45 mA/V

  • Plate current

    55.5 mA

    Ia = 55.5 mA

  • Transconductance

    50 mA/V

    S = 50 mA/V

  • Amplification factor

    30

    µ = 30

  • Plate supply voltage

    140 V

    Vba = 140V

  • Cathode resistor

    270 ohm

    Rk = 270Q

  • Plate voltage

    -125 V

    (mA/V) Va -125V IQ

  • Transconductance

    50 mA/V

    60 S 50

Data set 04

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    6.3 V

    Published datasheet value

  • Heater current

    600 mA

    Published datasheet value

Characteristics

  • Anode current

    50 mA

    Published datasheet value

  • Anode current

    52 mA

    Published datasheet value

  • Anode current

    55.5 mA

    Published datasheet value

  • Anode voltage

    125 V

    Published datasheet value

  • Screen-grid voltage

    125 V

    Published datasheet value

  • Mutual conductance

    45 mA/V

    Published datasheet value

  • Mutual conductance

    50 mA/V

    Published datasheet value

  • Amplification factor

    30

    Published datasheet value

  • Internal resistance

    20 kQ

    Published datasheet value

  • Anode current

    50 mA

    Published datasheet value