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EE50

Single-ended secondary-emission valve designed for television-frequency amplification, exploiting secondary-electron multiplication to provide useful gain at wide video and television bandwidths.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 300 mA

Description

The Mullard EE50 is a single-ended secondary-emission valve intended for television-frequency amplification.

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
6.3 V
Nominal heater current
300 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

Other

X-ray radiationInterelectrode capacitances
Plate resistance
250000 Ω
Transconductance
0.014 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.2 W

Secondary-emission television amplifier section.

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

Other

Other

  • Maximum Plate Supply Voltage

    550 V

  • Maximum Plate Voltage

    250 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Screen Supply Voltage

    550 V

  • Maximum Screen Voltage

    250 V

  • Maximum Screen Dissipation

    0.2 W

  • Maximum Secondary-Emission Electrode Supply Voltage

    550 V

  • Maximum Secondary-Emission Electrode Voltage

    150 V

  • Maximum Secondary-Emission Electrode Dissipation

    1.5 W

  • Plate Voltage

    250 V

    TelevisionAmplifier

  • Screen Voltage

    250 V

    TelevisionAmplifier

  • Secondary-Emission Electrode Voltage

    -150 V

    TelevisionAmplifier

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Other

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    300 mA

  • Transconductance

    14000 uS

  • Plate resistance

    0.25 Mohm

  • Equivalent noise resistance

    3000 ohm

Construction

  • Tube construction

    Secondary-emission amplifier system

Other

  • Typical plate voltage

    250 V

  • Typical grid 2 voltage

    250 V

  • Secondary cathode voltage

    150 V

  • Grid 1 voltage

    -3 V

  • Plate current

    10 mA

  • Grid 2 current

    0.6 mA

  • Secondary cathode current

    -8 mA

Capacitance

  • Cold plate-grid capacitance maximum

    0.003 pF

  • Cold grid input capacitance

    7.7 pF

  • Cold plate capacitance

    7.7 pF

  • Hot grid input capacitance

    9.1 pF