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Voltage Pentode - High Frequency (single) ·Pentode

4328A

Professional carrier-frequency pentode for telecommunications amplification, featuring top-cap control grid and detailed high-frequency capacitance specifications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX6
Base pins
6
Nominal heater
7.5 V / 425 mA

Description

Pentode.

Socket description

Small 6-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
UX6
Base pins
6
Nominal heater voltage
7.5 V
Nominal heater current
425 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
Transconductance
0.002 S
Max plate voltage
250 V
Max screen voltage
180 V
Max cathode current
7.5 mA

Ratings and characteristics extracted from 4328A.pdf.

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 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Control-grid to anode capacitance

    0.025 pF

  • Suppressor-grid to anode capacitance

    1.25 pF

  • Anode to heater/cathode/screen capacitance

    2.2 pF

  • Control-grid to suppressor-grid capacitance

    1.8 pF

  • Control-grid to heater/cathode/screen capacitance

    4 pF

  • Suppressor-grid to heater/cathode/screen capacitance

    7.5 pF

Other

  • Maximum screen current

    2.5 mA

  • Maximum heater-cathode voltage

    150 V

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Nominal heater voltage

    7.5 volts

  • Heater curren

    0.425 amps

  • Mutual conductance

    -9 mA

  • ;‘Ict:zl::ll c?ilziductance Va250V Vg,

    180 V

Other

  • Curren

    425 mA

  • Nominal voltage

    7.5 v

  • Control grid to anode

    0.025 uuF

  • Grid to Anode

    0.03 pF

  • Vp =

    250 v

  • OQutpu

    14 pF

  • Vg1 =

    -55 v

  • Maximum direct anode voltage

    250 v

  • Maximum direct anode voltage

    250 volts

  • Maximum direct anode curren

    75 mA

  • Maximum direct screen voltage

    180 volts

  • Maximum direct screen voltage

    180 v

  • Maximum cathode curren

    10 mA

  • Maximum direct screen cyrren

    2.5 mA

  • Maximum screen curren

    2.5 mA

  • June 1946

    5 A

  • 135 135 135 135 135 135 180 180 225 225 250 250 250

    250 volts

  • (4328D)

    4328 A

  • 135 135 135 135 135 135 135 135 135 135 135 135 135

    135 volts

  • BASING

    4328 A

  • —3 —3 —3 —3 —3 —3 —3 —3 —3 —3 —3 —3

    -3 volts

  • June 1946

    5 A

  • 0 0 0 0 0 0 0 0 0

    0 volts

  • 54 5.4 54 54 54 54 5.4 55 5-5 5-5 55 5-5

    55 mA

  • Iz HEATER VOLTAGE

    7.5 VOLTS

  • xE V=

    75 VOLTS

  • LJ Vp=135 VOLTS |

    10000 OHMS

  • 2« Vee:135 VOLTS 2

    20000 OHMS

  • Q 2400} vg5

    0 voLTS

  • Vi =

    7.5 VOLTS

  • Ve = I35 VOLTS I

    10000 OHMS

  • Vg, =135 VOLTS 2

    20000 OHMS

  • Vg,

    -3 VOLTS

  • Vgs= O VOLTS 4

    60000 OHMS

  • < 5

    80000 OHMS

  • oI | Vve-135 vours |

    10000 OHMS

  • P Vg,=135 VOLTS 2

    20 OHMS

  • zZz \69

    -3 VOLTS

  • Z < 6

    100 OHMS

  • D Ve

    2 A