Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Tetrode (NOT beam) ·Tetrode

4305A

Standard Valves directly heated tetrode with published operating data. Its power-capable construction is intended for output-stage service rather than ordinary voltage amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
4
Nominal heater
10 V / 3.1 A

Description

The 4305A is a tetrode described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.

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
10 V
Nominal heater current
3.1 A
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

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
40000 Ω
Transconductance
0.004 S
Max plate voltage
1000 V
Max screen voltage
200 V
Max plate dissipation
60 W
Max screen dissipation
6 W
Max cathode current
125 mA

Ratings and characteristics extracted from 4305A.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

Tetrode

Characteristics

  • Total emission

    1 A

    Published datasheet value

  • Grid-anode capacitance

    0.14 pF

    Published datasheet value

  • Input capacitance

    105 pF

    Published datasheet value

  • Output capacitance

    5.4 pF

    Published datasheet value

Other

  • Maximum frequency for above ratings

    50 MHz

    Published datasheet value

  • Maximum direct grid current

    40 mA

    Published datasheet value

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

  • Filament voltage

    10 volts

  • Nominal filament curren

    3.1 amps

  • Impedance

    40000 ohms

  • Mutual conductance

    0.004 A/V

Other

  • at Vp ==

    1000 volts

  • Maximum direct anode voltage

    1000 volts

  • Maximum direct anode curren

    0.125 amps

  • Maximum anode dissipation

    60 watts

  • Maximum screen-grid voltage

    200 volts

  • Maximum screen-grid dissipation

    6 watts

  • Maximum direct grid curren

    0.04 amps

  • Maximum anode voltage for frequency o

    100 Mc

  • Direct anode voltage 1,000 750 800 { 500 1,000

    750 volts

  • —270 |

    -200 volts

  • Direct screen-grid voltage; 200 150 200 200 200

    200 volts

  • Direct anode current 90 120 125 125 125

    125 mA

  • Anode dissipation 60 60 30 [ 30 40

    29 watts

  • Carrier output 30 30 70 i 42 85

    65 watts

  • These curves are taken at :—Vg =

    10 volts

  • These curves are taken at :—Vg

    10 volts

  • These curves are taken at :—Vf =

    10 volts