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Voltage - Triode (single) ·Triode

26

General-purpose receiving triode for voltage amplification, detection, oscillator, or Class-A service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
4D
Socket code
UX4
Base pins
4
Nominal heater
1.5 V / 1.05 A

Description

Directly heated triode amplifier.

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
4D
Socket code
UX4
Base pins
4
Nominal heater voltage
1.5 V
Nominal heater current
1.05 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

4D - 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7300 Ω
Transconductance
0.00115 S
Amplification factor
8.3
Max plate voltage
180 V

Promoted representative characteristics at 180 V plate.

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

1932 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid-plate capacitance

    8.1 pF

    Published direct interelectrode capacitance

  • Grid-filament capacitance

    3.5 pF

    Published direct interelectrode capacitance

Data set 02

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    180 V

    Published datasheet rating

  • Plate voltage

    180 V

    ClassA

  • Control-grid bias

    14.5 V

    ClassA

  • Plate current

    6.2 mA

    ClassA

Characteristic

  • Plate resistance

    7300 ohm

    Published datasheet characteristic

  • Transconductance

    1180 µS

    Published datasheet characteristic

  • Amplification factor

    8.3

    Published datasheet characteristic

  • Heater/filament voltage

    1.5 V

    Published heater/filament rating

  • Heater/filament current

    1.05 A

    Published heater/filament rating

Capacitance

  • Input capacitance

    3.45 pF

    Published capacitance

  • Output capacitance

    2.2 pF

    Published capacitance

  • Grid-to-plate capacitance

    8.1 pF

    Published capacitance

Data set 03

193X Cunningham

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater/filament voltage

    1.5 V

    Published nominal

  • Heater/filament current

    1.05 A

    Published nominal

  • Transconductance

    950 uS

    Published characteristic

  • Amplification factor

    8.3

    Published characteristic

  • Plate resistance

    8700 Ohm

    Published characteristic

Data set 04

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • The

    26

    The 26 is an amplifier tube con- —/\—

  • PiLAMENT VOLTAGE (A. C.or D.C)

    1.5 V

    PiLAMENT VOLTAGE (A. C.or D.C).............. 1.5 Volts

  • PILAMENT CURRENT ....oovinivnnnnnnnennnnnnas

    1.05 A

    PILAMENT CURRENT ....oovinivnnnnnnnennnnnnas 1.05 Amperes

  • PLATE VOLTAGE

    180 V

    PLATE VOLTAGE .................. 90 135 180 max. Volts

  • GRID VOLTAGE* .................. =

    -14 V

    GRID VOLTAGE* .................. =7 -10 -14% Volts

  • PLATE CURRENT ......ovvvvnnennn

    6.2

    PLATE CURRENT ......ovvvvnnennn. 2.9 5.5 6.2 Milliamperes

  • AMPLIFICATION FACTOR

    8.3

    AMPLIFICATION FACTOR ........... 8.3 8.3 8.3

  • The coated filament of the

    1.5

    The coated filament of the 26 should be operated at the rated voltage of 1.5

  • ISTIég an amplifier, the

    26

    ISTIég an amplifier, the 26 should be operated as shown under CHARACTER.

  • Ef=

    1.5 V

    Ef=1.5 VOLTS D.C.

  • [ Ly L mnnz voLTS

    505 V

    [ Ly L mnnz voLTS 92C-505R2

Characteristic

  • PLATE RESISTANCE

    7300 ohm

    PLATE RESISTANCE ............... 8900 7600 7300 Ohms

  • TRANSCONDUCTANCE

    1150 µS

    TRANSCONDUCTANCE .............. 935 1100 1150 Micromhos

Data set 05

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Filament current

    1.05 A

Data set 06

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum plate voltage

    180 V

    Published handbook rating

  • Plate voltage

    180 V

    ClassA

  • Control-grid bias

    14.5 V

    ClassA

  • Plate current

    6.2 mA

    ClassA

Characteristic

  • Plate resistance

    7300 ohm

    Published handbook characteristic

  • Transconductance

    1150 µS

    Published handbook characteristic

  • Amplification factor

    8.3

    Published handbook characteristic

  • Heater/filament voltage

    1.5 V

    Published heater/filament rating

  • Heater/filament current

    1.05 A

    Published heater/filament rating

Capacitance

  • Input capacitance

    2.8 pF

    Published capacitance column

  • Output capacitance

    2.5 pF

    Published capacitance column

  • Grid-to-plate capacitance

    8.1 pF

    Published capacitance column

Data set 07

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid To Plate Capacitance

    8.1 pF

    DirectInterelectrode

  • Input Capacitance

    3.1 pF

    DirectInterelectrode

  • Output Capacitance

    2.2 pF

    DirectInterelectrode