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Voltage Pentode - Remote Cutoff (single) ·Pentode

UF21

Variable-mu pentode for RF, IF, and audio amplifier service in 100 mA series-heater equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B8G
Base pins
8
Nominal heater
12.6 V / 100 mA

Description

Variable-mu series-heater pentode for RF, IF, or audio amplifier service.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B8G
Base pins
8
Nominal heater voltage
12.6 V
Nominal heater current
100 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
Plate resistance
1000000 Ω
Transconductance
0.0023 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2 W

Published ratings and characteristics promoted semantically from the approved source; identical repeated sections compressed where applicable.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    170 V

  • Plate Current

    6 mA

  • Screen Voltage

    120 V

  • Screen Current

    1.75 mA

Characteristic

  • Transconductance

    2300 µS

  • Plate Resistance

    1000000 ohm

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Capacities Cagl < 0,002 pF

    0.002 a

    Capacities Cagl < 0,002 pF

  • Capacitznces Cagt < 0,002 pF

    0.002 a

    Capacitznces Cagt < 0,002 pF

  • fication on grid 1

    1 a

    fication on grid 1

  • de l'amplification sur la grille 1

    1 a

    de l'amplification sur la grille 1