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Specialized - Microwave Tube ·Triode

8108

Long-life disc-seal microwave triode for amplifier, oscillator, frequency-doubler, and tripler service into the multi-gigahertz region.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 735 mA

Description

Long-life disc-seal microwave triode for amplifier, oscillator, frequency-doubler and tripler applications into the multi-gigahertz region.

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
735 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

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.021 S
Amplification factor
43
Max plate voltage
300 V
Max plate dissipation
12.5 W
Max grid dissipation
0.2 W
Max cathode current
70 mA

Published ratings/characteristics promoted from the source; representative section used for repeated identical systems 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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Transconductance

    21000 µS

  • Amplification Factor

    43

Other

  • Maximum Plate Voltage

    300 V

  • Maximum Plate Dissipation

    12.5 W

  • Maximum Grid Dissipation

    0.2 W

  • Maximum Cathode Current

    70 mA

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    180 V

  • Plate current

    60 mA

  • Power output

    0.5 W

    Gain 19 dB; bandwidth 25-3.0 dB; 3000 MHz

  • Power output

    0.25 W

    Doubler; 6000 MHz

  • Power output

    0.5 W

    Gain 13 dB; bandwidth 50-0.1 dB; 4000 MHz

  • Maximum useful frequency

    6000 MHz

Characteristic

  • Transconductance

    21000 uS

Capacitance

  • Grid-to-plate capacitance

    1.4 pF

  • Input capacitance

    3 pF

  • Plate-to-filament capacitance

    0.035 pF