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Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Triode Pentode ·Pentode-Triode

9X8

No short description is recorded for this tube.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
-
Base pins
-
Nominal heater
9.5 V / 300 mA

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
9.5 V
Nominal heater current
300 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Max plate voltage
250 V
Max screen voltage
250 V

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

1970 Sylvania Technical Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Plate Voltage

    125 V

  • Screen Voltage

    125 V

SECTION 2

Pentode

Characteristics

  • Plate Voltage

    125 V

  • Screen Voltage

    125 V