8444

Subminiature strap-frame-grid sharp-cutoff pentode for VHF RF/IF amplification and mixer service. High transconductance and severe-environment construction suit demanding military and professional high-frequency equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 125 mA

Description

Subminiature strap-frame-grid sharp-cutoff pentode for VHF RF/IF amplifier and mixer service under severe shock, vibration, temperature, altitude, and radiation environments.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 125 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: 260000 Ω
Transconductance: 0.009 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max plate dissipation: 1.1 W
Max screen dissipation: 0.55 W
Max cathode current: 16.5 mA

Published maximum ratings and characteristics promoted semantically from the approved source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Resistance
260000 ohm
Transconductance
9000 µS

Other

Maximum Plate Voltage
165 V
Maximum Screen Voltage
155 V
Maximum Plate Dissipation
1.1 W
Maximum Screen Dissipation
0.55 W
Maximum Cathode Current
16.5 mA
Plate Voltage
100 V
Screen Voltage
100 V
Plate Current
8.5 mA