8057

Dual-filament Bayard-Alpert ionization-gauge triode for measuring very low pressures in high-vacuum systems.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7 V / 2.5 A

Description

Dual-filament Bayard-Alpert style ionization-gauge triode for high-vacuum pressure measurement.

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: 7 V
Nominal heater current: 2.5 A
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

Gauge

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Westinghouse 8057 Bayard-Alpert ionization vacuum gauge, using two tungsten filaments selectable singly, in series or parallel. Grid maximum +500 V relative to filament; ion collector maximum negative voltage -100 V. These are ionization-gauge electrode limits, not a conventional triode plate-voltage rating.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Gauge

Other

HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
2.5 A
Nominal
MaximumPlateOrOperatingVoltage
500 V
TypicalGridVoltage
150 V
Ionization gauge service

Characteristic

FilamentOperatingModes
-
Single, series, or parallel