Tube-number record

HOT FILAMENT IONIZATION GAUGE

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BrandSylvania

ClassSpecial Purpose Electronic Tubes

BaseFlexible / flying leads

Construction

Primary Type

Other / special

EnvelopePyrex Glass

Base MaterialGlass-to-metal seal / ground joint options

SectionsTriode (Filament, Grid, Collector)

Filament / Heater

MaterialHot filament

Absolute Maximum Ratings

Plate Voltage-25 V

Grid 2 Voltage150 V

Audio Performance

Key Features

Highly sensitive
Broad range
Linear scalers
Easily degassed sensing tubes
Hard-glass envelope
Crack-resistant glass-to-metal seal

Typical Operation

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Ionization Gauge Operation	-25 V	—	—	—	—

Application Notes

The hot filament ionization gauge measures vacuum pressures below 1x10-3 mm mercury. Electrons accelerated toward the grid collide with gas molecules to produce ions collected on the negative collector. Sensitivity is linear and directly proportional to grid current.

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