T116

Directly heated electrometer tetrode using a space-charge grid for extremely low-current measurement, with very low grid current and careful insulation requirements for precision instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.25 V / 50 mA

Description

The T116 is a directly heated electrometer tube using a space-charge grid. Its normal operating point is around 10 V plate and space-charge-grid voltage, with very small grid current and explicit precautions for insulation, vibration and ionization effects.

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: 1.25 V
Nominal heater current: 50 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.000138 S
Max plate voltage: 12 V

Electrometer/space-charge-grid tube; maximum space-charge-grid voltage also 12 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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Plate voltage
10 V
NormalOperatingPoint
Space-charge-grid voltage
10 V
NormalOperatingPoint
Control-grid bias
-3 V
NormalOperatingPoint
Plate current
0.24 mA
NormalOperatingPoint
Maximum space-charge-grid voltage
12 V

Characteristics

Penetration factor
55 %
NormalOperatingPoint
Grid current
<6e-8 A
NormalOperatingPoint