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8228

Subminiature cold-cathode precision reference tube maintaining approximately 81 V for regulated supplies, DC amplifiers, oscilloscope calibrators, and instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: T2
Socket code: -
Base pins: 2
Nominal heater: -

Description

Subminiature cold-cathode voltage-reference tube for stable regulated power supplies, DC amplifiers, oscilloscope calibrators, and similar applications, with very low temperature coefficient and long expected life.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: T2
Socket code: -
Base pins: 2
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

T2 - 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

Voltage Regulator

X-ray radiationInterelectrode capacitances

Max cathode current: 4 mA
Regulator voltage: 81 V
Regulator minimum current: 2 mA
Regulator maximum current: 4 mA
Regulator starting voltage: 115 V
Regulator maintaining voltage: 81 V
Regulator dynamic impedance: 200 Ω

Cold-cathode voltage-reference section; published reference values promoted from 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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

Starting voltage minimum
115 V
Operating cathode current minimum
0.5 mA
Operating cathode current maximum
3.5 mA
Operating voltage typical
82 V
At 2 mA
AC resistance maximum
500 ohm
At 2 mA, 1000 cps