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6221

Sonotone 6221 rugged subminiature medium-mu triode for extreme shock and vibration environments, with 6.3 V 175 mA heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 175 mA

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: 6.3 V
Nominal heater current: 175 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 0

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0058 S
Amplification factor: 27
Max plate voltage: 165 V
Max plate dissipation: 3.3 W

Sonotone 6221 JETEC 1955 rugged medium-mu triode. Heater 6.3 V 175 mA. Absolute max plate 165 V, dissipation 3.3 W, plate current 22 mA, grid current 5.5 mA, negative grid 55 V magnitude, heater-cathode 200 V. Typical Va 100 V, Rk 150 Ω, Ia 8.5 mA, mu 27, gm 0.0058 A/V, grid cutoff -7 V for Ia 10 µA. Cgp 1.8 pF, input 2.2 pF unshielded. Shock 600 g, max bulb 220°C, life 1000 h, 2500 heater cycles, noise limits 25/50/100 mV p-p under vibration tests.

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

9999 Mixed G 2000

Published operating points and test conditions from this source.

SECTION 0

Triode

Other

Maximum plate voltage
165 V
Maximum plate voltage
Heater/filament voltage
6.3 V
Heater voltage
Heater/filament current
175 mA
Heater current