6225

Shock-resistant subminiature semi-remote-cutoff pentode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 8
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: 8
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 1

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0045 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max plate dissipation: 1.1 W
Max screen dissipation: 0.35 W
Max cathode current: 16.5 mA

Sonotone 6225 semi-remote-cutoff rugged subminiature RF pentode with coated unipotential cathode and eight flexible leads (lead 1 g1, 2/4/8 cathode-g3-shield, 3/6 heater, 5 plate, 7 screen g2). Heater 6.3 V 175 mA. Absolute maximum ratings: DC plate 165 V, screen 155 V, plate dissipation 1.1 W, grid-2 input 0.35 W, DC cathode current 16.5 mA. Typical at Va 100 V, cathode resistor 120 ohms: plate 7.2 mA, screen 2.0 mA, transconductance 4500 µmhos (0.0045 S). Plate resistance 175 kΩ specified as MINIMUM rather than nominal; promoted rp remains NULL. Shielded grid-plate capacitance 0.015 pF, output 3.4 pF. Rugged shock and vibration test specifications, manufacturer impact max 600g, operation time ~20 s; no nonexplicit input capacitance promoted.

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 1

Pentode

Other

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