7550

Reliable subminiature double triode for critical amplifier and control service, with a 400 V plate rating and robust cathode-current capability in a compact construction.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 500 mA

Description

Reliable subminiature double triode for critical amplifier and control service.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 500 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max plate dissipation: 1.5 W
Max grid dissipation: 0.4 W
Max cathode current: 30 mA

Primary physical section. Raytheon CK7550: 250 V maximum average DC plate voltage; 400 V instantaneous forward pulse voltage is a transient spike rating only (leading edge, limited duration). Grid dissipation maximum 0.4 W per grid; pulse cathode current specifications are test-condition dependent.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max plate dissipation: 1.5 W
Max grid dissipation: 0.4 W
Max cathode current: 30 mA

Second physical section. Raytheon CK7550: 250 V maximum average DC plate voltage; 400 V instantaneous forward pulse voltage is a transient spike rating only (leading edge, limited duration). Grid dissipation maximum 0.4 W per grid; pulse cathode current specifications are test-condition dependent.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
500 mA
Nominal
Maximum Plate Voltage
400 V
Maximum Plate Dissipation
1.5 W
Maximum Cathode Current
30 mA