7079

Fast-warm-up subminiature medium-mu double triode designed for UHF and high-peak-current pulse service, with long-life construction and reliable operation under severe shock and vibration.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: SUBMINIATURE8
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

Fast-warm-up medium-mu subminiature double triode designed for UHF operation, high peak-current pulse emission, long life, and reliable service under severe environmental conditions.

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: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

Transconductance: 0.005 S
Amplification factor: 20
Max plate voltage: 165 V
Max plate dissipation: 0.95 W

Published electrical section from 7079.pdf; identical repeated sections compressed when applicable.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.005 S
Amplification factor: 20
Max plate voltage: 165 V
Max plate dissipation: 0.95 W

Second physical triode section; electrically identical twin section.

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

Plate Voltage Eb: e 100 100
165 V
Plate Voltage Eb: e 100 100 165 Vde
Grid #1 Circuit Resistance Rg/g: —eae PR 1.0
1.1 Meg
Grid #1 Circuit Resistance Rg/g: —eae PR 1.0 1.1 Meg.
Heater -Cathode Voltage Ehk: =200 cae- 100
200 V
Heater -Cathode Voltage Ehk: =200 cae- 100 +200 Vdc
be vibrated in each of the three planes for 30 minutes at a fixed frequency between 50 and
60 Hz
The tube shall then be vibrated in each of the three planes for 30 minutes at a fixed frequency between 50 and 60cps
for Vibration (1) and 450 and
500 Hz
for Vibration (1) and 450 and 500cps for Vibration (2). The same tubes shall be used for both vibration tests.