5639WA

Ruggedized subminiature video power pentode for wideband RF/video amplification from low plate supplies in demanding equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 450 mA

Description

Ruggedized subminiature heater-cathode video power pentode for wideband RF/video service at low plate supply voltage.

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: 450 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

Plate resistance: 50000 Ω
Transconductance: 0.009 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max plate dissipation: 3.5 W
Max screen dissipation: 1 W
Max cathode current: 40 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when applicable.

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

Pentode

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
450 mA
Published nominal value
Transconductance
9000 µS
Published characteristic

Other

Maximum plate dissipation
3.5 W
Published maximum rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Nominal
Heater current
300 mA
Nominal

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
150 V
Typical
Grid #2 voltage
100 V
Typical
Cathode resistor
100 ohm
Typical
Plate current
21 mA
Typical
Grid #2 current
4 mA
Typical
Maximum heater-cathode voltage
200 V
Peak plate voltage
360 V
VideoPowerAmplifier

Characteristic

Transconductance
9000 uS
Typical
Plate resistance
50000 ohm
Typical
Grid #1 voltage at 10 uA plate current
-14 V

Capacitance

Input capacitance
9 pF
Output capacitance
8 pF