5BS8

High-frequency low-noise twin triode specifically intended for cascode VHF amplifier service, particularly the sensitive RF front end of television and similar receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 5.6 V / 450 mA

Description

High-frequency low-noise twin triode for cascode VHF amplifier service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 5.6 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.01 S
Max plate voltage: 150 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

Two similar triode sections; represented once under identical-section compression.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.01 S
Max plate voltage: 150 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

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

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage maximum
150 V
Cathode current maximum
20 mA
Plate dissipation maximum
2 W

Capacitance

Grid-to-plate capacitance per section
1.15 pF
Plate-to-cathode capacitance per section
0.15 pF
Inter-section plate-to-plate capacitance
0.01 pF

Characteristics

Class-A plate resistance
5000 ohm
ClassA
Class-A transconductance
10000 uS
ClassA
Cascode transconductance
7200 uS
Cascode

Application

Application
Low-noise VHF cascode amplifier