21A6

PL81/21A6 beam-power pentode designed for television horizontal line-output and deflection service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9AS
Socket code: B9A
Base pins: 9
Nominal heater: 21 V / 300 mA

Description

Explicit 21A6 co-designation on the PL81/21A6 television line-output pentode sheet.

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: 9AS
Socket code: B9A
Base pins: 9
Nominal heater voltage: 21 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AS - 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: 0.0065 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 8 W
Max screen dissipation: 4.5 W
Max cathode current: 150 mA

Beam-power amplifier intended for television horizontal-deflection service.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Peak Positive Plate Pulse Voltage
7000 V
LineFlyback

Characteristic

Application
Television line time-base output

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
180 V
HorizontalDeflection; OperatingPoint1
Screen voltage
180 V
HorizontalDeflection; OperatingPoint1
Control-grid bias
23 V
HorizontalDeflection; OperatingPoint1
Plate current
45 mA
HorizontalDeflection; OperatingPoint1
Screen current
3 mA
HorizontalDeflection; OperatingPoint1
Plate voltage
180 V
HorizontalDeflection; OperatingPoint2
Screen voltage
180 V
HorizontalDeflection; OperatingPoint2
Control-grid bias
0 V
HorizontalDeflection; OperatingPoint2
Plate current
430 mA
HorizontalDeflection; OperatingPoint2
Screen current
29 mA
HorizontalDeflection; OperatingPoint2
Maximum positive pulse plate voltage
7000 V
HorizontalDeflection; PulseRated
Maximum plate dissipation
8 W
HorizontalDeflection
Maximum screen dissipation
4.5 W
HorizontalDeflection
Maximum DC cathode current
150 mA
HorizontalDeflection
Maximum plate voltage
250 V
Maximum screen voltage
250 V

Characteristics

Transconductance
6500 uS
HorizontalDeflection; OperatingPoint1

Data set 03

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
21 V
HeaterOrFilamentCurrent
300 mA

Other

PeakAnodeVoltage
7000 V
FrameTimeBase