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8068

Beam pentode developed specifically as a series regulator for high-voltage power supplies, combining a 3.5 kV plate rating with useful transconductance for stabilized supply control.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 8
Nominal heater: 6.3 V / 900 mA

Description

The 8068 is a beam pentode developed specifically as a series regulator in high-voltage power supplies, combining a 3.5 kV plate rating with useful transconductance.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 900 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

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 54500 Ω
Transconductance: 0.0052 S
Max plate voltage: 3500 V
Max screen voltage: 250 V
Max plate dissipation: 35 W
Max screen dissipation: 1 W
Max cathode current: 100 mA
Rectifier max heater-cathode voltage: 200 V

Promoted fields mapped by printed headings; additional data retained in parameters.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate Voltage
600 V
SeriesRegulator

Characteristic

Plate Resistance
54500 ohm
Typical
Transconductance
5200 uS
Typical

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Grid-to-plate capacitance
0.6 pF
WholeTube
Input capacitance
10 pF
WholeTube
Output capacitance
5.5 pF
WholeTube
Grid To Plate
0.6 pf
PublishedTable
Limits Of Applied Voltage - Ac Or Dc
0.6 VOLTS
PublishedTable
Plate Voltage
3500 VOLTS
PublishedTable
Grid 2 Voltage
2 VOLTS
PublishedTable
Plate Dissipation
35 WATTS
PublishedTable
Grid 2 Dissipation
1 WATTS
PublishedTable
Dc Cathode Current
100 MA
PublishedTable
Grid 1 Circuit Resistance
0.1 MEGOHMS
PublishedTable
Plate Voltage
600 VOLTS
PublishedTable
Grid 2 Voltage
125 VOLTS
PublishedTable
Grid 1 Voltage
-7.5 VOLTS
PublishedTable
Plate Current
36 MA
PublishedTable
Grid 2 Current
1 MA
PublishedTable

Other

Plate voltage
600 V
WholeTube
Grid 2 voltage
125 V
WholeTube
Grid 1 voltage
-7.5 V
WholeTube
Plate current
36 mA
WholeTube
Grid 2 current
1 mA
WholeTube
Maximum Heater-Cathode Voltage
200 VOLTS
PublishedTable

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater Voltage, AC or DC*. . . . .. 6.3=
0.6 V
Published datasheet line; semantic text-layer recovery
Heater Currentt
900 mA
Published datasheet line; semantic text-layer recovery
Grid to Plate: (g top)
0.6 pF
Published datasheet line; semantic text-layer recovery
Input:gto(h + k + g2 + b.p.)
10 pF
Published datasheet line; semantic text-layer recovery
Output: pto (h + k + g2 + b.p.)
5.5 pF
Published datasheet line; semantic text-layer recovery
Output: pto (h + k + g2 + b.p.)
42 in
Published datasheet line; semantic text-layer recovery
Minimum Seated Height
34 in
Published datasheet line; semantic text-layer recovery
Plate Voltage
3500 V
Published datasheet line; semantic text-layer recovery
Screen Voltage
250 V
Published datasheet line; semantic text-layer recovery
Screen Voltage
200 V
Published datasheet line; semantic text-layer recovery
Plate Dissipation
35 W
Published datasheet line; semantic text-layer recovery
Screen Dissipation
1 W
Published datasheet line; semantic text-layer recovery
Screen Dissipation
200 V
Published datasheet line; semantic text-layer recovery
3500
600 V
Published datasheet line; semantic text-layer recovery
3500
1 mA
Published datasheet line; semantic text-layer recovery
Screen Voltage. . .. ........ 100
125 V
Published datasheet line; semantic text-layer recovery
Grid-Number 1 Voltage . . . . . -30 —
7.5 V
Published datasheet line; semantic text-layer recovery
Plate Resistance, approximate
54500 Ohm
Published datasheet line; semantic text-layer recovery
Transconductance
5200 uS
Published datasheet line; semantic text-layer recovery
Transconductance
6.3 V
Published datasheet line; semantic text-layer recovery
Plate Current. . ... ... ........10
36 mA
Published datasheet line; semantic text-layer recovery
i Ecp =
125 V
Published datasheet line; semantic text-layer recovery
Eco =
250 V
Published datasheet line; semantic text-layer recovery
& 7 el ~
0 V
Published datasheet line; semantic text-layer recovery
Ep =
600 V
Published datasheet line; semantic text-layer recovery
E, =
600 V
Published datasheet line; semantic text-layer recovery
£; =
6.3 V
Published datasheet line; semantic text-layer recovery
R
35 W
Published datasheet line; semantic text-layer recovery

Characteristic

DC Cathode Current
100 mA
Published datasheet line; semantic text-layer recovery