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DBS1

Directly heated low-voltage screen tetrode for economical receiving equipment. Available source material confirms screened-tetrode operation without a narrower specialized function.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.5 V / 70 mA

Description

The Mullard DBS1 is a directly heated screen-grid tetrode intended for low-voltage battery-operated circuits.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 1.5 V
Nominal heater current: 70 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

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 650000 Ω
Transconductance: 0.00058 S
Max plate voltage: 150 V
Max screen voltage: 80 V

Screen-grid tetrode 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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Filament Voltage
1.5 V
Filament Current
70 mA
Plate Voltage
120 V
OperatingPoint1
Screen Voltage
45 V
OperatingPoint1
Plate Current
0.8 mA
OperatingPoint1
Transconductance
430 uS
OperatingPoint1
Plate Resistance
650000 ohm
OperatingPoint1
Plate Voltage
120 V
OperatingPoint2
Screen Voltage
60 V
OperatingPoint2
Plate Current
1.5 mA
OperatingPoint2
Transconductance
580 uS
OperatingPoint2
Plate Resistance
500000 ohm
OperatingPoint2
Plate-Grid Capacitance
0.07 pF
Input Capacitance
5.7 pF
Output Capacitance
3.4 pF

Other

Maximum Plate Voltage
150 V
Maximum Screen Voltage
80 V
Maximum Grid Leak Resistance
1 Mohm