Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
Class-C RF amplifier / oscillator / frequency multiplier
ClassC
Voltage Pentode ·Pentode
DL98
Battery RF output pentode designed for Class-C amplifier and oscillator service. Its directly heated construction provides radio-frequency power generation from portable battery supplies.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater
- 1.25 V / 330 mA
Description
Battery RF output pentode for Class C amplifier and oscillator service.
Socket description
Subminiature all-glass 8-wire lead family
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater voltage
- 1.25 V
- Nominal heater current
- 330 mA
- Parallel heater voltage
- 1.25 V
- Parallel heater current
- 330 mA
- Series capable
- Yes
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
- 22000 Ω
- Transconductance
- 0.00215 S
- Max plate voltage
- 150 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 3 W
- Max screen dissipation
- 1.1 W
- Max cathode current
- 32 mA
Published Mullard/Philips ratings and characteristics promoted where applicable; additional values retained as 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 02
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
100 mA
Plate Voltage
120 V
Screen Voltage
120 V
Plate Current
30 mA
Screen Current
1.8 mA
Transconductance
2.15 mA/V
Plate Resistance
22 kohm
Control Grid Voltage
-10 V
MaximumOperatingFrequency
100 MHz
Other
Plate Voltage
150 V
ClassC;Frequency=100MHz
Screen Voltage
135 V
ClassC
Power Output
1.25 W
ClassC