Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
Battery audio output
Power - Pentode (NOT beam) ·Pentode
DL69
Subminiature 90 V battery output pentode. Designed for compact portable audio equipment, it provides low-frequency output power from conventional battery-receiver supply voltages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater
- 1.25 V / 25 mA
Description
Subminiature 90 V battery output pentode.
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
- 25 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
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 800000 Ω
- Transconductance
- 0.00085 S
- Max plate voltage
- 90 V
- Max screen voltage
- 90 V
- Max cathode current
- 2.5 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
1.25 V
HeaterOrFilamentCurrent
25 mA
Plate To Grid Capacitance
0.05 pF
Input Capacitance
2.9 pF
Output Capacitance
3.2 pF
Plate Voltage
90 V
Screen Voltage
90 V
Plate Current
1.75 mA
Screen Current
0.4 mA
Control Grid Voltage
-2.5 V
Other
Power Output
50 mW
ClassA
Power Output
100 mW
PushPull;ClassAB