Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Cutoff characteristic
Variable-mu
Application
Application
RF / IF amplifier
Voltage Pentode or Tetrode (under 100V) ·Pentode
DF63
Mullard subminiature variable-mu RF pentode for battery-operated equipment. It combines compact construction, low-power filament operation, and controlled gain for portable receiver RF stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- WIRE8
- Base pins
- 8
- Nominal heater
- 1.25 V / 25 mA
Description
The Mullard DF63 is a subminiature variable-mu RF pentode for battery-operated equipment.
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
- 1600000 Ω
- Transconductance
- 0.00085 S
- Max plate voltage
- 90 V
- Max screen voltage
- 67.5 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
Characteristics
Filament Voltage
1.25 V
DCOnly
Filament Current
25 mA
DCOnly
Plate Voltage
67.5 V
Screen Voltage
67.5 V
Plate Current
1.7 mA
Screen Current
0.49 mA
Transconductance
850 uS
Plate Resistance
1600000 ohm
Grid Voltage for 100:1 Transconductance Reduction
-14 V
Input Capacitance
3 pF
Output Capacitance
3.5 pF
Plate-Grid Capacitance
0.01 pF
Maximum
Other
Maximum Plate Voltage
90 V
Maximum Screen Voltage
67.5 V
Maximum Cathode Current
2.5 mA