Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Anode Voltage
90 V
Screen Voltage
90 V
Anode Current
2.7 mA
Screen Current
0.5 mA
Voltage Pentode or Tetrode (under 100V) ·Diode-Pentode
DAF91
Directly heated battery diode-pentode, equivalent to 1S5, combining signal detection with audio preamplification. Its low-consumption 1.4 V, 50 mA filament and high-resistance pentode suit portable radio receivers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- B7G
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 1.4 V / 50 mA
Description
Equivalent designation printed on the 1S5 source for the directly heated detector and audio-preamplifier diode-pentode.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- B7G
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 50 mA
- Parallel heater voltage
- 1.4 V
- Parallel heater current
- 50 mA
- Series capable
- Yes
B7G - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 500000 Ω
- Transconductance
- 0.00072 S
- Amplification factor
- 13.5
- Max plate voltage
- 90 V
- Max screen voltage
- 90 V
- Max plate dissipation
- 0.25 W
- Max screen dissipation
- 0.06 W
- Max cathode current
- 4.5 mA
Promoted from clearly identified published ratings/characteristics; additional operating points, capacitances, rectifier conditions, and application-specific values are retained in TUBE_SECTION_PARAMETER.
Section 2
Diode
X-ray radiationInterelectrode capacitances
- Max cathode current
- 0.2 mA
- Rectifier peak inverse voltage
- 100 V
- Rectifier nominal output current
- 200 mA
- Rectifier peak forward current
- 1.2 A
Promoted from clearly identified published ratings/characteristics; additional operating points, capacitances, rectifier conditions, and application-specific values are retained in TUBE_SECTION_PARAMETER.
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
1961 Ferranti Technical Handbook
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
AF amplifier
SECTION 2
Diode
Application
Application
Detector diode
Data set 03
1963 Philips Electron Tubes Handbook V1
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Plate capacitance
2.8 pF
Section1
Grid capacitance
2 pF
Section1
Grid-to-plate capacitance maximum
0.4 pF
Section1
Diode capacitance
1.5 pF
Section1
Other
Plate voltage
45 V
AudioAmplifier
Screen voltage
45 V
AudioAmplifier
Plate current
0.75 mA
AudioAmplifier
Screen current
0.15 mA
AudioAmplifier
Plate voltage
90 V
AudioAmplifier
Plate current
2.7 mA
AudioAmplifier
Screen current
0.6 mA
AudioAmplifier
Characteristic
Transconductance
420 µS
45VPlate
Transconductance
720 µS
90VPlate
Plate resistance
0.5 MΩ
90VPlate
SECTION 2
Diode
Other
Peak inverse voltage maximum
100 V
DetectorDiode
Average diode current maximum
0.2 mA
DetectorDiode
Peak diode current maximum
1.2 mA
DetectorDiode
Data set 04
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Plate-to-Grid Capacitance
<0.4 pF
PublishedCapacitance
Input Capacitance
2 pF
PublishedCapacitance
Output Capacitance
2.8 pF
PublishedCapacitance
Diode-to-Pentode Capacitance
1.5 pF
PublishedCapacitance
Characteristic
Plate Voltage
90 V
PentodeSection;90VPoint
Screen Voltage
90 V
PentodeSection;90VPoint
Plate Current
2.7 mA
PentodeSection;90VPoint
Screen Current
0.63 mA
PentodeSection;90VPoint
Transconductance
720 uS
PentodeSection;90VPoint
Plate Resistance
500 kohm
PentodeSection;90VPoint
Screen-to-Control-Grid Mu
13.5
PentodeSection;90VPoint
Other
Plate Voltage
90 V
PentodeSection
Plate Dissipation
0.25 W
PentodeSection
Screen Voltage
90 V
PentodeSection
Screen Dissipation
0.06 W
PentodeSection
Cathode Current
4.5 mA
PentodeSection
SECTION 2
Diode
Other
Peak Inverse Voltage
100 V
DiodeSection
Average Diode Current
0.2 mA
DiodeSection
Peak Diode Current
1.2 mA
DiodeSection
Data set 05
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater or filament voltage
1.4 V
Published nominal value
Heater or filament current
50 mA
Published nominal value
Transconductance
625 µS
Published operating characteristic
SECTION 2
Diode
Characteristics
Heater or filament voltage
1.4 V
Published nominal value
Heater or filament current
50 mA
Published nominal value
Transconductance
625 µS
Pentode section
Data set 06
1999 Philips 0-D
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Voltage amplification
75
Va=90V
Triode-connected voltage amplification
11
TriodeConnection