Data set 01
1963 Siemens
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Heater voltage
20 V
Heater current
125 mA
Characteristics
Transconductance
6500 µS
Nominal/Bogey
Amplification factor
19
Nominal/Bogey
Voltage Pentode ·Pentode
C3M
Professional universal long-life pentode for series or parallel heater operation, with approximately 10,000-hour guaranteed service life.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- Loctal
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 20 V / 125 mA
Description
Professional universal long-life pentode for series or parallel heater operation, with guaranteed 10,000-hour life.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- Loctal
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 20 V
- Nominal heater current
- 125 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Loctal - 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
- 250000 Ω
- Transconductance
- 0.0065 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 4 W
- Max screen dissipation
- 1 W
- Max grid dissipation
- 0.05 W
- Max cathode current
- 30 mA
Published ratings and characteristics promoted where semantically applicable; additional published values retained as section 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
1999 Philips 0-D
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Anode supply voltage
225 V
Published datasheet value
Grid No.2 supply voltage
155 V
Published datasheet value
Cathode resistor
250 Ω
Published datasheet value
Output power
1.5 W
ClassA; Ra=10kΩ; d=10%
Maximum cathode-heater voltage
- to 120 V
Published datasheet value
Maximum bulb temperature
- to 120 °C
Published datasheet value
Grid No.3 maximum voltage
- to 300 V
Published datasheet value
Grid No.3 maximum dissipation
- to 1 W
Published datasheet value
Triode-connected combined dissipation
- to 5 W
TriodeConnection
Characteristics
Anode current
13.5 to 19 mA
Published datasheet value
Grid No.2 current
2 to 4 mA
Published datasheet value
Mutual conductance
5.5 to 7.8 mA/V
Published datasheet value
Internal resistance
200 to - kΩ
Published datasheet value
Amplification factor
19
Published datasheet value
Equivalent noise resistance RF
- to 2000 Ω
Published datasheet value
Equivalent noise resistance RF triode-connected
650 Ω
TriodeConnection
Equivalent noise resistance AF
5000 Ω
500-3000 Hz
Cathode heating time
19 to 33 s
Published datasheet value
Input capacitance
7.5 to 9.5 pF
Published datasheet value
Output capacitance
4.5 to 7.7 pF
Published datasheet value
Anode-grid No.1 capacitance
- to 0.018 pF
Published datasheet value
Grid-heater capacitance
- to 0.04 pF
Published datasheet value
Anode-heater capacitance
0.12 pF
Published datasheet value
Life test duration
10000 h
Published datasheet value