Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Heptode
Characteristic
Conversion Conductance
100 uS
Plate/screen 30 V
Oscillator Mutual Conductance
700 uS
Oscillator Amplification Factor
3.5
Voltage Pentode or Tetrode (under 100V) ·Heptode
1C8
Battery or receiving-tube frequency converter combining local-oscillator and mixer action for superheterodyne radio service. Its multi-grid structure provides frequency conversion while minimizing component count and, in battery types, filament power.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 8CN
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 1.25 V / 40 mA
Description
Directly heated pentagrid converter for low-voltage frequency-conversion service.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8CN
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 1.25 V
- Nominal heater current
- 40 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8CN - 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
Heptode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 400000 Ω
- Max plate voltage
- 67.5 V
- Max screen voltage
- 45 V
Promoted from the printed condensed-manual maximum/characteristic columns; operating-point 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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Heptode
Other
Oscillator grid current
0.07 mA
Converter
Grid resistor
100000 Ω
Converter
Plate voltage
67.5 V
Converter
Screen voltage
67.5 V
Converter
Control-grid voltage
0 V
Converter
Plate current
1 mA
Converter
Screen current
1.5 mA
Converter
Oscillator-grid resistor
20000 Ω
Converter
Characteristic
Plate resistance
400000 Ω
Converter
Conversion transconductance
150 µS
Converter