Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Heptode
Other
HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
480 mA
Nominal
Characteristic
Conversion Conductance
275 uS
Converter
Voltage - Triode (with diode, heptode or hexode) ·Heptode-Triode
7D7
Receiver oscillator-converter combining local oscillation and signal mixing for superheterodyne frequency conversion. Its multi-grid structure integrates the front-end frequency-changing functions in one envelope.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 7 V / 480 mA
Description
A triode-hexode converter combining an oscillator triode and a hexode mixer section for frequency conversion.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 7 V
- Nominal heater current
- 480 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
2 physical sections, each with unique specifications.
Section 1
Heptode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 1500000 Ω
- Max plate voltage
- 250 V
- Max screen voltage
- 100 V
Hexode converter section; conversion conductance 275 umhos.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 10500 Ω
- Amplification factor
- 17.5
- Max plate voltage
- 150 V
Oscillator triode section.
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.