Data set 01
1955 Lorenz
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Application
Display type
Magic fan
Tuning Indicator ·Triode-TuningIndicator
EM71
Electron-ray tuning indicator for visual receiver tuning and signal-level indication using a fluorescent display system.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B8G
- Base pins
- -
- Nominal heater
- 6.3 V / 300 mA
Description
Tuning indicator with 250 V target supply and approximately -20 V grid voltage for zero shadow.
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
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 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
Tuning Indicator
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 500 V
- Max plate dissipation
- 0.5 W
- Max cathode current
- 6 mA
Published ratings and characteristics promoted from the supplied Brimar source.
Section 2
Triode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this 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.
Data set 02
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Characteristic
Heater Voltage
6.3 V
Heater Current
300 mA
Target Voltage
250 V
GridVoltageForZeroShadow
-20 V