Data set 01
1955 Lorenz
Published operating points and test conditions from this source.
SECTION 1
Tuning Indicator
Application
Display type
Magic band
Tuning Indicator ·TuningIndicator
EM840
Miniature tuning indicator with a luminous vertical target strip deposited on the glass envelope for compact visual tuning and signal-level indication.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater
- 6.3 V / 270 mA
Description
Miniature tuning indicator with a luminous vertical target strip deposited on the glass.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 270 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
1 physical section, each with unique specifications.
Section 1
Tuning Indicator
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
- Max plate dissipation
- 0.5 W
- Max cathode current
- 2 mA
Published ratings and characteristics promoted from the supplied Brimar source.
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
250 mA
Other
Target Voltage Minimum
150 V
Target Voltage Maximum
300 V