Data set 01
1953 La Radiotechnique
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Tuning Indicator ·Triode-TuningIndicator
EM81
Green electron-beam tuning indicator for FM/AM receivers that also serves as a recording-level indicator in tape equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 300 mA
Description
The Ferranti EM81 is a green electron-beam tuning indicator for FM/AM receivers and can also serve as a recording-level indicator in tape equipment.
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
- 9
- 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
Triode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
Published section ratings and characteristics promoted where applicable.
Section 2
Tuning Indicator
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 300 V
- Max plate dissipation
- 0.2 W
- Max cathode current
- 3 A
Published section ratings and characteristics promoted where applicable.
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 Tesla
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Data set 03
1963 Philips Electron Tubes Handbook V1a
Published operating points and test conditions from this source.
SECTION 2
Tuning Indicator
Other
Supply voltage
250 V
Indicator
Indicator voltage
250 V
Indicator
Anode resistor
0.5 MOhm
Indicator
Grid resistor
3 MOhm
Indicator
Grid voltage
-1 V
Indicator
Grid voltage
-10.5 V
Indicator
Shadow angle
65 deg
GridVoltage=-1V
Shadow angle
5 deg
GridVoltage=-10.5V
Plate current
0.37 mA
GridVoltage=-1V
Plate current
0.02 mA
GridVoltage=-10.5V
Indicator current
2 mA
GridVoltage=-1V
Indicator current
2.3 mA
GridVoltage=-10.5V
Data set 04
1967 Mullard Receiving and Amplifying Valves
Published operating points and test conditions from this source.
SECTION 2
Tuning Indicator
Other
III
300 mA
Published in approved EM81 target datasheet entry; Section1
It 2.0
2.3 mA
Published in approved EM81 target datasheet entry; Section1
PMmax
200 mW
Published in approved EM81 target datasheet entry; Section1
Ik max
3 mA
Published in approved EM81 target datasheet entry; Section1
Data set 05
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 2
Tuning Indicator
Characteristic
Published electrical datum
250 v
Vy = 250 v
Published electrical datum
250 v
\/} = 250 v
Published electrical datum
0.5 MQ
Ra & 0,5 MQ
Published electrical datum
-
Vg =7 -10,5'V
Published electrical datum
0.02 mA
Ig = 0,37 0,02 mA
Published electrical datum
2.3 mA
Iy = 2,0 2,3 mA
Published electrical datum
250 V
V; =250V
Published electrical datum
-
Vyr(V)—15 —10 =5 0
Other
Published electrical datum
0.2 W
Wa = max. 0,2 W
Published electrical datum
550 V
Vi o = max. 550 V
Published electrical datum
3 ma
Iy = max. 3 ma
Published electrical datum
100 V
Vit = max., 100 V
Published electrical datum
20 kQ
Rgr = max. 20 kQ
Heater voltage
6.3 V
Nominal heater rating
Heater current
300 mA
Nominal heater rating