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Power - Triode Single (under 10W) ·Triode

EC81

Power-capable triode intended for amplifier or driver service. Manufacturer data support moderate-current operation and useful dissipation, but do not justify assignment to the large transmitting or specialized regulator families.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 240 mA

Description

EC81 is listed in the supplied Amperex material as a radiation-cooled UHF power triode. Published operating conditions and electrical characteristics were captured from the supplied tables.

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: 240 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3000 Ω
Transconductance: 0.0055 S
Amplification factor: 16
Max plate voltage: 300 V
Max plate dissipation: 5 W
Max cathode current: 30 mA

Triode section; values semantically promoted from published characteristics/maximum-ratings tables where present.

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 01

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

(750 MHz maximum)
750 MHz
Triode
Tension de l’anode
150 V
Triode
Tension de la grille
2 V
Triode
Courant anodique
30 mA
Triode
Resistance interne
3 kohm
Triode
Tension de l'anode
275 V
Triode
Puissance dissipee sur l'anode
3.5 W
Triode
Courant cathodique
0 mA
Triode
Courant de la grille
7.55 mA
Triode
Tension de la grille
100 V
Triode
Tension de la grille
1.3 V
Triode
Tension entre cathode et filament. Vkf
100 V
Triode
Resistance du circuit de la grille
1 Mohm
Triode
(7150 MHz maximum)
7150 MHz
Triode
Frequence
375 MHz
Triode
Courant anodique
17.2 mA
Triode
Courant de la grille
28 mA
Triode
Puissance d'alimentation
47 W
Triode
Puissance de sortie
21 W
Triode
B. Avec tension de l’anode stabilisee; Vf
63 V
Triode
Courant cathodique
20 mA
Triode
Courant de la grille
75 mA
Triode
Tension entre cathode et filament
100 V
Triode
Tension de l'anode
300 V
Triode
Courant anodique
18.6 mA
Triode
Courant de la grille
15 mA
Triode
Puissance alimentation
56 W
Triode
Puissance de sortie
22 W
Triode
(750 MHz maximum)
750 MHz
Triode
Puissance dissipee sur l'anode
5 W
Triode
Courant cathodique
30 mA
Triode
Tension entre cathode et filament. Vkf
100 V
Triode
Tension de l’'anode
300 V
Triode
Courant anodique
26.3 mA
Triode
Courant de la grille
4 mA
Triode
Puissance d'alimentation
79 W
Triode
Puissance de sortie
38 W
Triode
Yamax
300 V
Triode
Il"
20 mA
Triode

Characteristic

Indirect (cathode isolee du filament)
6.8 V
Triode
Alimentation en parallele ' K —02 A
2 A
Triode

Capacitance

Capacite de la grille
1.8 pF
Triode
Capacite de l'anode
0.7 pF
Triode
Capacite anode-grille
1.6 pF
Triode
Capacite grille-filament
0.25 pF
Triode
Capacite cathode-filament
2.3 pF
Triode

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
300 V
Published table
Maximum plate dissipation
16 W
UHF
Maximum plate current
27.7 mA
UHF
Power output
1.1 W
At 750 MHz
Maximum frequency
1200 MHz
UHF

Characteristic

Transconductance
5500 µS
Published table
Heater/filament voltage
6.3 V
Published rating
Heater/filament current
240 mA
Published rating

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
240 mA
Published heater rating
Transconductance
5500 µS
UHF

Other

Maximum plate dissipation
16 W
UHF
Maximum plate voltage
300 V
UHF
Maximum plate current
27.7 mA
UHF
Power output
1.1 W
At 750 MHz
Maximum frequency
1200 MHz
UHF

Data set 04

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
Grid voltage
-2 V
Plate current
30 mA
Maximum plate voltage
300 V
Maximum plate dissipation
5 W
RF power output
2.1 W
UHFOscillator 80cm
Maximum frequency
750 MHz

Characteristic

Transconductance
5500 uS
Amplification factor
16

Capacitance

Grid capacitance
1.8 pF
Plate capacitance
0.55 pF
Grid-plate capacitance
1.5 pF

Data set 05

1963 Philips Electron Tubes Handbook V3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
175 mA
Published heater rating
Transconductance
5500 µS
UHF
Amplification factor
16
UHF

Other

Plate voltage
150 V
UHF
Grid bias
-2 V
UHF
Plate current
30 mA
UHF

Data set 06

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Typical anode voltage
150 V
Maximum cathode-heater voltage
100 V