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Power - Triode ·Triode

EC157

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
8C18
Socket code
-
Base pins
8
Nominal heater
6.3 V / 735 mA

Description

EC157 is described in the supplied Philips material as a microwave disc-seal triode. Published electrical ratings and characteristics were extracted from the supplied datasheet.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8C18
Socket code
-
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
735 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8C18 - 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
Transconductance
0.021 S
Amplification factor
43
Max plate voltage
300 V
Max plate dissipation
10 W
Max cathode current
70 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

  • (4 000 MHz)

    0 MHz

    Triode

  • Tension de l'anode

    180 V

    Triode

  • Courant anodique

    60 mA

    Triode

  • Tension de la grille

    1.25 V

    Triode

  • Tension de la grille

    2.5 V

    Triode

  • Tension de chauffage

    6.3 V

    Triode

  • Tension de l’anode (courant anod. nul) Va

    500 V

    Triode

  • Tension de l’anode

    300 V

    Triode

  • Puissance dissipee sur l'anode

    10 W

    Triode

  • Courant cathodique

    70 mA

    Triode

  • Courant de la grille

    10 mA

    Triode

  • Puissance d'attaque (grille a lamasse) Pe

    1 W

    Triode

  • Tension continue de la grille (positive) Vg

    5 V

    Triode

  • Tension continue de la grille (negative) Vg

    50 V

    Triode

  • Tension entre cathode et filament

    50 V

    Triode

  • cathode et le filament

    20 kohm

    Triode

  • Tension grille (crete positive)

    20 V

    Triode

  • Tension grille (crete negative)

    100 V

    Triode

  • Puissance dissipee sur la grille

    2 W

    Triode

  • indique les circuits pour le courant continu) (503 A

    60 mA

    Triode

  • 1000 ® pour la

    30 mA

    Triode

  • Dans la plupart des cas un debit de 6 a 10 litres d'air par minute suffit

    6 a

    Triode

  • (4 000 MHz)

    0 MHz

    Triode

Characteristic

  • Indirect (cathode isolee du filament)! Vf

    6.3 V

    Triode

  • Alimentation en parallele, continu ou alternatif. | 1f

    735 mA

    Triode

  • (4 000 MHz)

    0 MHz

    Triode

  • Tension de l'alimentation anodique Vba

    200 V

    Triode

  • Tension d'alimentation de la grille. Vbg

    20 V

    Triode

  • Courant anodique

    30 mA

    Triode

  • Largeur de bande (a—0,1 dB)

    50 MHz

    Triode

  • de puissance de 8dB (V{

    18 W

    Triode

  • de puissance de 6 dB (Vf

    55 W

    Triode

Capacitance

  • Capacite anode-cathode

    35 mpF

    Triode

  • Capacite grille-cathode

    3 pF

    Triode

  • Capacite anode-grille

    1.4 pF

    Triode

Data set 02

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Anode voltage

    180 V

    MicrowaveAmplifier

  • Anode current

    60 mA

    MicrowaveAmplifier

  • Grid bias

    -1.25 V

    MicrowaveAmplifier

  • Operating frequency

    4000 MHz

    GroundedGrid;Broadband

  • Anode supply voltage

    200 V

    GroundedGrid;Broadband

  • Grid supply voltage

    20 V

    GroundedGrid;Broadband

  • Bandwidth

    50 MHz

    GroundedGrid;Broadband

  • Output power at 8 dB gain

    1.8 W

    GroundedGrid;60mA

  • Output power at 6 dB gain

    0.5 W

    GroundedGrid;30mA

  • Power gain at 1 mW drive

    13 dB

    GroundedGrid

Characteristic

  • Transconductance

    21000 µS

    Section1

  • Amplification factor

    43

    Section1

Capacitance

  • Anode-to-grid capacitance

    1.4 pF

    Section1

  • Anode-to-cathode capacitance

    0.035 pF

    Section1

  • Grid-to-cathode capacitance

    3 pF

    Section1

Data set 03

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

    735 mA

    Published heater rating

  • Transconductance

    21000 µS

    MicrowaveTriode

  • Amplification factor

    43

    MicrowaveTriode

Other

  • Plate voltage

    180 V

    MicrowaveTriode

  • Plate current

    60 mA

    MicrowaveTriode

  • Grid bias

    -1.25 V

    MicrowaveTriode

Capacitance

  • Grid-to-plate capacitance

    1.4 pF

    Published

  • Plate-to-cathode capacitance

    0.035 pF

    Published

Data set 04

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Typical anode voltage

    180 V

    GroundedGrid

  • Typical anode current

    60 mA

    GroundedGrid

Characteristic

  • Anode-grid capacitance

    1.4 pF