Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode (over 1000V 100W) ·Triode

3C270A

Industrial power triode intended for substantial radio-frequency power service. Manufacturer documentation places it in transmitting-class operation, with ratings and operating data centered on high-power RF amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
GIANT4BAYONET
Base pins
4
Nominal heater
14 V / 6.2 A

Description

RF transmitting triode.

Socket description

Giant 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
GIANT4BAYONET
Base pins
4
Nominal heater voltage
14 V
Nominal heater current
6.2 A
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
1900 Ω
Transconductance
0.0084 S
Amplification factor
16
Max plate voltage
3000 V
Max plate dissipation
275 W
Max cathode current
350 mA

Values transcribed from the approved datasheet; additional published data retained as parameters.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid to anode

    19 pF

    Published direct interelectrode capacitance

  • Grid to filament

    14.8 pF

    Published direct interelectrode capacitance

  • Anode to filament

    8.5 pF

    Published direct interelectrode capacitance

  • Heater/filament nominal current

    6.2 A

    Nominal published value

Data set 02

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum frequency at full ratings

    1.5 MHz

  • Push-pull power output

    960 W

    PushPull