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

4270A

Directly heated or receiving triode documented by the manufacturer; available source material does not establish a narrower functional category strongly enough for reassignment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
10 V / 9.75 A

Description

The 4270A is a triode described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
10 V
Nominal heater current
9.75 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
12800 Ω
Amplification factor
16
Max plate voltage
3000 V
Max plate dissipation
350 W
Max cathode current
375 mA

Explicit alternate/previous designation printed on 3C350E datasheet.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Total emission

    40 A

    Published datasheet value

  • Grid-anode capacitance

    21 pF

    Published datasheet value

  • Anode-filament capacitance

    2 pF

    Published datasheet value

  • Grid-filament capacitance

    18 pF

    Published datasheet value

Other

  • Maximum frequency for above ratings

    7.5 MHz

    Published datasheet value

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid—filament capacity

    18 pF

    Published interelectrode capacitance

  • Maximum direct anode current

    375 mA

    Maximum safe operating rating

Data set 03

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum frequency at full rating

    7.5 MHz