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Power - Triode ·Triode

4356A

Directly heated transmitting power triode intended for RF amplifier, oscillator, or modulator service. Manufacturer operating data emphasize radio-frequency power generation, substantial plate loading, and professional transmitter applications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
5 V / 5 A

Description

4356A printed cross-designation/replacement designation for 3B505E. RF power triode rated for full input to 100 MHz.

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
5 V
Nominal heater current
5 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
12000 Ω
Amplification factor
45
Max plate voltage
1500 V
Max plate dissipation
50 W
Max cathode current
120 mA

Explicit alternate/previous designation printed on 3B505E 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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Grid-anode capacitance

    2.25 pF

    Direct inter-electrode capacitance

  • Grid-filament capacitance

    4 pF

    Direct inter-electrode capacitance

  • Anode-filament capacitance

    0.9 pF

    Direct inter-electrode capacitance

Data set 02

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum frequency at full rating

    100 MHz