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E2D

RFT pentode documented with nominal values, operating characteristics, and maximum ratings. The available source establishes pentode operation but does not clearly identify a specialized functional or cutoff family.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 1.5 A

Description

Pentode vacuum tube for the applications described in the supplied manufacturer datasheet.

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: 4 V
Nominal heater current: 1.5 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 60000 Ω
Transconductance: 0.009 S
Max plate voltage: 275 V
Max screen voltage: 275 V
Max plate dissipation: 10 W
Max screen dissipation: 1.5 W

Published ratings/characteristics promoted where clearly stated; repeated identical sections compressed where applicable.

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 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
4 V
Published nominal value
Heater current
1.5 A
Published nominal value
Transconductance
9000 µS
Published operating characteristic

Other

Maximum plate dissipation
10 W
Published maximum rating