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47E

Brimar companion version of the classic type 47 directly heated audio power pentode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 2.5 V / 1.75 A

Description

Explicit 47E companion designation on the Brimar 47/47E power-pentode sheet, with the same directly heated electrical characteristics.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 2.5 V
Nominal heater current: 1.75 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 60000 Ω
Transconductance: 0.0025 S
Max plate voltage: 250 V
Max screen voltage: 250 V

Published ratings and characteristics promoted semantically from the approved source; identical dual rectifier sections compressed to one representative section row.

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

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
250 V
Plate Current
31 mA
Screen Voltage
250 V
Screen Current
6 mA
Control Grid Voltage
-16.5 V
Optimum Load
7000 ohm
Power Output
2.7 W

Characteristic

Plate Resistance
60000 ohm
Transconductance
2500 µS