SPI3C

Straight high-frequency pentode designed for RF service in AC/DC receivers and car radios. Mullard documentation places it in radio-frequency signal amplification rather than power-output operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7
Base pins: 7
Nominal heater: 13 V / 200 mA

Description

Straight HF pentode for AC/DC receiver and car-radio RF service.

Socket description

Medium 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7
Base pins: 7
Nominal heater voltage: 13 V
Nominal heater current: 200 mA
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

Max plate voltage: 200 V
Max screen voltage: 200 V

Published valve ratings and characteristics promoted where applicable; additional 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

1958 Mullard Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Application
RF amplifier