FC2

Radio receiver frequency changer combining oscillator and mixer functions for superheterodyne conversion. Its multi-grid construction translates incoming RF signals to the intermediate frequency within the receiver front end.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: British7Pin
Socket code: B7
Base pins: 7
Nominal heater: 2 V / 100 mA

Description

Directly heated octode frequency changer for battery superheterodyne receivers.

Socket description

Medium 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: British7Pin
Socket code: B7
Base pins: 7
Nominal heater voltage: 2 V
Nominal heater current: 100 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

British7Pin - 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

Octode

X-ray radiationInterelectrode capacitances

Max plate voltage: 150 V
Max screen voltage: 150 V

Octode frequency changer; published characteristics and limiting values.

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

Octode

Characteristics

Plate voltage
135 V
Oscillator-anode voltage
135 V
Screen-grid voltage
70 V
Plate current
0.95 mA
Conversion conductance
200 uS