FC2A

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 / 130 mA

Description

Directly heated octode frequency changer for battery receivers, designed up to 19 Mc/s.

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: 130 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

Plate resistance: 10000000 Ω
Transconductance: 0.00027 S
Max plate voltage: 150 V
Max screen voltage: 150 V
Max plate dissipation: 0.5 W
Max screen dissipation: 0.6 W
Max cathode current: 11 mA

Octode frequency changer; conversion conductance/rp from normal-operation table.

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

Other

Plate voltage
90 V
NormalOperation
Plate voltage
135 V
NormalOperation
Conversion conductance
270 uS
NormalOperation
Plate resistance
10 MOhm
NormalOperation;greater than
Conversion conductance
67 uS
ShortWave
Plate resistance
1.7 MOhm
ShortWave