10FD12

Combination sharp-characteristic pentode and two diodes for receiver signal amplification, detection, and control functions. The pentode provides voltage gain while the diode sections handle detector and rectification duties.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 19 V / 100 mA

Description

Dual-diode variable-mu RF pentode for RF/IF amplifier-detector service; source also designates 10FD12.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 19 V
Nominal heater current: 100 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

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

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

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 600000 Ω
Transconductance: 0.0045 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 2.25 W
Max screen dissipation: 0.45 W
Max cathode current: 16.5 mA

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

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added in approved section-structure reconciliation.

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

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater or filament voltage
19 V
Published nominal value
Heater or filament current
100 mA
Published nominal value

SECTION 2

Pentode

Characteristics

Heater or filament voltage
19 V
Published nominal value
Heater or filament current
100 mA
Published nominal value
Transconductance
4500 µS
Published operating characteristic

Other

Maximum plate dissipation
2.25 W
Published maximum rating