6FD12

Double-diode pentode combining detector and control-voltage rectification with high-resistance signal amplification. The pentode provides substantial gain while paired diodes support detector and AVC-related functions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Double-diode variable-mu RF pentode for RF or IF amplification and detector service.

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: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

Max cathode current: 0.8 mA
Rectifier peak inverse voltage: 200 V
Rectifier nominal output current: 0.8 mA
Rectifier peak forward current: 5 mA

Published electrical limits and characteristics promoted from the approved source.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 0.8 mA
Rectifier peak inverse voltage: 200 V
Rectifier nominal output current: 0.8 mA
Rectifier peak forward current: 5 mA

Published electrical limits and characteristics promoted from the approved source.

Section 3

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1010000 Ω
Transconductance: 0.00381 S
Amplification factor: 20
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.25 W
Max screen dissipation: 0.45 W
Max cathode current: 16.5 mA

Published electrical limits and characteristics promoted from the approved source.

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

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Cathode Current
0.8 mA
Maximum Peak Inverse Voltage
200 V
Rectified Output Current
0.8 mA
PeakForwardCurrent
5 mA

SECTION 2

Diode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Cathode Current
0.8 mA
Maximum Peak Inverse Voltage
200 V
Rectified Output Current
0.8 mA
PeakForwardCurrent
5 mA

SECTION 3

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
2.25 W
Maximum Screen Dissipation
0.45 W
Maximum Cathode Current
16.5 mA

Characteristic

Transconductance
3810 µS
Typical
Amplification Factor
20
Typical
Plate Resistance
1010000 ohm
Typical