ECC865_RFT

RFT long-life twin triode intended for industrial and professional voltage-amplifier service, emphasizing extended operating life in equipment requiring dependable small-signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 435 mA

Description

Long-life twin triode for industrial and professional voltage-amplifier 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: 435 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3600 Ω
Transconductance: 0.012 S
Amplification factor: 58
Max plate voltage: 250 V
Max plate dissipation: 2.3 W
Max cathode current: 15 mA

Representative section for two electrically similar triodes.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3600 Ω
Transconductance: 0.012 S
Amplification factor: 58
Max plate voltage: 250 V
Max plate dissipation: 2.3 W
Max cathode current: 15 mA

Second physical triode restored.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
435 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
2.3 W
Maximum Cathode Current
42 mA

Characteristic

Transconductance
12000 µS
Typical
Amplification Factor
58
Typical
Plate Resistance
3600 ohm
Typical