RD8XA

Power transmitting triode intended for RF amplification, oscillation, or related professional service. Manufacturer documentation emphasizes radio-frequency operation, useful power output, and transmitter or industrial applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 19.55 V / 70 A

Description

Air-cooled 8 kW transmitting triode for oscillator or RF power-amplifier service in broadcast transmitters up to 3 MHz.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 19.55 V
Nominal heater current: 70 A
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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5200 Ω
Amplification factor: 44
Max plate voltage: 12000 V
Max plate dissipation: 8000 W
Max grid dissipation: 500 W

Published characteristic ranges are preserved in parameters when no single scalar is printed.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid-to-cathode capacitance
26.6 pF
Published interelectrode capacitance
Plate-to-cathode capacitance
1.5 pF
Published interelectrode capacitance
Plate-to-grid capacitance
29.5 pF
Published interelectrode capacitance

Other

Maximum frequency
3 MHz
Published maximum/rated frequency
Heater data
18.5-20.6 V; 66-74 A
Published heater voltage/current range or limit

Characteristic

Amplification factor range
40-48
Published range
Plate resistance range
4.4-6.0 kOhm
Published range

Data set 02

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
18.5 to 20.6 V
Heater current
66 A to 74 A
Maximum plate voltage
12000 V
Maximum plate dissipation
8000 W
Maximum control-grid dissipation
500 W
Maximum frequency
3 MHz

Capacitance

Grid-cathode capacitance
26.6 pF
Anode-cathode capacitance
1.5 pF
Anode-grid capacitance
29.5 pF

Characteristic

Amplification factor
40 to 48
Published range
Plate resistance
4400 to 6000 ohm
Published range