RD75YB

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: 31.5 V / 235 A

Description

Directly heated 75 kW transmitting triode for RF power amplifier or oscillator service up to 3 MHz; water-cooled anode with forced-air cooling of the envelope and filament terminals.

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: 31.5 V
Nominal heater current: 235 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: 2250 Ω
Amplification factor: 48
Max plate voltage: 20000 V
Max plate dissipation: 75000 W
Max grid dissipation: 3000 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
65 pF
Published interelectrode capacitance
Plate-to-cathode capacitance
7 pF
Published interelectrode capacitance
Plate-to-grid capacitance
45 pF
Published interelectrode capacitance

Other

Maximum frequency
3 MHz
Published maximum/rated frequency
Heater data
30-33 V; 220-250 A
Published heater voltage/current range or limit

Characteristic

Amplification factor range
44-52
Published range
Plate resistance range
2-2.5 kOhm
Published range

Data set 02

1966 Tesla Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
30 to 33 V
Heater current
220 A to 250 A
Maximum plate voltage
20000 V
Maximum plate dissipation
75000 W
Maximum control-grid dissipation
3000 W
Maximum frequency
3 MHz
Maximum plate voltage
17000 V
Oscillator; f < 3 MHz

Capacitance

Grid-cathode capacitance
65 pF
Anode-cathode capacitance
7 pF
Anode-grid capacitance
45 pF

Characteristic

Amplification factor
44 to 52
Published range
Plate resistance
2000 to 2500 ohm
Published range