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Power - Triode (over 1000V 100W) ·Triode

3R280E

Massive water-cooled industrial triode designed for Class C RF-heating oscillator service. Rated for 30 kW plate dissipation, with published conditions producing approximately 61–91 kW RF output at frequencies to about 10 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
8 V / 300 A

Description

The 3R280E is a water-cooled industrial triode for high-power class-C industrial heating oscillator service.

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
8 V
Nominal heater current
300 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
Transconductance
0.075 S
Amplification factor
24
Max plate voltage
13000 V
Max plate dissipation
30000 W
Max grid dissipation
1000 W

Published maximum ratings and characteristics audited; remaining values retained densely in parameter table.

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

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Filament voltage [1]

    8 V

    Filament voltage 8 (45%) V

  • Filament voltage [2]

    45 V

    Filament voltage 8 (45%) V

  • Filament current, nominal (Note [1]

    1 A

    Filament current, nominal (Note 1) 300 A

  • Filament current, nominal (Note [2]

    300 A

    Filament current, nominal (Note 1) 300 A

  • NOTE [1]

    1 ohm

    NOTE 1.--1: is recommended that some resistance or reactance be introduced into the

  • NOTE [2]

    -1 ohm

    NOTE 1.--1: is recommended that some resistance or reactance be introduced into the

  • Mutual conductance

    75 uS

    Mutual conductance 75 mA/Y

  • Grid to anode

    50

    Grid to anode 50 pF

  • Grid to filanrent

    110

    Grid to filanrent 110 pF

  • Anode [1]

    10

    Anode 10 filament 2 pF

  • Anode [2]

    2

    Anode 10 filament 2 pF

  • CN

    2

    CN-2A Filament connector, smaller

  • CN

    2

    CN-2B Filament connector, larger

  • CN

    2

    CN-2C Grid connector

  • voltage plus ripple) o,

    13 kV

    voltage plus ripple) o, 13 kV

  • Maximum direct anode current

    10 mA

    Maximum direct anode current 10 A

  • Maximum direct anode dissipation (continuous)

    30 kW

    Maximum direct anode dissipation (continuous) 30 kw

  • Maximum direct grid dissipation (continuous)

    1 kW

    Maximum direct grid dissipation (continuous) 1 kW

  • Maximum negative grid bias

    15

    Maximum negative grid bias 15 kY

  • Maximum frequency for above ratings

    10 MHz

    Maximum frequency for above ratings 10 MHz

  • Direct anode volti;je [1]

    8 kV

    Direct anode volti;je 8-5 10 12 kv

  • Direct anode volti;je [2]

    -5 kV

    Direct anode volti;je 8-5 10 12 kv

  • Direct anode volti;je [3]

    10 kV

    Direct anode volti;je 8-5 10 12 kv

  • Direct anode volti;je [4]

    12 kV

    Direct anode volti;je 8-5 10 12 kv

  • Direct grid voltage [1]

    610 V

    Direct grid voltage 610 — 670 - 760 \4

  • Direct grid voltage [2]

    670 V

    Direct grid voltage 610 — 670 - 760 \4

  • Direct grid voltage [3]

    760 V

    Direct grid voltage 610 — 670 - 760 \4

  • Direct grid voltage [4]

    4 V

    Direct grid voltage 610 — 670 - 760 \4

  • Direct anode current [1]

    10 A

    Direct anode current 10 10 10 A

  • Direct anode current [2]

    10 A

    Direct anode current 10 10 10 A

  • Direct anode current [3]

    10 A

    Direct anode current 10 10 10 A

  • Peak r.f. grid voltage [1]

    1060 V

    Peak r.f. grid voltage 1060 1120 1210 \

  • Peak r.f. grid voltage [2]

    1120 V

    Peak r.f. grid voltage 1060 1120 1210 \

  • Peak r.f. grid voltage [3]

    1210 V

    Peak r.f. grid voltage 1060 1120 1210 \

  • Direct grid current (Note [1]

    2 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Direct grid current (Note [2]

    1 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Direct grid current (Note [3]

    -4 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Direct grid current (Note [4]

    1 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Direct grid current (Note [5]

    -37 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Direct grid current (Note [6]

    131 A

    Direct grid current (Note 2) 1-4 1-37 131 A

  • Grid resistor [1]

    435

    Grid resistor 435 490 575 Q

  • Grid resistor [2]

    490

    Grid resistor 435 490 575 Q

  • Grid resistor [3]

    575

    Grid resistor 435 490 575 Q

  • Grid dissipation (Note [1]

    2 W

    Grid dissipation (Note 2) 600 600 600 W

  • Grid dissipation (Note [2]

    600 W

    Grid dissipation (Note 2) 600 600 600 W

  • Grid dissipation (Note [3]

    600 W

    Grid dissipation (Note 2) 600 600 600 W

  • Grid dissipation (Note [4]

    600 W

    Grid dissipation (Note 2) 600 600 600 W

  • Anode dissipation [1]

    24 kW

    Anode dissipation 24 26 29 kW

  • Anode dissipation [2]

    26 kW

    Anode dissipation 24 26 29 kW

  • Anode dissipation [3]

    29 kW

    Anode dissipation 24 26 29 kW

  • Power input [1]

    85 kW

    Power input 85 100 120 kW

  • Power input [2]

    100 kW

    Power input 85 100 120 kW

  • Power input [3]

    120 kW

    Power input 85 100 120 kW

  • Power output {oscillator) [1]

    61 kW

    Power output {oscillator) . 61 74 91 kW

  • Power output {oscillator) [2]

    74 kW

    Power output {oscillator) . 61 74 91 kW

  • Power output {oscillator) [3]

    91 kW

    Power output {oscillator) . 61 74 91 kW

  • Power into load at [1]

    85 kW

    Power into load at 85%; transfer efficiency 52 63 77-5 kW

  • Power into load at [2]

    52 kW

    Power into load at 85%; transfer efficiency 52 63 77-5 kW

  • Power into load at [3]

    63 kW

    Power into load at 85%; transfer efficiency 52 63 77-5 kW

  • Power into load at [4]

    77 kW

    Power into load at 85%; transfer efficiency 52 63 77-5 kW

  • Power into load at [5]

    -5 kW

    Power into load at 85%; transfer efficiency 52 63 77-5 kW