250TL

Eimac low-mu transmitting power triode for RF amplifier and oscillator service. Manufacturer operating data emphasize Class-C radio-frequency power generation with substantial plate voltage, current, and output capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: MEDIUM4BAYONET
Base pins: 4
Nominal heater: 5 V / 10.5 A

Description

250TL is a Triode device. Radiation-cooled high-power transmitting triode for RF amplifier/oscillator service; 250TL is listed with 250 W maximum plate dissipation. Published operating, rating, and characteristic data from the supplied page were preserved in the technical output.

Socket description

Medium 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: MEDIUM4BAYONET
Base pins: 4
Nominal heater voltage: 5 V
Nominal heater current: 10.5 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: 0.00265 S
Amplification factor: 14
Max plate voltage: 4000 V
Max plate dissipation: 250 W
Max grid dissipation: 35 W

Published maximum ratings and characteristics audited; additional applicable numerical data retained 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

1950 Eimac Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Voltage
5 V
Voltage - 5.0 volts
Current [1]
10 A
Current - 10 .5 amperes
Current [2]
5 A
Current - 10 .5 amperes
Grid-Plate
3.1
Grid-Plate 3.1 JLJLf
Grid -Filament
3.7
Grid -Filament 3.7 p.p.f
Plate-Filament [1]
0
Plate-Filament - 0 .7 p.p.f
Plate-Filament [2]
7
Plate-Filament - 0 .7 p.p.f
Transconductance ( [1]
11
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Transconductance ( [2]
350
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Transconductance ( [3]
3000
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Transconductance ( [4]
130
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Transconductance ( [5]
26
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Transconductance ( [6]
50
Transconductance (11)=350 ma ., EI>=3000, e c = - 130 ) 26 50 p.mhos
Frequency for Maximum Rat ings
40 MHz
Frequency for Maximum Rat ings 40 mc
D-C Plate Voltage [1]
1500 V
D-C Plate Voltage 1500 2000 3000 3000 volts
D-C Plate Voltage [2]
2000 V
D-C Plate Voltage 1500 2000 3000 3000 volts
D-C Plate Voltage [3]
3000 V
D-C Plate Voltage 1500 2000 3000 3000 volts
D-C Plate Voltage [4]
3000 V
D-C Plate Voltage 1500 2000 3000 3000 volts
Max.-Signal D-C Plate Cu rrent, per t ube" - • • •
350
Max.-Signal D-C Plate Cu rrent, per t ube" - • • • 350 ma o
Plate Dissipa tion, per tube " • • •
250
Plate Dissipa tion, per tube " • • • 250 wat ts
D-C Grid Voltage (approx. ) [1]
40 V
D-C Grid Voltage (approx. ) - 40 - 80 -175 volts
D-C Grid Voltage (approx. ) [2]
80 V
D-C Grid Voltage (approx. ) - 40 - 80 -175 volts
D-C Grid Voltage (approx. ) [3]
-175 V
D-C Grid Voltage (approx. ) - 40 - 80 -175 volts
Peak A-F Grid Input Voltage [1]
770 V
Peak A-F Grid Input Voltage 770 800 840 volts
Peak A-F Grid Input Voltage [2]
800 V
Peak A-F Grid Input Voltage 770 800 840 volts
Peak A-F Grid Input Voltage [3]
840 V
Peak A-F Grid Input Voltage 770 800 840 volts
Z e ro-Sig nal D-C Plate Cu rrent [1]
200
Z e ro-Sig nal D-C Plate Cu rrent - 200 150 100 ma o
Z e ro-Sig nal D-C Plate Cu rrent [2]
150
Z e ro-Sig nal D-C Plate Cu rrent - 200 150 100 ma o
Z e ro-Sig nal D-C Plate Cu rrent [3]
100
Z e ro-Sig nal D-C Plate Cu rrent - 200 150 100 ma o
Max.-Signal D-C Plate Cu rren t [1]
700
Max.-Signal D-C Plate Cu rren t - 700 650 500 ma o
Max.-Signal D-C Plate Cu rren t [2]
650
Max.-Signal D-C Plate Cu rren t - 700 650 500 ma o
Max.-Signal D-C Plate Cu rren t [3]
500
Max.-Signal D-C Plate Cu rren t - 700 650 500 ma o
Ma x.-Signal Driving Power (approx.) [1]
32 W
Ma x.-Signal Driving Power (approx.) - 32 28 17 watts
Ma x.-Signal Driving Power (approx.) [2]
28 W
Ma x.-Signal Driving Power (approx.) - 32 28 17 watts
Ma x.-Signal Driving Power (approx.) [3]
17 W
Ma x.-Signal Driving Power (approx.) - 32 28 17 watts
Effective Load, Plate -to- Plate [1]
3700
Effective Load, Plate -to- Plate - 3700 6150 13000 ohms
Effective Load, Plate -to- Plate [2]
6150
Effective Load, Plate -to- Plate - 3700 6150 13000 ohms
Effective Load, Plate -to- Plate [3]
13000
Effective Load, Plate -to- Plate - 3700 6150 13000 ohms
Max.-S ignal Pla te Power Output [1]
580 W
Max.-S ignal Pla te Power Output 580 800 1000 watts
Max.-S ignal Pla te Power Output [2]
800 W
Max.-S ignal Pla te Power Output 580 800 1000 watts
Max.-S ignal Pla te Power Output [3]
1000 W
Max.-S ignal Pla te Power Output 580 800 1000 watts
D-C Plate Vo ltage [1]
2000
D-C Plate Vo ltage 2000 3000 4000 4000 volts
D-C Plate Vo ltage [2]
3000
D-C Plate Vo ltage 2000 3000 4000 4000 volts
D-C Plate Vo ltage [3]
4000
D-C Plate Vo ltage 2000 3000 4000 4000 volts
D-C Plate Vo ltage [4]
4000
D-C Plate Vo ltage 2000 3000 4000 4000 volts
D-C Plate Curren t [1]
350
D-C Plate Curren t 350 335 310 350 mao
D-C Plate Curren t [2]
335
D-C Plate Curren t 350 335 310 350 mao
D-C Plate Curren t [3]
310
D-C Plate Curren t 350 335 310 350 mao
D-C Plate Curren t [4]
350
D-C Plate Curren t 350 335 310 350 mao
D-C Grid Cu rrent [1]
45
D-C Grid Cu rrent 45 45 40 50 mao
D-C Grid Cu rrent [2]
45
D-C Grid Cu rrent 45 45 40 50 mao
D-C Grid Cu rrent [3]
40
D-C Grid Cu rrent 45 45 40 50 mao
D-C Grid Cu rrent [4]
50
D-C Grid Cu rrent 45 45 40 50 mao
D-C Grid Vol tage [1]
200
D-C Grid Vol tage - 200 - 350 - 500 vol ts
D-C Grid Vol tage [2]
350
D-C Grid Vol tage - 200 - 350 - 500 vol ts
D-C Grid Vol tage [3]
500
D-C Grid Vol tage - 200 - 350 - 500 vol ts
Plate Power Ou tp ut [1]
4 W
Plate Power Ou tp ut - 4 55 750 1000 watts
Plate Power Ou tp ut [2]
55 W
Plate Power Ou tp ut - 4 55 750 1000 watts
Plate Power Ou tp ut [3]
750 W
Plate Power Ou tp ut - 4 55 750 1000 watts
Plate Power Ou tp ut [4]
1000 W
Plate Power Ou tp ut - 4 55 750 1000 watts
Plate Dissipat ion [1]
245
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [2]
2
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [3]
50
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [4]
2
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [5]
50
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [6]
2
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Plate Dissipat ion [7]
50
Plate Dissipat ion - 245 2 50 2 50 2 50 watts
Pea k R. F. Gr id Input Voltage, (approx. ) [1]
575 V
Pea k R. F. Gr id Input Voltage, (approx. ) - 575 720 900 volts
Pea k R. F. Gr id Input Voltage, (approx. ) [2]
720 V
Pea k R. F. Gr id Input Voltage, (approx. ) - 575 720 900 volts
Pea k R. F. Gr id Input Voltage, (approx. ) [3]
900 V
Pea k R. F. Gr id Input Voltage, (approx. ) - 575 720 900 volts
Driving Power, (app rox. l [1]
22 W
Driving Power, (app rox. l 22 29 33 watts
Driving Power, (app rox. l [2]
29 W
Driving Power, (app rox. l 22 29 33 watts
Driving Power, (app rox. l [3]
33 W
Driving Power, (app rox. l 22 29 33 watts
the relationship of plate efficiency, I
7
the relationship of plate efficiency, I- 7'
power output and g rid driv ing power ~ [1]
35 W
power output and g rid driv ing power ~ 35 ........ 6'
power output and g rid driv ing power ~ [2]
6 W
power output and g rid driv ing power ~ 35 ........ 6'
a t plate voltages of [1]
2000 V
a t plate voltages of 2000, 3000 and II: %~:,t~ ~"ll:~:P~~GC:.N-
a t plate voltages of [2]
3000 V
a t plate voltages of 2000, 3000 and II: %~:,t~ ~"ll:~:P~~GC:.N-
plate d issipation in watts is indicated
0
plate d issipation in watts is indicated 0

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
3000 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Plate current
350 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
RF output power
750 W
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid voltage
-500 V
RFAmplifierOrOscillator; ClassC; Telegraphy
Grid current
50 mA
RFAmplifierOrOscillator; ClassC; Telegraphy
Maximum frequency at full input rating
40 MHz

Capacitance

Grid-to-plate capacitance
3.1 pF
Grid-to-filament capacitance
3.7 pF
Plate-to-filament capacitance
0.7 pF

Data set 03

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Frequency for Maximum Ratings
40 MHz

Other

Maximum DC Plate Current
350 mA

Capacitance

Grid-Plate Capacitance
3 pF
Grid-Filament Capacitance
3.7 pF
Plate-Filament Capacitance
0.7 pF