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QEL2250

VHF/UHF power tetrode for RF amplifier, oscillator, frequency-multiplier, and modulator service to approximately 500 MHz. Designed for substantial professional high-frequency output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8G
Base pins: 8
Nominal heater: 6 V / 2.6 A

Description

VHF/UHF tetrode for RF amplifier, oscillator, frequency-multiplier and modulator service to 500 MHz.

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8G
Base pins: 8
Nominal heater voltage: 6 V
Nominal heater current: 2.6 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.012 S
Amplification factor: 5.2
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 250 W
Max screen dissipation: 12 W
Max cathode current: 250 mA

VHF/UHF tetrode for RF amplifier, oscillator, frequency-multiplier and modulator service to 500 MHz.

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

1963 Philips Electron Tubes Handbook V4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Published electrical value
500 MHz
| 500 Mc/s
modulatrice des frequences jusqu'a
500 MHz
| modulatrice des frequences jusqu'a 500 MHz
quenzen bis zu
500 MHz
| quenzen bis zu 500 MHz
Heating : indirect If
2.6 A
| Heating : indirect If = 2.6A
L'utilisation du support
40222 a
Cooling | L'utilisation du support 40222 avec la cheminee est
Published electrical value
40222 a
Cooling | 40222 avec la cheminee
f
300 MHz
Cooling | f 300 Mc/s 300-400 Mc/s 400-500 Mc/s
f
-400 MHz
Cooling | f 300 Mc/s 300-400 Mc/s 400-500 Mc/s
f
-500 MHz
Cooling | f 300 Mc/s 300-400 Mc/s 400-500 Mc/s

Capacitance

Kapazitaten Cg
15.7 pF
Capacitances | Kapazitaten Cg 1 = 15.7 pF
Grid-to-plate capacitance
0.06 pF
Capacitances | Cag1 < 0.06 pF

Other

Typical characteristics Va
500 V
Typical characteristics | Typical characteristics Va = 500V
Plate current
200 mA
Typical characteristics | Ia = 200 mA
Transconductance
12 mA/V
Typical characteristics | S = 12 mA/V
Va W
0 V
Class C telegraphy | Va W0 Va Wo Va Wo Va W0
Plate voltage
2000 V
Maximum ratings | Va = max. 2000 V Vg2 = max. 300 V
Plate voltage
300 V
Maximum ratings | Va = max. 2000 V Vg2 = max. 300 V
Wia max
500 W
Maximum ratings | Wia max. 500 W Wg2 = max. 12W
Wia max
12 W
Maximum ratings | Wia max. 500 W Wg2 = max. 12W
Wa = max
250 W
Maximum ratings | Wa = max. 250 W -VB1 = max. 250 V
Wa = max
250 V
Maximum ratings | Wa = max. 250 W -VB1 = max. 250 V
Plate current
250 mA
Maximum ratings | Ia =. max. 250 mA Wg1 = max. 2W
Plate current
2 W
Maximum ratings | Ia =. max. 250 mA Wg1 = max. 2W
I
500 MHz
Maximum ratings | I = 175 175 175 175 500 Mc/s
Plate voltage
2000 V
Maximum ratings | Va = 2000 1500 1000 500 2000 V
Screen-grid voltage
300 V
Maximum ratings | Vg2 = 250 250 250 250 300 V
Control-grid voltage
-90 V
Maximum ratings | Vg1 = -90 -90 -90 -90 -90 V
Plate current
250 mA
Maximum ratings | Ia = 250 250 250 250 250 mA
Published electrical value
25 mA
Maximum ratings | 35 25 mA
Wg
3 a
Maximum ratings | Wg2 = 4.75 5.25 9.5 8.75 3 a
Wia
500 W
Maximum ratings | Wia = 500 375 250 125 500 W
Published electrical value
225 W
Maximum ratings | = 225 W
Plate voltage
1500 V
Maximum ratings | Va = max. 1500 V Vg2 = max. 300 V
Plate voltage
300 V
Maximum ratings | Va = max. 1500 V Vg2 = max. 300 V
Wia = max
300 W
Maximum ratings | Wia = max. 300 W Wg2 = max. 12 W
Wia = max
12 W
Maximum ratings | Wia = max. 300 W Wg2 = max. 12 W
Control-grid voltage
165 W
Maximum ratings | Wa = max. 165 W -Vg1 = max. 250 V
Control-grid voltage
250 V
Maximum ratings | Wa = max. 165 W -Vg1 = max. 250 V
Plate current
200 mA
Maximum ratings | Ia = max. 200 mA Wg 1 = max. 2 W
Plate current
2 W
Maximum ratings | Ia = max. 200 mA Wg 1 = max. 2 W
f
175 MHz
Maximum ratings | f = 175 175 175 Mc/s
Plate voltage
500 V
Maximum ratings | Va = 1500 1000 500 V
Vg
118 V
Maximum ratings | Vg1p = 117 117 118 V
Plate current
200 mA
Maximum ratings | Ia = 200 200 200 mA
Screen-grid current
31 mA
Maximum ratings | Ig2 = 20 22 31 mA
Control-grid current
15 mA
Maximum ratings | Ig1 = 14 14 15 mA
Wia
100 W
Maximum ratings | Wia = 300 200 100 W
Wa
40 W
Maximum ratings | Wa 65 55 40W
Wmod
50 W
Maximum ratings | Wmod = 150 100 50 W
Plate voltage
2000 V
Maximum ratings | Va = max. 2000 V = max. 400 V
Plate voltage
400 V
Maximum ratings | Va = max. 2000 V = max. 400 V
Elm = max
500 W
Maximum ratings | Elm = max. 500 W = max. 12W
Elm = max
12 W
Maximum ratings | Elm = max. 500 W = max. 12W
Wa = max
250 W
Maximum ratings | Wa = max. 250W Wg1 = max. 2W
Wa = max
2 W
Maximum ratings | Wa = max. 250W Wg1 = max. 2W
Plate current
250 mA
Maximum ratings | Ia = max. 250 mA
Plate voltage
1000 V
Maximum ratings | Va = 2000 1500 1000 V
Vg t
-55 mA
Maximum ratings | Vg t = -55 -55 -55 mA
Vg
25 V
Maximum ratings | Vg1p = 25 25 25V
Plate current
100 mA
Maximum ratings | Ia = 100 100 100 mA
Screen-grid current
-3 mA
Maximum ratings | Ig2 = -4 -3 -3 mA
Wg
1 W
Maximum ratings | Wg2 = 1.4 1 1 W
Wia
100 W
Maximum ratings | Wia = 200 150 100 W
Plate voltage
2000 V
Maximum ratings | Va = max. 2000 V
Wia = max
500 W
Maximum ratings | Wia = max. 500 W
Wa = max
250 W
Maximum ratings | Wa = max. 250 W
Screen-grid voltage
400 V
Maximum ratings | Vg2 = max. 400 V
Wg
12 W
Maximum ratings | Wg2 = max. 12 W
Control-grid voltage
250 V
Maximum ratings | -Vg1 = max. 250 V
f
175 MHz
Maximum ratings | f = 175 175 Mc/s
Plate voltage
1500 V
Maximum ratings | Va = 2000 1500 V
Control-grid voltage
-45 V
Maximum ratings | Vg 1 = -47 -45 V
Plate current
165 mA
Maximum ratings | Ia = 75 250 160 75 250 165 mA
Screen-grid current
-5 mA
Maximum ratings | Ig2 = -1 -7 -5 -2 -4 -5 mA
Control-grid current
0 mA
Maximum ratings | Ig1 = 0 0 0 0 0 0 mA
Wia
250 W
Maximum ratings | Wia = 150 500 320 115 375 250 W
'Aig
0 W
Maximum ratings | 'Aig1 = 0 O 0 0 0 0 W
Wa
140 W
Maximum ratings | Wa = 150 200 170 115 155 140 W
Ao
110 W
Maximum ratings | Ao = 0 300 150 0 220 110 W
Wo peg
220 W
Maximum ratings | Wo peg3)= - - 300 - - 220 W
f
175 MHz
Maximum ratings | f = 175 Mc/s

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater/filament voltage
6 V
Heater/filament current
2.6 A
Transconductance
12000 uS
Screen-grid amplification factor
5.2
Typical plate voltage
500 V
Typical screen-grid voltage
250 V
Typical plate current
200 mA
Minimum waiting time
30 sec

Other

Maximum plate/anode voltage
2000 V
Maximum screen-grid voltage
400 V
Maximum plate/anode dissipation
250 W
Maximum screen-grid dissipation
12 W
Operating plate voltage
2000 V
ClassC;Telegraphy;175MHz
RF output power
390 W
ClassC;Telegraphy;175MHz
Operating plate voltage
2000 V
ClassC;Telegraphy;500MHz
RF output power
225 W
ClassC;Telegraphy;500MHz

Capacitance

Plate/anode capacitance
4.5 pF
Control-grid capacitance
15.7 pF
Plate-grid capacitance
0.06 pF