The 3CX2500F3 and 3CX2500H3 are metal-ceramic sealed, forced air-cooled triodes with thoriated tungsten carbide cathode, used in industrial radio frequency heating equipment. Max. working frequency is 75MHz, and Max. anode dissipation power 4kw.
Specifications:
Filament Voltage……7.5V
Filament Current (at 7V)……51.5A
Transconductance……11mA/V
Amplification Factor……22
Interelectrode Capacitances (Grounded-cathode)
Input……35pF Feedback……0.9pF Output……20Pf
Installation……upright
Cooling……forced air
Diameter……105.56mm
Weight……2.8kg
Temperature at anode shell and seals……250℃
Maximum ratings (audio power amplifier or class AB or class B modulator):
Anode Voltage……6kV dc
Anode Current……2.5A dc
Grid Voltage……-1000Vdc
Anode Dissipation……4kW
Grid Dissipation……150W
Typical conditions (dual tubes, unless specified otherwise, sine wave)
|
Anode Voltage
|
4000
|
5000
|
6000Vdc
|
|
Grid Voltage
|
-150
|
-190
|
-240Vdc
|
|
Zero Signal Anode Current
|
0.6
|
0.5
|
0.4Adc
|
|
Signal Anode Current
|
4.0
|
3.2
|
3.0Adc
|
|
Anode Load
|
2200
|
3600
|
4650Ω
|
|
Audio Grid Input (single)
|
340
|
360
|
390V
|
|
signal peak drive
|
340
|
230
|
225W
|
|
Signal Nominal drive
|
170
|
115
|
113W
|
|
Signal Anode Output
|
11
|
11
|
23kW
|
Maximum ratings (Anode Modulated RF Amplifier Class C, Telephone Talking State):
Anode Voltage……5500V dc
Anode Current……2.0A dc
Grid Voltage……-1000Vdc
Anode Dissipation……2670W
Grid Dissipation……150W
Typical conditions (＜30MHz)
|
Anode Voltage
|
4000
|
4500
|
5000Vdc
|
|
Anode Current
|
1.67
|
1.47
|
1.25Adc
|
|
Grid Voltage
|
-450
|
-500
|
-550Vdc
|
|
Grid Current
|
180
|
140
|
150mAdc
|
|
Peak RF Grid Input
|
685
|
715
|
760
|
|
Driving Power
|
125
|
100
|
115 W
|
|
Grid Dissipation
|
43
|
30
|
32 W
|
|
Anode Input
|
6670
|
6615
|
6250 W
|
|
Anode Dissipation
|
1670
|
1315
|
950 W
|
|
Anode Output
|
5000
|
5300
|
5300 W
|
Maximum ratings(RF power amplifier or modulator):
Anode Voltage……6000Vdc
Anode Current……2.5Adc
Grid Voltage……-1000Vdc
Grid Current……0.4Adc
Grid Dissipation……150W
Anode Dissipation……4000W
Typical conditions (＜30MHz)
|
Anode Voltage
|
4000
|
4500
|
5000Vdc
|
|
Anode Current
|
2.5
|
2.5
|
2.08Adc
|
|
Grid Voltage
|
-300
|
-450
|
-500Vdc
|
|
Grid Current
|
245
|
265
|
180mAdc
|
|
Peak RF Grid Input
|
580
|
750
|
765
|
|
Driving Power
|
142
|
197
|
136W
|
|
Grid Dissipation
|
68
|
78
|
46W
|
|
Anode Input
|
10
|
12.5
|
12.5kW
|
|
Anode Output
|
7.5
|
10
|
10kW
|
|
Anode Dissipation
|
2.5
|
2.5
|
2.5kW
|
