The 3CX2500A3 and TH5-6 are metal-ceramic sealed, forced air-cooled triodes with thoriated tungsten carbide cathode. The filament and grid are coaxial structured with low distributed inductance. The operating frequency can reach 110MHz, and the anode dissipation power is 4kW. They are intended for FM, AM, TV and industrial heating equipment. The tube core of TH5-6 has a radiator, which improves the cooling performance of the cathode and is suitable for dusty environment.
Specifications:
Filament Voltage……7.5V
Filament Current (at 7V)……51.5A
Transconductance……20mA/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 (class C anode modulated RF amplifier, 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
|
