The YU-108 (3CX4500F3) is a forced air-cooled medium-power metal-ceramic-sealed triode with a thoriated-tungsten cathode. When operated at a frequency of 75MHz, the anode dissipation power is 6kW and 300W for grid. It is mainly used as an oscillator in industrial heating equipment.
In industrial applications, the filament is connected with soft lead, and the grid is connected to equipment via a solid flange.
Specifications:
Filament Voltage……7.0±0.35V
Filament Current (at 7V)……78±3A
Amplification Factor……22
Interelectrode Capacitances (Grounded cathode）
Input……35±5.2pF, Output……0.9±0.3pF, Grid-Anode……20±3.2Pf
Frequency (continuous wave)……75MHz
Mounting……upright
Cooling……forced air cooling
Anode Shell Temperature……250℃
Temperature at filament and base joints……150℃
Maximum Length……468.3mm
Maximum Diameter……155.58mm
Maximum ratings (Class C telegraphy or frequency modulation)
DC Anode Voltage……9000V
DC Grid Voltage……-1000V
DC Anode Current……3.0A
DC Grid Current……0.8A
Grid Dissipation……300W
Anode Dissipation……6 kW
Typical conditions (Class C, radio frequency power amplifier or oscillator)
Anode Voltage……8000Vdc
Anode Current……2.75Adc
Grid Voltage……－705Vdc
Grid Current……0.68Adc
Peak Grid Voltage……346V
Driving Power……710W
Anode Input Power……22KW
Anode Dissipation……4.8KW
Anode Output Power……15KW
Load Resistance……1437Ω (approx.)
Grid Resistance……1040Ω
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Dimensions
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| |
Min. Value
|
Value
|
|
Min. Value
|
Value
|
|
A
|
φ152.4
|
φ155.58
|
L
|
|
84.5
|
|
B
|
φ19.8
|
φ21.4
|
M
|
17.5
|
20.6
|
|
C
|
φ107.4
|
φ108.1
|
P
|
203.2
|
228.6
|
|
D
|
φ5.84
|
φ6.73
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S
|
25.4
|
28.6
|
|
G
|
φ97.9
|
φ98.7
|
U
|
227.0
|
239.7
|
|
H
|
43.3
|
49.6
|
W
|
φ9.78
|
φ10.1
|
|
K
|
98.4
|
107.9
|
Z
|
177.8
|
190.5
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