The YU-108 (3CX4500F3) is a forced air-cooled medium-power metal ceramic triode with a thoriated-tungsten cathode. When operated at a frequency of 75MHz, the dissipation power for anode is 6kW and 300W for grid. It is mainly used as an oscillator in industrial heating equipment.

In industrial applications, the filament is led out with flexible wires, and the grid is connected to equipment with a solid flange.

 

Specifications:

Filament Voltage……7.0±0.35V

Filament Current (at 7V)……78±3A

Amplification Factor……22

Interelectrode Capacitances (Grounded Filament）

Input……35±5.2pF

Output……0.9±0.3pF

Grid-Anode……20±3.2Pf

Frequency (continuous wave)……75MHz

Installation method……Vertical, anode up or down

Cooling……forced air cooling

Anode Shell Temperature……250℃

Temperature at filament and base connection……150℃

Maximum Length……468.3mm

Maximum Diameter……155.58mm

 

Extreme conditions (Class C telegram 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

Dimensions
	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	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