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4X150A

Sensibly equivalent to:
CV2519 QV1-150A
    
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The 4CX150A beam tetrode is VHF power tetrode and is designed to be operated in a special base and chimney structure. The valve holder has holes in it to allow air to pass through. The air is contained by the chimney so that the forced air cooling is directed over the large surface area of the anode ruff. Normally the chassis would be sealed air tight and a blower attached to provide a powerful air blast.
This form of valve was very successful and made by several manufacturers from this, the smallest size, to very large power valves such as the 4CX35000C bases range from pin types to co-axial rings. Internally the heater is surrounded by two concentric cage grids. See QV1-150A for details of construction.
The base is a glass disc with pins protruding through. The evacuation seal is covered by a central metal spigot.
The spigot connects to the control grid g1 the base ring to the screen grid g2 and the finned top section (radiator) to the anode.
The co-axial envelope is 40 mm in diameter and, excluding the B8F base pins, is 44 mm tall.
Reference: Datasheet.

 

Pin Connections
B8F
1
2
3
4
5
6
7
8
tc
g2
k
h
k
-
k
h
k
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
mAa
Pout
freq
f.max
6.0
2.6
1250
300
150
195
165
500
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 27, 2013.
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