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CV789

Sensibly equivalent to:
25TG 3-25D3/25TG 3C24 B1109 HK24G
    
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The CV789 is based on the 3C24 small American transmitting triode. Despite its small size it produces a considerable amount of RF power up to the low VHF region, 100 Watts with 2kV on the anode.
The anode sheet has been formed into deep corrugations before being folded into a cylinder. This ensures good heat radiation. The grid is made in the form of a cage with the wires crossing at the top to close the end. The filament is helical.
The grid is connected to the side terminal and the form of the grid cage and filament is shown.
A closer view.
The wide glass tube envelope is 32 mm in diameter and, excluding the UX4 base pins, is 95 mm tall.
References: Datasheet. Type CV789 was first introduced in 1945.

 

Pin Connections
UX4
1
2
3
4
tc
f+
-
-
f-
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pdiss
Pout
freq
f.max
6.3
3.0
1000
-70
72
1.3W
25W
47W
60MHz
100MHz
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 30, 2014.
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