Here is some information about that tube:
TB4/1250
Max:
Frequency 100MHz
Anode voltage: 4000V
Anode dissipation: 450W
Grid dissipation: 50W
Grid current: 115mA
Cathode current: 650mA
Operating conditions:
Va = 3000V
Vg = -375V
Ia = 450mA
Ig = 85mA
Vg (peak) = 580V
Grid input power = 42W
Anode input power = 1350W
Anode dissipation = 300W
Output power = 1050W
Efficiency = 78%
Heating: 10V, 9.9A
Capacitances:
Anode to att other elements except grid: Ca = 0.17pF
Grid to all other elements except anode: Cg = 8.0pF
Anode to grid: Cag = 7.0pF
Amplification factor 28
Mounting position: Vertical with base up or down.
(From "Philips data handbook, book T1, 1989")
"Firson, YD1BIH" wrote:
>
> I found used tube, manufactured by AMPEREX France, Type of the tube is TB
> 4/1250, I do not find a kind of this tube in ARRL handbook datasheet, any
> body know and give me information data sheet for this tube ??..
>
> Thanks in Advance
> Firson - YD1BIH
>
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