[AMPS] TB 4/1250 datasheet

[Firson, YD1BIH]

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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