• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Can I use Philips TB2.5 /400 in a SE ampl.

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Yes, of course such a thing is possible.

http://www.mif.pg.gda.pl/homepages/frank/sheets/030/t/TB2.5-400.pdf

This will need +Vg to work well, though.

Nonetheless, the fact that you had to ask whether you can make an SE amp from the TB2.5/500 shows that you don't have much experience with such things. Since the drive requirements will be fairly severe (basically a small power amp driving a bigger one, might I suggest to build the driver stage first as a stand alone amp, and you can tack on the high voltage output stage later :)
 
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