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

[Hojvaelde]

Hello

One off my freinds have "found" 2 pcs Philips TB2.5 /400 transmitter tubes.
Can I build a singelended amplifier based at this tubes?

Yes I know B+ over 1,5 kV =

I think I will use a KT88 nor EL 34 as driver.

Regards

Benny

 

[audiousername]

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 +V_g 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 🙂

 

[dowdylama]

It looks like it should work well with a B+ of about 600 vdc, and about +25 v on the grid into a 3 k OPT, gapped for approx 200 mA - with some luck, you'll get about 50 W out.

However, I must agree with Jason that this is really not a good project for a novice.

 

[Hojvaelde]

TB2.5 (RIP)



Have just testet my frends valves.

The heating in both valves is dead.

I think there have been 230 VAC at the heater.


Benny

 

[karma]

230 VAC at the heater ouch😀