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Yes it will work as an audio amplifier, about 2 watts of audio out. It needs 6.3V for the filaments and about 250V for the plate. It will also require a output step down transformer to match the output impedance to the impedance of a speaker.
I would use 4 of them. 2 in parallel and 2 in parallel with the two groups in pushpull in class B configuration and you could get about 10 watts out of them.
Thanks again, any chance that you might have a schematic of some source about this kind of an amp ?
I agree with Nigel. There must be many power tetrode amplifier circuits on the web. As far as the output transformer is concerned you my do a search for Hammond transformers. As I recall they are located in Canada and still produce audio output transformers.