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Single-ended, it can be done with two (per channel): voltage amplifier (triode) and power amplifier (in some of our cases, this is a triode, as well).A fully tubed stereo amp would have at least 3 tubes. One driver tube like 12AX7 and 2 output tubes like EL34/KT88/6BQ5. An amp like this will have 5 to 25 watts per channel. The term hybrid usually means tube driver and solid state output. Also you are not likely to find any 100 watt amps for less than $1000 even used.
PS Yes, pentodes could be used instead. Even kinkless tetrodes in the output stage, were one to insist.
Oh... they'll know, all righty.Over at Audiokarma, one owner indicates 30-40 hrs to break-in, 100-200hrs to open up and let the musicality shine…..