My first rig was an all octal tube PA (two 6L6s of some sort, so between 30W and 50W) into whatever speaker I could get my hands on (so no 30-50W).
Then I got an old tube tape deck, so I used it because I could crank it without frying the speakers. I think it had one 6BQ5/EL84 per channel, so just a few watts.
I was playing guitar at the time. I owned a couple of Kalamazoo 30W bass amps well before I got serious about bass, just because I'm kind of the Kalamazoo amp guy.
When I find the right rig[1] at the right (low) price, I'll get one, just in case I get a chance to use it. The Kal isn't that great, but it works for practice, and at church I go through a SansAmp DI (the head sound guy hates amps on stage).
[1] Still waiting for a neighbor to mention they have an old Ampeg, Sunn, Marshall, or Kustom they need hauled off.