Technically, my first "amp" was one of those hokey Marshall 1W micro amps (complete with a belt clip on the back for untethered busking) from back when they were still a new thing:
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I still have that little Marshall fart box! As long as I put it on the clean channel, I can feed my pedals into it and it's adequate as a little practice amp for jamming in the backyard while keeping an eye on the kids when they're playing. I still like my Blackstar FLY better, though. Same concept (run pedals, not the onboard effects), but the Blackstar has more beef in volume and overall tone.
A little more brutal on batteries, though.
My first actual amp was a little 15-watt Crate fart box. I think it was something like a 1x8,
maybe 1x10 on the outside.
My second amp was a larger Crate 2x12. I forget the power draw on that one, but it at least had enough beef to get over a drummer in the 2-3 times I actually used it in a band scenario.
When I auditioned for a modern rock band for the bass position once, I didn't have a proper bass amp at the time, so I lugged that guitar amp to the audition. It was still just enough to be heard since it was a basement audition without blowing the speakers out from my bass. After going through their album tracks, we just started an impromptu blues jam. Since that went so well and it seemed like I was going to get the job, I went out and bought a 1x15 cab and 400-watt bass head.
Then I got the message from the singer/bandleader that their original bass player's medical conditions "suddenly" cleared up and he wanted to come back to the band. Yeah, he felt threatened that the band called his bluff and was going to move on without him with me in place instead. Both the singer and the guitarist said that I was the only one who showed up to the audition prepared and having learned their songs so they felt bad about breaking the news to me.
Could've also been part of the bluff, I don't know.
Sold that rig soon after since I knew that was going to be my last opportunity to be in a situation to play real gigs anyway.
Nowadays, it's either the Blackstar practice amps, a 40-watt Fender combo amp for my guitars, or a 1x12 bass combo amp. No need to kill the volume since it's just me playing in the house.
On a tangential note, I have an I-have-no-idea-how-many-channels rackmount Tapco EQ (the discount brand of Mackie). It was a factory second that they just tossed in their "please get rid of these, we don't care how" room, so my sister, who was working for Mackie at the time, grabbed it and sent it to me. All it needed was some replacement standoff screws to reattach the front face plate. And since that was the time period in IT that computer hardware was still a relevant skill, I had plenty of access to standoff screws. So now I have a nice I-have-no-idea-how-many-channels rackmount EQ.