getting off into the weeds now, or just full circle? The first 'amp' I used (40+ years ago) was a Panasonic cassette tape recorder, I think I did accidentally find the 'amp function' of pushing record with no tape installed, with the junky Silvertone Jazzmaster my older cousin gave me (the Panasonic is the preamble, not the point of the story).
Going through my stuff over the past couple of weeks, I have a Wollensak T-1500 reel to reel tape recorder/player, the price tag reads $12, I I think I got it at a thrift store 10-20 years ago, I think. .
It has tube preamp: a pair of 12ax7s and a 12at7, and a pair of 12AB5 power tubes (if my notes are correct), with fixed adjustable bias. The preamp tubes are all shock mounted which seems pretty trick, and it has a good sized built in cooling fan (I'm having a little trouble getting the fan to not bump into anything and make a bad metal to metal sound, but when I do get it adjusted right...). It has a built-in 5" speaker, a 1/4" input, and a 1/4" external speaker out.
it doesn't sound bad!, with a higher gain pedal like a tech21 Tri OD it sounds good, and is really fun at bedroom volumes, there's lots of these around, but everyone is asking $100. Through my 1x12 cabinet it's pretty boomy in the low end, an eq fixes that easily. Keep an eye out while you're garage/estate sale-ing. I plan to keep this and use it, I think the other end of the fan is causing the trouble, and it's a little bit tricky to access.