I'm 58, started with tubes at age 16, went SS later but was never really happy. Now I have tubes again and I love them. I think the Rogue Cronus is a good suggestion and so is the Audio Space AS-3i. Both unfortunately near the top end of your budget if you can find them used.
Another good brand which was marketed for a while here in Canada is Passion Audio. The i-11 model is a bit better-sounding than the i-10 and should still be close to the low end of your budget. These amps were produced by Antique Sound Labs and voilĂ , that's another brand you might consider and a little easier to find.
Remember the output transformer is the key to sound quality in a tube amp. I recommend the Audio Space and Passion units for that reason. I have heard the Cronus briefly at a show and liked it but I didn't get to ask about it.
Another good brand which was marketed for a while here in Canada is Passion Audio. The i-11 model is a bit better-sounding than the i-10 and should still be close to the low end of your budget. These amps were produced by Antique Sound Labs and voilĂ , that's another brand you might consider and a little easier to find.
Remember the output transformer is the key to sound quality in a tube amp. I recommend the Audio Space and Passion units for that reason. I have heard the Cronus briefly at a show and liked it but I didn't get to ask about it.