Hi! I'm building a mono speaker out of an old analog radio.. Basically ripping all the insides out, and replacing with a small amp to drive the speaker from MP3 source, with 1/8" or rca cables. Now the radio has this nice analog sound quality which i'm trying to replicate. What kind of amp should I look for? Will regular cheap TDA's sound good with the sensitive vintage speaker? Class A design, I think, would be preferred. I'm looking to spend 20-30£ max for this project, so probably no tubes.