Tube gear can show up where you least expect it. Last year, I came across a generic-looking piece of mid '60s silver-front audio gear at a ham radio swapmeet, and thought little of it at first, thinking it was early solid-state:
After a few passes, I noticed the Sansui logo on the front panel. I asked the seller about it, and he told me it was a tube amp. I was skeptical at first, until he turned it around to show me the back panel:
Yep, there are tubes in there. After plunking down $100, I brought it home, took the top cover off, and was greeted by this:
Not only tubes, but the largest output iron I've ever seen in an EL84-class amplifier!
Not every obscure generic-looking amplifier is going to turn out to hide a gem behind its front panel, but sometimes, you get lucky.......... 
-Adam
After a few passes, I noticed the Sansui logo on the front panel. I asked the seller about it, and he told me it was a tube amp. I was skeptical at first, until he turned it around to show me the back panel:
Yep, there are tubes in there. After plunking down $100, I brought it home, took the top cover off, and was greeted by this:
Not only tubes, but the largest output iron I've ever seen in an EL84-class amplifier!
-Adam



