Restored is a key answer. In a lot of cases the caps and other electronic parts that need replacing, are replaced by modern components because the originals no longer exist. So while you have an old case, inside you have a new modern amp.
Can anything beat Vintage Amps for the $$$?
Restored Fisher, Scott, or Eico integrated amps can all be had for under $500. Do you think any new or used, tube or SS integrated amps can compete in this price range? Any opinions?