What is a good sounding classic tube amps to hunt?

Hi Gonglee. Not sure about the rouge stuff but any of the classic amplifiers on your list would partner very well with most any the alnico based JBL's from the same era. I am assuming you are thinking tube amplifiers here however I seriously doubt you will find a classic tube amp from the likes of Marantz, Mac or Quad for under $500. That said, the little sherwood S5000 is a honey of an amp as well as the grommes stuff already mentioned. Others to consider are the eico integrated's as well as the classic Fisher 400 receiver which will allow you the luxury of a top shelf tuner to boot. Best of luck on your journey.

Sincere thanks to all who posted - I am a poor musician with good ears ( I like to think ), so I need advices like this, if I am going to enjoy good sounds on small budget.

Words of experience are in-valuable for a poor musician who needs good sounds to further his education.

Thanks again ...

Onix SP-3 is a 38 watt tubed integrated that will outperform all the classics. Only 2 inputs and 1 output but build quality and sound that ranks at premium level. Can be found used on this site for as little as $500.