What is a good sounding classic tube amps to hunt?

Don't rule out Fisher amps. I have a fisher X-100-B integrated. With a few cheap modifications including bypassing the preamp section, you will have an amp that is not only cheap to buy but cheap to maintain. The output tubes are about $10.00 each and it only needs 4. The amp throws a huge sound stage as well as placement that can't be believed. Every time I put it in my system I get a big smile. It usually stays for a couple of weeks before I go back to the so called better amp. All this from a 40 year old amp, not much has changed in that time. Who says one needs to spend mega bucks to achieve good sound. I bought mine for $400.00 (and I know you can buy them cheaper than that, this one is perfect cosmetically) and with less than $50.00 in parts, wow. Good luck with your search..............Bob