Supply and demand is really what will determine resale value of anything.
Colelctor items aside, newer, proven brands/products in good condition that offer good value to start will hold value best. Agon bluebook resale prices would be the place to look to find out what those are.
Does tube gear really have an advantage? Anything concrete to back that up? I suppose only the data in the agon bluebook database might say for sure. That or any similar data that ebay might retain and make available.
Colelctor items aside, newer, proven brands/products in good condition that offer good value to start will hold value best. Agon bluebook resale prices would be the place to look to find out what those are.
Does tube gear really have an advantage? Anything concrete to back that up? I suppose only the data in the agon bluebook database might say for sure. That or any similar data that ebay might retain and make available.