Sell or save

I would say if you have the space in your house keep the Jolida 502 integrated you have. How old is it? The Jolida 502P I have from a couple of years ago is the amp section of the Jolida 502CRC Integrated and it can handle Tung Sol 150 tubes. With those tubes in your Jolida you can handle lots of speakers out there.

Regarding the sale value you will take it on the chin if you try to sell it. I've seen some Jolida 502 series amps used go for under $700 which is a steal IMO. You can try various sites like Craigslist but I just have mixed results selling audio gear on there. Lots of flakes, spam and the usual lowballers.

I keep spare amps to just mix things up and should an amp go which has happened I'll always have something to keep my speakers singing.

If you are not in need of the $$$, I would keep it unless you get a chance for a local sale.  As you say, to package and ship would be costly and always has risk.

I was just going through the same process. Through the never ending upgrade process, I ended up with an extra Parasound Halo Integrated, Mark Levinson 23.5 and Spectral DMC-20. I am on the fence about selling any of them, but I hate having them sit around not fulfilling their destiny of spreading musical sunshine.

I will most likely end up selling the Parasound and Spectral since they are redundant, and keep the ML 23.5 because it is such a sweet amp and it’ll be harder to replace in the future.

Keep it if you can or list it on Audio Asylum. I don't think they charge a fee and get good traffic.