I have no affiliation with either seller, but I recognize the photo style, appears to be regular sellers that locals will be familiar with
the 12 in particular looks amazingly clean in the photos
I am tapped out after recent upgrades, otherwise I would be chasing them
https://boston.craigslist.org/nos/ele/d/danvers-vintage-harman-kardon-citation/7481347023.html
https://boston.craigslist.org/sob/ele/d/stoughton-harman-kardon-citation-12/7480933800.html