Convert an Adcom 5500 to Aleph J?

Actually , I need to qualify the speaker name , these are not Tekton but they are diy by myself to dimension , with the drivers as stated by various reviewers . B102 and Audax gold tweeter . I guessed at the crossover , running the bass driver to rated 5khz , tweeter comes in at 2khz. My cabinets are mdf overlayed with 1 inch white oak . Exact or not , they better my 3000$ monitors pretty much across the board . At least to my ear .
 
This is an old thread but I'm wondering if anyone has moved on the gfa5500 to class A conversion . If so any details ? I have one sitting around as well , want a first watt 15-25/channel but don't have the budget for it right now. If the conversion is straight forward and yields good results I would head that way .

+1 :D
Here with 555