@jfrmusic Yes, no-hashtag metoo. I have C7ES’s, lower-back problems, no local dealers, and no family members or local friends who can help me with heavy components.
Last year, I spent several months comparing integrateds for a major upgrade, with an eye on weight. I’ve had Class D amps, but have always found them to be too harsh, grainy, analytical, whatever you want to call it. I understand that newer Class D designs, which use GaN FETs, resolve many of these problems, but have had no opporutnity to hear them myself.
What I found was that the best option was the Ayre line. Ayre’s products are based on the brilliant Charlie Hansen’s adaptation of "diamond" output-stage circuitry, which produces power much more efficiently than do more conventional designs.
E.g., check out Stereophile/Absolute Sound’s reviews of Ayre's EX-8 v.2 integrated, about $10K, 300+ wpc, very broad functionaity & flexible connectivity, and including an integrated DAC that is really quite impressive for an embedded component. All clocking in at 24 pounds, most of which is the weight of the unit’s transformers.
A runner-up, that offers the same rarified class of SQ, is the Hegel line. High-powered, beautifully designed & built, great functionality & connectivity, and even the integrated, I believe, is something like 45 pounds.
Both of these lines have a reputation for being a particularly good match with Harbeths.
If you're considering tubes, there are options like ARC’s $8500 VSi75 & $5500 i/50 integrateds, 50/75wpc & 40/37 pounds -- relatively limited connectivity, and maybe not a great match for the Harbeths' high-end, but still great products.
Bottom line is that llighter-weight products are out there, but there aren’t many. Broader adoption of GaN Class Ds may create more opportunities this year.
I realize that you’ve been bombarded with help since posting your original message, but I hope these suggestions are helpful.