An Integrated to replace Adcom 555II & 500II ??

When Stereophile reviewed the Aerial 5 in 1997, they preferred driving it with a Classe CAP-100 integrated. Of course, you have lots alternatives 12 years later, but the reviewer said this:

"I must reiterate the 5's need for a substantial power amplifier: Don't even think about running the 5s with fewer than 50Wpc."

I agree with Darkmoebius. Most people don't find Adcom gear to be warm. Have you heard your speakers with anything other than Adcom and HK? I think you'll be surprised with their hidden potential. A better quality amp will offer a more refined and nuanced presentation. Certain amps are smoother and less fatiguing than others. Plinius 9100 is an excellent suggestion.

I realize tubes aren't for everyone and aren't always the best tool for the job, but I'm inclined to steer you toward a Cary SLI-80. There's one in the classifieds at the top end of your price point. I think it would be a sweet compliment with your speakers.

Hi Manto,there is a used Plinius 9100($1,500) and four MF A5's beteen $1,100-$1,500 for sale here on Audiogon. Also, a used MF A308($1,600)

Used Simaudio i-3 SE ($1,490) might be worth considering

Used PS Audio GCC-100

Manto, don't miss this. It came up today and won't last long. I have no affiliation with the seller.

CLASSE CAP-150 Integrated Amp

Yowsa, that's a screaming deal, Mingles.

Manto, jump all over that. Seriously, Classe makes some amazing gear and power is their trademark.