Need Advice on Amp Audition at a Dealers

thanks to all who took the time to respond. I've been in the hobby a long time and realize a home audition is optimal.  I am hours away from the dealer and a home audition is just not feasible. I want to hear the difference between my current amp and the one I'm considering. I figure this would be a way to hear "differences" even in a strange room and not my gear. If that's a waste of time I guess I forgo the whole experience. Asking the dealers input and "permission" to A-B is a great idea.

thanks again for all the recommendations. Since I can't do a home audition without buying I threw out this post knowing some of you kind souls would help me out. I've just started back again at Audiogon after a long absence. the site now is very different. the "portholes" are pretty weird. Anyway, I owned push pull and set tube amps for 20+ years and decided to try a PS Audio Stellar 300...a class D with about 140 watts a side; this is a seriously good amp. However,  I'm thinking I miss the "fun" of the tube amps (tube rolling etc)  and am interested in auditioning a Rogue Stereo 100 tube amp. My speakers aren't made anymore. I've owned them since 2005 and am still satisfied. The speakers are Von Schweikert db99's and they have internally powered woofers. Best holidays to all of you!