The VT200 should be a-ok on the Betas - 200 watts of tube power is fine for the mid/high panels.
Krell Fpb400Cx vs AR Vt-200
I currently use a pair of the Krell Fpb400cx Amps and I have a chance to get a AR Vt-200. This would be used on the mid/high panels of my Infinity IRS Betas. Would this be an improvement over the Krell. The concern is would the Ar provide enough power. I know the panels are power hungry and also the issues with tube Amps, maintenance, tube life. Thanks for any opinions.