All I could find was this, right next to your thread in a google search
Ayre currently makes two stereo power amplifiers: the VX-R ($14,950 USD) and the VX-5 ($7950). The VX-R, which I reviewed a couple of years ago, belongs to Ayre’s R series, which includes the MX-R mono power amplifier and KX-R Twenty preamplifier. The VX-5 is the only power amp in the 5 series, which includes the AX-5, an integrated amplifier that Uday Reddy reviewed earlier this year, as well as the KX-5 preamplifier, which can be considered the VX-5’s companion model. (Ayre has announced upgrades of the VX-R and MX-R to, respectively, the VX-R Twenty and MX-R Twenty, to be released in a few months. The Twentys feature new circuit designs and new parts that, according to Hansen, will result in price increases of some 50% over the current models. Owners of VX-Rs and MX-Rs will be able to upgrade them for the differences between the old and new prices.)