The main differences are the v5 is an awesome amp with evolutionary changes, standard binding posts rather than barrier strips. The v5 has a nice damping factor and circuit boards instead of point to point wiring as in the original 275. The mc275le aniversary is supplied with upgraded binding posts, several internal changes that further enhance the damping factor and a gold plated chassis. To complete the bling thing, green lights are installed below the row of small tubes. The lights can be turned off and there is a new power save feature that shuts down the amp after 30 minutes or so absent an audio signal, mercifully that feature is defeatable. Finally, the v6 is identical to the 275le except for the gold chassis and anniversary badging. They all punch above their 75wpc rating, some say near 100wpc. Ive owned a v4 and a 275le. They are terrific amps and, while not overtly "tubey" or euphonic, they reproduce music in a very pleasing manner. Regards.
