At the risk of nit picking I'd like to add a minor addition to Stehno and Asi_tek's dialog: Based on discussions with Steve McCormack and a variety of others the SMc Rev. B modded amps are "similar" to the newer production models. That's because several of the Rev. B upgrades were incorporated in the new products. Calling them "equal" is a bit of a misnomer as they do not sound the exactly the same. Which is better, of course, will depend on the listener's preferences and the associated gear.
For more information do a search on Audiogon; there's been a lot of commentary on the entire DNA series as well as the SMcAudio mods.
For more information do a search on Audiogon; there's been a lot of commentary on the entire DNA series as well as the SMcAudio mods.