VTL's Luke Manley was glowing with some tube warmth himself. "These are the Autobias 450 monoblock amplifiers ($13,500/pair). They have an auto bias circuit, fault monitoring, regulated screen power supply, fully balanced input drivers with their own power supplies, and trickle-current on mute—which keeps you from 'poisoning' your cathode." This last feature prevents you from stressing your tubes on mute and power up, without subjecting them to the stress of hard off and on—"which is a very nice feature. This is a thoroughly modern tube amp."