Innovative Adaptive AutoBias A PrimaLuna exclusive. If anybody tells you that they have auto bias, ask them precisely how. It's most likely not true. As with all PrimaLuna amps, you never have to worry about biasing your amp ever again, and the need for matched tubes is eliminated. Just plug in a myriad of different tubes including EL34, KT88, or KT120 (the cage must be left off to use KT120) and AAB does the rest while improving sound quality. Tubes are constantly monitored and kept in their best operating range, reducing distortion by up to 50%
ALPS Blue Velvet volume control tracks better so a defined stereo image is established and doesn't collapse as you raise and lower volume. And it will stay quiet, adhering to PrimaLuna's guiding principle of "Built to last a lifetime".
Soft-start circuit Extends component and tube life by powering up the amp gently every time you turn it on.
Custom designed output transformers Encapsulated low hum, wide bandwidth for great bass and extended highs. Designed by Marcel Croese and one of the most prestigious transformer designers in the USA .
Premium parts. Upgraded Solen capacitors made in France for beauty and fast recovery diodes to keep control when music gets busy.&
Panel mounted ceramic tube sockets and rear jacks.
Point to point wiring. The ProLogue Classic is a work of art with internal construction you won't find elsewhere. It takes more time to build, and is assembled by artisans, but it will last a lifetime.
Chassis made of finely finished heavy gauge steel, and five step automotive quality finish. Each coat hand rubbed and polished. Removable tube cage included no charge.
Toroidal power transformer for low hum, and a front end that is dead quiet.