Novacron Mk. 3.3

About the Novacron Mk. 3.3

The Atma-Sphere Novacron Mk. 3.3 is a pair of high-power, all-tube OTL (output-transformerless) monoblock power amplifiers. It uses Atma-Sphere’s fully balanced differential, direct-coupled Circlotronic® output circuit and operates in Class A. Each monoblock is a dual-mono chassis design built around four 6C33C power triodes and four 6SN7 driver tubes. The current Atma-Sphere Novacron product page identifies a 60 W/channel, 8-ohm version; however, the manufacturer page does not explicitly label that current specification set as “Mk. 3.3.” Therefore, the detailed data below should be treated as the available manufacturer-published Novacron specification, rather than a fully verified historical Mk. 3.3-specific datasheet. Features include copper-foil V-Cap coupling capacitors, Teflon output-tube sockets, manual bias adjustment, onboard VU metering for tube/output monitoring, hand wiring, and no printed circuit boards.