Black Shadow Mk.2

About the Black Shadow Mk.2

The Osiris Audionics Black Shadow Mk.2 appears to be a listing-name variant for the Audion Black Shadow 2 / MkII: a hand-built pair of single-ended, zero-global-negative-feedback 845 triode monoblock amplifiers. Each chassis uses a directly heated 845 output valve in pure Class A operation, with a 6922/6H23N input stage and E182CC driver/buffer stage. It is hard-wired point-to-point, auto-biased, uses solid-state rectification and provides a front-panel Alps Blue Velvet volume control, allowing direct connection of one line-level source per monoblock; a separate preamplifier is nevertheless recommended. Published current-product material describes revised buffer circuitry plus upgraded mains/output transformers and reduced noise versus the earlier Black Shadow. Specifications vary slightly among historical manuals, retailer listings and later reviews; the figures below identify the reported variants where they conflict.