AI-generated product photo — not official manufacturer imagery.
Estimated price (community-sourced)
Around — community and catalog average, updates slowly
About the II Forty
The Quad II Forty (also styled QII-Forty) is a single-channel, transformer-coupled valve power-amplifier monoblock and a modern descendant of Peter Walker’s classic Quad II. It uses a push-pull KT88 output stage, a 5U4G valve rectifier, and military-specification 6SH7 input valves. Hardwired construction, choke-filtered high-tension supply, automatic output-valve biasing, custom output transformers, and gold-plated terminals are among its design features. Each amplifier delivers 40 watts RMS and provides selectable 4-ohm and 8-ohm loudspeaker taps; stereo systems require two monoblocks. The amplifier is listed on Quad’s current website, although its original production dates to the early 2000s and availability may depend on region and remaining stock.
Specifications
Key Specifications
Full structured specifications are available to members.
Sign up to see full specifications