The vintage Quad 405 is still a great sounding amplifier, combining the very best of Quads' legendary design skills and build quality. As with all old hi-fi though, the capacitors inside the Quad 405 will be getting pretty long in the tooth. Electrolytic capacitors really only have a lifespan of around ten to fifteen years, after which the electrolyte dries out, the esr goes up, and the all important sound quality goes down. This degredation in sound quality is so slow and steady, that the owner may not notice the change until it reaches a critical level. Simply replacing the electrolytic capacitors will rejuvenate your Quad 405. In fact, using todays high-quality components, your Quad 405 will sound better than the day it left the factory, and more than capable of showing many modern amplifiers a thing or two!
A complete overhaul of the Quad 405 featuring the finest components available
**NEW 2016 - Dual Mono Power Supply Board is now fitted featuring the superb Mundorf MLytic AG Capacitors**
Listed below is a shortlist of work done for this Stage 2 Upgrade. The end-result is a more open, controlled sound with warmer and more natural tonality. Voices and instruments sound more lifelike and alive.