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I have rated this as a 7/10 due more to its age, perfect front plate, 2 available one with original box. I have been using them in my own system for a number of years and they work flawlessly. Over the many years I have always used Quad amps from the Quad II, 303, 405, 606 and changing to the new Elite. The matching preamp is also listed here on Audiogon.
Truely an outstanding amplifier, legendry smooth powerful sound. If you are reading this ad then you probably know all there is to know on this amp.
Small amp = small sound? Don't you believe it. The Quad 909 may be relatively small, especially by the standard's of some of its rivals, but play anything large-scale – say, Stravinsky's Rite of Spring – and this dynamic amplifier will take a firm grip of the partnering speakers and produce a sound with impressive authority.
Much of this is down to a rich and weighty bass performance that goes very deep without losing control: even fast-moving rock and rap basslines thunder along and give a firm foundation to a clear and full-bodied midrange.
Outright clarity is good, and there's a strong sense that the amplifier isn't messing around too much with the signal. An even tonal -balance and surefooted sense of -timing complete a strong sonic cocktail.
In common with other 99 Series products, the 909 power amp is built inside a one-piece cast casing, and feels hefty and solid. Within, you get the company's acclaimed ‘current-dumping' design, which actually uses two amplifiers: a very high quality low-power amp provides the signal, and keeps what's going out as close as possible to what's coming in from the preamp, while a high-power section provides the grip to keep the speakers under control.
The result is a relatively compact power amp able to deliver 140W into 8 ohms and 250w into a 4ohm load, and still one of the very best power amps at this price. Listen to it before you buy anything else.