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Description :
The Quad 606 Power Amplifier is a classic amplifier design from Quad utilising their patented current dumping technology. The current dumping circuit in the Quad 606 Power Amplifier consists of a very high quality low power class A amplifier operating in parallel with a high-power Class AB amplifier. The low-power section controls the loudspeakers at all times, and the high-power section providing the muscle when called for. The Quad 606 Power Amplifier was originally launched in 1987 and essentially was a new improved version of Quad's 405 amplifier with extra oomph and a whopping 140 watts per channel into 8 ohms whose sonic improvement compared to original Quad 405-2 was significant. The Quad 606 Power Amplifier was used by many professionals and broadcasters as well as audiophiles possibly because of the sheer power of this amplifier coupled with Quad's reputation for producing solid well built amplifiers. The Quad 606 was a real power horse intended for driving the ESL-63 and professional speakers.

The Quad 606 gives more body to ESL-63 than the Quad 306. The amplifier really controls the speakers well, giving deep solid bass and crystal clear highs. The transparency that comes from this machine takes the whole set to a new level. Just when the user thought he had to upgrade his speakers, the 606 showed him that there's more in them than he knew. The Quad 606 is excellent, and the difference with others is significant enough to be noticed. At the price range the Quad 606 was launched, many people praised them with very high ratings for value.




The Quad 606 mkI has a totally different sound to Quad 606mkII. The 606mkII was a major improvement upgrade, having a totally different style of mains transformer, increased value smoothing capacitors and other circuit changes too. The Quad 606 mkII has the top corners of the case "beveled at 45 degrees" and is above s/no 21,000. Although several hundred 606 mkII 's escaped in the old cases to use up stock on hand. If the s/n is above 19,500 take the case off and see if it has a torrodial mains transformer (big round thingy), and if so, its a 606mkII.


Specifications :
Power Output........................................140 watts per channel (8 ohms)
Distortion..............................................< 0.01%
Input Sensitivity.....................................500mV
Input Impedence....................................20Kohm
Crosstalk..............................................-100db (100hz), -85db (1 khz) and -65db (10khz)
Hum and Noise......................................105db
Voltage Rating.......................................220-240V AC
Dimensions(w x d x h)............................321 x 238 x 140 mm
Weight..................................................12 kg

Miscellaneous :
Matching...............................................Quad 66 CD Player
             ...............................................Quad 66 Pre-Amplifier
Made in.................................................England
Condition...............................................9 / 10 (Good condition)

Product Information :

Reviews :
http://www.hi-fi-insight.com/quad-606-power-amplifier.html
http://www.audioreview.com/cat/amplification/amplifiers/quad/606/prd_116103_1583crx.aspx