Quad 606 Mk2 / 707 / 909 / Elite amplifiers represent one of the best hifi bargains around. With their roots in the amazing 405, the circuit has been refined for improved sound-quality.
With a large transformer and space for larger power smoothing capacitors it is a robust sounding candidate for upgrade.
With our upgrades applied, the Quad 606 Mk2 / 707 / 909 / Elite gets smoother, slightly more detailed and has more air & space around instruments. The improved and additional capacitors remove more noise and ripple from the power rails improving every aspect of the sound. You get greater transparency and a cleaner sound which keeps you listening for long periods with no listening fatigue.
The Stage 2 upgrade improves things further with extra power supply filtering. We also add two of our mini-shunt voltage regulators to the input stage. This improves clarity and small-scale dynamic shading and really does provide a more natural sound.
Quad 606 mk2 707 909 Power Amp Upgrade - Stage 2
Mundorf MLytic AG Low-ESR/ESL power supply smoothing capacitors
Elna Cerafine audio-grade electrolytic capacitors
Additional High Quality PPS Film Capacitor decoupling added