These classic amplifiers are capable of excellent sound. With our upgrades fitted you will get far more detail throughout the frequency range, greater transparency and a toe-tapping performance with fantastic PRaT. Dynamics are improved dramatically too, and this allied to a much more open and controlled delivery really lets you hear into the recordings.
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 aro..
Our Zero-Compromise upgradel of the Quad 405 featuring the finest components available for the ultimate 405.
Quad 405 Upgrade - Stage 3
Red Hill Audio Quad 405 Dual Mono Power Supply Circuit Board
4 x Mundorf Mlytic AG smoothing capacitors
Power Cabling Upgraded to Red Hill Audio T..
Upgrades for all versions of the Quad 44. Our upgrades again use the finest-sounding components to give a much more detailed and smooth sounding preamp which keeps you listening for hours
Once upgraded the Quad 44 has more detail, more naturalness and improved tonality.
Quad 44 Preamp Upgrade ..
Upgrades for all versions of the Quad 44. Our upgrades again use the finest-sounding components to give a much more detailed and smooth sounding preamp which keeps you listening for hours.
Quad 44 Preamp Upgrade - Stage 2
Increased capacity Low-ESR Power Supply Capacitors
Our Quad 44 Preamp Upgrade - Stage 3 really does have to be heard to be believed! It consists of again replacing critical signal path components and opamps with far superior sounding modern audio types.
The main upgrade however, comes from our incredible off-board power supply.
This external p..
Quad 606 amplifiers represent one of the best hifi bargains around. With its 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 upgra..