Quad 405 Restoration & Upgrade Kits

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-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 should sound better than it did when it left the factory, and more than capable of showing many modern amplifiers a thing or two!

Here at Diy Hi-Fi, we are firm believers in component quality. Yes you can fit standard parts, and yes your amp will sound good, back to its old self, but why not use modern, Audio-Grade components which are made for the job in hand? We have spent many hours evaluating and selecting the finest sounding parts, and feel we now provide best cost/performance ratio for each kit. Using Audio-Grade components will allow the Quad 405 to sound better than ever, with increased levels of detail, lower levels of noise whilst still retaining the classic 405 character.

Quad 405 Upgrade Kit 1

2 x Low ESR 10,000uF 63v Panasonic - C13, C14
2 x Audio-Grade 47uF Panasonic Bi-Polar - C2
2 x 100uF 16v Rubycon ZLH - C5
2 x 47uF 63v Nichicon PM Low Impedence - C10
4 x 47uF 63v Nichicon PM Low Impedence (405-2) - C18, C19
2 x 10uF 63v Bi-Polar (Output Protection Board) - C17 (Quad 405-1)
2 x Capacitor Clips

Optional OPA134 Burr-Brown Opamp + Byapss capacitor Upgrade Available - Only £4

Quad 405 Upgrade Kit 1 £28.00 Quad 405 Upgrade Kit 1 + Opamp Upgrade £34.00

Quad 405 Upgrade Kit 2

2 x Low ESR 10,000uF 63v Panasonic - C13, C14
2 x 47uF 16v Rubycon ZA - C2
2 x 100uF 16v Rubycon ZA - C5
2 x 100uF 63v Nichicon PS Low Impedence - C10
4 x 47uF 63v Nichicon PM Low Impedence (405-2) - C18, C19
2 x 10uF 63v Bi-Polar (Output Protection Board) - C17 (Quad 405-1)
2 x Capacitor Clips

Optional OPA134 Burr-Brown Opamp + Byapss capacitor Upgrade Available - Only £4

Quad 405 Upgrade Kit 2 £36.00 Quad 405 Upgrade Kit 2 + Opamp Upgrade £40.00

Quad 405 Modification Kit 3

2 x 15,000uF 63v F&T Cap - C13, C14
2 x 33uF 25v Rubycon ZA - C2
2 x 100uF 16v Rubycon ZA - C5
2 x 100uF 63v Nichicon PS Low Impedence - C10
4 x 47uF 63v Nichicon PM Low Impedence (405-2) - C18, C19
2 x 10uF 63v Bi-Polar (Output Protection Board) - C17 (Quad 405-1)
2 x 680nF Polypropylene Film - C1
2 x 47nF Polypropylene Film - C4
2 x OPA604 Burr-Brown Opamps & Sockets
2 x 100nF Film Opamp Bypass Capacitors
2 x Capacitor Clips