Elias from Cyprus upgraded his 303 with the Dada kit.

Elias writes:

"Some time ago I realised that I had to, at least replace, all the electrolytic capacitors in my Quad 303 power amplifier. With that in mind I started searching the internet for possible suppliers, when I came across DADA electronics of Belgium. After studying in deptth their site I decided to purchase their Quad 303 DIY Upgrade kit Deluxe. In addition I opted for a second Nichicon 4700μF capacitor for the power supply,so that I could increase the power reserve of the amplifier and also for new power transistors for both the amplifier and the power supply output stages.

The parts were received in no time after placing my order and straight away I got down to work. I came across some difficulties but these were very quickly resolved by emailing DADA electronics. I must here thank these very courteous people for their so quick service.

After completing the work I calibrated the voltage and quiescent currents and connected the QUAD 303 to my hi-fi system. And what a surprise! It now sounds a much better amplifier than before. I can imagine how much better it would have been had I replaced the amplifier and power supply boards with their high end ones. One day I will do it. But before that I will upgrade my Quad 405, hopefully with DADA's 405 high end boards, BHC Aerovox dual mono power supply unit and loudspeaker protection units."

Stefaan