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from Fidele Audio
https://fidele.co.uk/NetAudio/public_html/Amplifiers/quad303upgrade.html
Quad 303 Full Upgrade This full amplifier upgrade is based on the original Net Audio 303 upgrade. Fidele worked with Net Audio on 303 upgrades by providing a build and test service for Net Audio when required. There is a link to Fidele from the Net Audio web site.
Quad 303 Upgrade - How far is too far? | diyAudio
https://www.diyaudio.com/community/threads/quad-303-upgrade-how-far-is-too-far.220120/
Hi, I've owned a 303 for a year or so now, it had the original capacitors so I refurbed it with the Net Audio capacitor kit and replaced the butchered front plate with a home made one which included proper input and output sockets and some decent mains in and out sockets. So it's "sort of" original (at least sound wise).
FS: Quad 33/FM3/303 - fully Net Audio upgraded
https://theartofsound.net/forum/showthread.php?65180-FS-Quad-33-FM3-303-fully-Net-Audio-upgraded
The 33 & 303 have been fully upgraded by Net Audio to the highest level. All the boards in the 33 have been replaced and a new high power PSU fitted. The upgraded tape adapter board allows connection of a digital source. The 303 is upgraded to 303se spec. The exact upgrades are listed on the Net Audio website at http://www.net …
Net Audio - Fidele
https://fidele.co.uk/NetAudio/public_html/
We offer service and repair for any Net Audio or Fidele Audio upgrades as well as offering new Quad upgrades and upgrade parts. We can repair any Quad 33, 34, 44, 303, 405, 306, 606 etc. Below you will find a range of Quad amplifer upgrades based on Net Audio designs and specifications. We offer upgrades and parts for the following amplifers. Quad 303 Amplifer …
Quad 303 - Repair/Upgrade | diyAudio
https://www.diyaudio.com/community/threads/quad-303-repair-upgrade.216228/
The Quad 303 is a single rail power supply item, which regulates the -ve / earth rather than the +ve rail. For this reason attaching it to a computer with a shared earth is NOT recommended. To solve this use the coaxial / optical audio out of the computer to drive a DAC.
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