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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.
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.
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
Net Audio - Owners Clubs and Forums - HiFi WigWam
https://www.hifiwigwam.com/forum/topic/123598-net-audio/
Welcome to the WAM! Another option is to consider using a different pre-amp with the 303. I have used a fully modded Net Audio 405-3 with a Fidele Audio modded 34 ST for some time in a few systems. The combo works very well together but IMO, the power amp is the stronger of the two.
Net Audio Quad 33 upgrade PSU
https://theartofsound.net/forum/showthread.php?16860-Net-Audio-Quad-33-upgrade-PSU
My Quad 33/303 have already benefited enormously from the upgrades David Pritchard at Net Audio (www.net-audio.co.uk) has supplied - I was thus very keen to try the new Quad 33 PSU he has recently made available - reading his website it seems that they are all designed to work together to produce an ultra low-noise regulated power supply with all the …
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