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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.
Quad 303 Power Amplifier - Hi-Fi-Insight
http://www.hi-fi-insight.com/quad-303-power-amplifier.html
Quad 303 Power Amplifier. Launched by Quad in the late sixties this amp quickly gained a viable reputation as a great amplifier. Like all Quad's hi-fi it is beautifully designed and engineered and indeed won a Council of Industrial Design Award in 1969. The Quad 303 amplifier was Quad's first solid state amplifier after the success of the Quad 22 valve amp, and was the …
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).
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.
Quad 33 preamplifier, Quad 303 power amplifier
http://www.hembrow.eu/personal/quad33-303.html
The Quad 33 / 303 hifi amplifiers are classic designs. Due to being a relatively early transistor power amplifier design, from the 1960s, when high power complimentary PNP transistors were not so easy to find, they were designed to use a "triplet" circuit instead, with all NPN transistors. This pair of amplifiers came to me through family.
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