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New version of the Quad 33 upgrade-revision manual

05-Sep-2010

A new version of the Quad 33 Upgrade-revision manual with better illustrations is available in the D..

New Blog articles

03-Sep-2010

One about monoblocking two 520f's and a post about measuring distortion with software..

Webshop checkout problem

14-Aug-2010

There has been a software-problem with the checkout procedure in our Webshop the last week. After pl..

Improving the 909

08-Aug-2010

There is a new illustrated article on the Blog (http://quadrevisionspot.blogspot.com/) about improvi..

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New items in the Download section

16-Apr-2010 New items concerning the Quad 510 amplifiers. There are two versions of the 510 circuit, the first is based on the 520, the second on the 520f. Also there are photo's of the output boards.

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