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Edited article Pro & Cons power suply design from december 2008
03-Jun-2010The article about the design of the power suply of a 606 is edited, at last the useful comments of P..
Revised FM3 Service Notes
10-May-2010Esmond made a revision of his FM3 Service Notes, see the blog..
Quad 520f revision and monoblock conversion
28-Apr-2010Joost Plugge wrote a Weblog article about the revision and upgrade of the Quad 520f professional amp..
New items in the Download section
16-Apr-2010New items concerning the Quad 510 amplifiers. There are two versions of the 510 circuit, the first i..
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