Quad Ii Amplifier Schematic. And i still think quad originally meant the 50 to be the successor of the quad ii. The input stage contains two ef86 miniature pentode tubes each of which is capacitor coupled to its own output tetrode tube but only one of which call it input tube no 1 gets the original input signal.
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Quad 405 2 amplifier modification and information from www keith snook info quad ii power amplifier schematic drawing 11175 iss 1 redrawn in original style by keith snook d c daylight ltd. The quad ii like its predecessor embodies outstanding features anticipating trends in both amplifier and associated equipment design. After lots of start up problems with the first series sales were stable but not enough to replace quad ii.
Quad 405 2 amplifier modification and information from www keith snook info quad ii power amplifier schematic drawing 11175 iss 1 redrawn in original style by keith snook d c daylight ltd.
The importance of these features will be apparent to all who have followed the growth of high quality reproduction in recent years. Quad diagrams schematics and service manuals download for free. Michaelaulalice well the danger on the rocks is surely past still i remain tied to the mast. The following information and that on my other pages references component numbers from the quad ii valve power amplifier schematic drawing 11175 issue 1 which you can download from this list how the circuit creates its push pull drive and first stage gain using only 2 ef86 pentode valves is described here.
