Quad 606 modifications

[Lee in Montreal]

On the 606, it is R11 that will alter its sensitivity. Per exemple, a 12 Ohms resistance will give a 0,775 V sensitivity (vs.0,5 V)...

 

[peterfelgate]

There are a number of clones of the 606/707/909 and 520 series eg for the 520:

Audio Club Bulgaria - DIY :: Ïðåãëåä íà òåìà - Ïðîåêòèðàíå íà ïëàòêà çà QUAD 909

Or here with full layout for the 909:

Êëîíèðóåì Quad 909