Inspired by reading the recent coffee-table book on QUAD and after a year of thinking about it I figured out how to drive the QUAD 57…

I have written several times on this topic, anyone interested in the finer points of tube matching should read them…

Although solid state amplifiers are normally bridged into mono, the same does not apply to tube amplifiers…

Now I suppose I should say where damping comes from. It is most easily obtained by use of feedback, lots of feedback…

A very intelligent man who happens to be my distributor in Northern Europe called today because he wanted to….