From: IainNG@kolumbus.fi   
      
   "John Byrns"  wrote in message   
   news:byrnsj-135984.09332214062011@news.giganews.com...   
   > In article <95ordmF779U1@mid.individual.net>,   
   > "Phil Allison"  wrote:   
   >   
   >> > The electrolytics are mounted under the chassis and   
   >> > physically very large indeed.   
   >>   
   >>   
   >>    They are far to small  in VALUE  !!!!!!!!!!!!!!!   
   >>   
   >>   
   >> > Driving at 1kHz at 100W, my STA 100B has THD 0.09%   
   >> > Not too shabby, I am sure you will agree:-)   
   >>   
   >>   
   >> ** Not even faintly possible with the schem as published.   
      
      
   LOL :-)   
      
   I thought it was only Stuart Pinkerton who could write   
   a technical review of an amplifier by looking at the schematic.   
      
   Besides, don't you think that Radford's major customers,   
   the BBC, and UK recording studios would have questioned   
   his published spec if it was incorrect?   
      
      
   >>   
   >>    The modulation hum would exceed 1 %.   
   >   
   > You could both be correct, depending on the methods you are using to   
   > measure the   
   > "THD".  Some "THD" measuring instruments don't resolve the modulation   
   > sidebands   
   > around the fundamental as distortion.   
   >   
   > So the question becomes what sort of "THD" measuring kit was Iain using?   
      
   Hello John,   
      
   I have two distortion analysers, HP 332A and Ferrograph RTS.   
   This amp was also loaned to a colleague of mine at Scandi   
   Broadscasting who wanted to hear it driving some large   
   B+  W speakers.  He measured its bandwidth and THD on a   
   KH analyser and gave me the fig of 0.09% which I quoted above.   
   The amplifier's printed specification  is 0.1%   
      
   Regards   
   Iain   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)