From: IainNG@kolumbus.fi   
      
   "flipper"  wrote in message   
   news:ekdkv6htbs4io8cobk7to8n1bkgpnvlcb2@4ax.com...   
   > On Thu, 16 Jun 2011 18:49:58 +0300, "Iain Churches"   
   >  wrote:   
   >   
   >>   
   >>"flipper"  wrote in message   
   >>news:798kv6dfpqp0fq9jltafmlbss2hurm9j4i@4ax.com...   
   >>   
   >>> No one said it was for 'home use'. It was offered as an example of   
   >>> "aother fine British valve/tube amp also used by the BBC."   
   >>   
   >>As I mentioned elsewhere, Radford built other amplifiers,   
   >>the STA15 and STA 25 that were designed for home   
   >>use.  In fact the STA25 also found its way into many   
   >>small studios, and was also used to power the BBC   
   >>Radford/Kef monitor speaker.  The amp was clamped   
   >>to a shelf built into the bottom of the speaker stand   
   >>so that it would not get separated. It had a 25 Ohm   
   >>secondary to match the speaker impedance.   
   >   
   > Hmm. Interesting use of a 6U8. I'd not seen a half pentode half triode   
   > LPT/grounded grid phase inverter before.   
      
   Arthur Radford and Dr  Bailey, wrote an interesting   
   article about this topology in Wireless World.  It's a very good   
   series of amps, despite what Phil might say:-).   
      
   See:   
   http://en.wikipedia.org/wiki/Radford_Electronics   
      
      
   Iain   
      
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