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   rec.audio.tubes      Tube-based amplifiers... that go to 11      52,877 messages   

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   Message 51,189 of 52,877   
   Alex to All   
   Re: HP 606A mystery attenuator fine adju   
   22 Nov 10 18:41:36   
   
   3a80522d   
   From: apogosso@tpg.com.au   
      
   "Patrick Turner"  wrote in message   
   news:e9addc78-8a69-4f26-9b5c-b021f1de692d@n30g2000vbb.googlegroups.com...   
   > Thus its possible to get full 100% mod with under 1%THD at below 1kHz.   
   > But above 1 kHz, and by about 10kHz, the modulation cannot be   
   > increased to 100% despite all that NFB, more like 50% before THD sets   
   > in bad by 20KHz.   
   > The distortion is a slew rate type and I could not find the cause. The   
   > internal detector workings looked fine.   
      
   Perhaps a load of the modulator is a high-Q LC tank, and it simply can not   
   pass sidebands at high enough AF?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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