From: spam@spam.com   
      
   On Sun, 4 Sep 2011 22:05:12 +0000, John L Stewart   
    wrote:   
      
   >   
   >The drive requirements of the OP stage are not as critical as mentioned   
   >in earlier posts. The KT88, EL34 & 6550 all have G about double that   
   >found in the original Mullard circuits where we find 6L6, 5881, Etc.   
   >   
   >A single dominant pole is a safe way to go in this cct. There are a   
   >couple of worked samples in RDH4 worth looking at.   
   >   
   >Also strongly recommended by none other then Norman Crowhurst. You can   
   >read about how to implement all in a couple of his articles.   
   >   
   >I like the cct proposed by Alex Pogossov recently. The attachment shows   
   >how it is connected in an SE Amp. The frequency selective network is in   
   >the cathode of the first stage rather than between stages.   
   >   
   >My opinion, anyway, having done it.   
   >   
   >Cheers, John Stewart   
   >   
   >PS- The bicycle went more than 1000 KM in August (622 miles). Pedalling   
   >again today. Hey Patrick, hows it going in OZ?                J   
   >   
   >   
   >+-------------------------------------------------------------------+   
   >|Filename: Alex Pogossovs Solution.jpg                              |   
   >|Download: http://www.audiobanter.com/attachment.php?attachmentid=245|   
   >+-------------------------------------------------------------------+   
      
   Why would you want a circuit that drops the gain by about 16dB at   
   100Hz? What is its actual purpose?   
      
   d   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)