XPost: sci.electronics.design   
      
   On Mon, 31 Dec 2018 11:14:33 -0800, Big Bad Bob   
    wrote:   
      
   >On 12/29/18 10:27, Tauno Voipio wrote:   
   >> On 29.12.18 01:32, Chris wrote:   
      
      
      
      
   >>> If you want to see an interesting audio amp, look up the Editors and   
   >>> Engineers Radio Handbook from the mid 60's. There's a design that   
   >>> which uses 6 or 8 6080 double triodes to build a direct coupled   
   >>> amplifier, no output transformer and dual power rails, positive and   
   >>> negative. Never built built it here, but a very original design. Could   
   >>> probably update that to use power mosfets...   
   >>   
   >> I found it in my copy, 16th edition, 1963.   
   >>   
   >> The amplifier is not direct coupled, there are several stages   
   >> with coupling capacitors. The final is series-connected with   
   >> 3 series pairs of 6082 triodes in parallel and direct feed to   
   >> a 16 ohm speaker. The power supplies are + and - 140 V.   
   >>   
   >   
   >sounds like a gimmick.  Tube plate/cathode currents are just way too   
   >small to properly drive a speaker without an impedence matching transformer.   
      
   Search for 6082 "50 ohm" and you find quite a lot hits with single   
   pair driving 50 ohms.   
      
   With tree pairs, the load could be 16 ohms.   
      
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