Tubes Asylum

• Yes - Sector-7G 16:41:56 08/16/02 (5)
  In Reply to: 6sn7 linestage preamplifier posted by zeno on August 16, 2002 at 13:06:48:

  Hey-Hey!!!,
  Check out the Bottlehead page/forum. THe Schematic for the ForePlay is available with the instruction manual for assembling it. Bigger, higher capacity parts can be had cheaply. I built a similar one with that schamatic running 5687 tubes, Sounds brilliant. Made a few changes,but basic, simple circuitry is probably best. ran across a few others who posted using 6SN7. If you have transformer capacity, there are a whole bunch of tubes that use that basing, in order of decending gain, 6BL7, 6BX7, and the mismatched 6DN7, all share same pinout, but with different specs. THe FP circuit is pretty forgiving though and wil work with B+ betw. 150 and 200( htough caps get a bit more expensive and larger above 200. E-mail me off forum if you want, or jsut ask for more info with next post, I put several on Bottlehead's
  regards,
  Douglas
  
  

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  • prefer 6ns7 linestage pre - Zeno 08:27:03 08/17/02 (4)
    In Reply to: Yes posted by Sector-7G on August 16, 2002 at 16:41:56:

    thank for the input, i prefer 6ns7 line stage pre

    anyone please .....
    
    

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    • Re: prefer 6ns7 linestage pre - Rob F 23:04:16 08/20/02 (2)
      In Reply to: prefer 6ns7 linestage pre posted by Zeno on August 17, 2002 at 08:27:03:

      I've been enjoying the Eric Barbour design that you can find at headwize.com's DIY project section. Built it with a friend last October with bits and pieces he had and a couple of transfomers - one from e-bay, one from a radio club flea, both less than 10 bucks.

      Been having fun finding and trying different 6sn7s since.

      Rob
      
      

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      • Re: prefer 6ns7 linestage pre - zeno 09:01:25 08/21/02 (1)
        In Reply to: Re: prefer 6ns7 linestage pre posted by Rob F on August 20, 2002 at 23:04:16:

        Hi Bob

        how many tube are you using?

        Zeno
        
        

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        • Re: prefer 6ns7 linestage pre - Rob F 18:09:17 08/22/02 (0)
          In Reply to: Re: prefer 6ns7 linestage pre posted by zeno on August 21, 2002 at 09:01:25:

          Six tubes in total. I did not try to use the two 0D3s, but rather used the string of zeners as described in the Eric's text.

          Rob
          
          

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    • What exactly are you asking for? - Sector-7G 09:43:12 08/17/02 (0)
      In Reply to: prefer 6ns7 linestage pre posted by Zeno on August 17, 2002 at 08:27:03:

      I don't quite understand what it is you are asking for. If you rule out the ForePlay because it has 12AU7's in it, then do you rule out all the direct coupled, volt amp to Cathode follower types? This is a simple circuit that has nothing in particular to do with 12AU7 except for it is a cheap, small heater tube that is easy to come by and still sounds great. I agree with you on the 6SN7 issue, likely to sound better... there are other circuits, like a SRPP feeding a cathode follower stage. Are you going to drive your amp off of the plate circuit? Most of the better sounding ones all have the final CF buffer stage to make driving the load easier. Foreplay, Emotive Audio's Sira( got the k$ for that one? ). Anyway, goood hunting, some of the simplest ones sound the best.
      regards,
      Douglas
      
      

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