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(re)building an inexpensive tube phono stage

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  • Jim
    Building a great sounding, (relatively) inexpensive tube phono stage Home page photo and in our Photos section under Dyna PAS Phono only The first leg (of
    Message 1 of 4 , Oct 10, 2007
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      Building a great sounding, (relatively) inexpensive tube phono stage
       
                     Home page photo and in our Photos section under "Dyna PAS Phono only"
      The first leg (of the PS) has two 47 uf at 250 volt in series with resistors across them to equalize the voltage drop over each cap. Making it about 24 uf at 500 volt.  Well above Dyna's B+ for each leg.
      The second leg is 33 uf at 630 volt. Making it 33 uf at 630 volt
      The last leg is two 20 uf at 400 volt in parallel. Making it 40 uf at 400 volt.  Voltage on this leg of the circuit  is below 250 volts even at turn on. 
      This is similar to the original capacitance rating. But notice each  leg consecutive has a higher capacitance rating in uf than the former. This gleaned from an article, with measurements. I read that if you make each leg larger than the last, you have a smoother, more constant B+.
      www.tubesandmore.com sells 630 volt Solens.
      http://www.partsconnexion.com/ is where I got the 400 volt Solens. Also hand matched Holco and PRP brand resistors from here.
      The board is populated with Sprague 716P film and foil polypropylene caps from www.tubesandmore.com  These were also hand matched from a large quantity.
      The phono eq caps are from Tanner's. Hand matched.
      The white wire in this build is from stripped apart Audioquest long grain copper cable.
      I've built several of these. In two others I used Chimera Labs sourced CCC wire and RCA's.
      The transformer is on rubber feet. Sourced from Tanner's. Most tweaks I've learned from John Camille, Dennis Boyle and Walter Delesandri. Slight change in phono eq from Walter.
       
      jim...
    • James Dolan
      looks very cool, jim. i even understood a fairly large percentage of it, too!! ... From: Jim To: dallasaudioclub@yahoogroups.com Sent:
      Message 2 of 4 , Oct 10, 2007
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        looks very cool, jim.  i even understood a fairly large percentage of it, too!!

        ----- Original Message ----
        From: Jim <jim@...>
        To: dallasaudioclub@yahoogroups.com
        Sent: Wednesday, October 10, 2007 10:17:05 AM
        Subject: [dallasaudioclub] (re)building an inexpensive tube phono stage

        Building a great sounding, (relatively) inexpensive tube phono stage
         
                       Home page photo and in our Photos section under "Dyna PAS Phono only"
        The first leg (of the PS) has two 47 uf at 250 volt in series with resistors across them to equalize the voltage drop over each cap. Making it about 24 uf at 500 volt.  Well above Dyna's B+ for each leg.
        The second leg is 33 uf at 630 volt. Making it 33 uf at 630 volt
        The last leg is two 20 uf at 400 volt in parallel. Making it 40 uf at 400 volt.  Voltage on this leg of the circuit  is below 250 volts even at turn on. 
        This is similar to the original capacitance rating. But notice each  leg consecutive has a higher capacitance rating in uf than the former. This gleaned from an article, with measurements. I read that if you make each leg larger than the last, you have a smoother, more constant B+.
        www.tubesandmore. com sells 630 volt Solens.
        http://www.partscon nexion.com/ is where I got the 400 volt Solens. Also hand matched Holco and PRP brand resistors from here.
        The board is populated with Sprague 716P film and foil polypropylene caps from www.tubesandmore. com  These were also hand matched from a large quantity.
        The phono eq caps are from Tanner's. Hand matched.
        The white wire in this build is from stripped apart Audioquest long grain copper cable.
        I've built several of these. In two others I used Chimera Labs sourced CCC wire and RCA's.
        The transformer is on rubber feet. Sourced from Tanner's. Most tweaks I've learned from John Camille, Dennis Boyle and Walter Delesandri. Slight change in phono eq from Walter.
         
        jim...

      • pdtt Houston
        Is it for sale? Sorry I could not meet you for lunch. I had to go back the next day on emergency. Paul Jim wrote: Building a great
        Message 3 of 4 , Oct 11, 2007
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          Is it for sale?
          Sorry I could not meet you for lunch.  I had to go back the next day on emergency.
          Paul

          Jim <jim@...> wrote:
          Building a great sounding, (relatively) inexpensive tube phono stage
           
                         Home page photo and in our Photos section under "Dyna PAS Phono only"
          The first leg (of the PS) has two 47 uf at 250 volt in series with resistors across them to equalize the voltage drop over each cap. Making it about 24 uf at 500 volt.  Well above Dyna's B+ for each leg.
          The second leg is 33 uf at 630 volt. Making it 33 uf at 630 volt
          The last leg is two 20 uf at 400 volt in parallel. Making it 40 uf at 400 volt.  Voltage on this leg of the circuit  is below 250 volts even at turn on. 
          This is similar to the original capacitance rating. But notice each  leg consecutive has a higher capacitance rating in uf than the former. This gleaned from an article, with measurements. I read that if you make each leg larger than the last, you have a smoother, more constant B+.
          www.tubesandmore. com sells 630 volt Solens.
          http://www.partscon nexion.com/ is where I got the 400 volt Solens. Also hand matched Holco and PRP brand resistors from here.
          The board is populated with Sprague 716P film and foil polypropylene caps from www.tubesandmore. com  These were also hand matched from a large quantity.
          The phono eq caps are from Tanner's. Hand matched.
          The white wire in this build is from stripped apart Audioquest long grain copper cable.
          I've built several of these. In two others I used Chimera Labs sourced CCC wire and RCA's.
          The transformer is on rubber feet. Sourced from Tanner's. Most tweaks I've learned from John Camille, Dennis Boyle and Walter Delesandri. Slight change in phono eq from Walter.
           
          jim...


          Yahoo! oneSearch: Finally, mobile search that gives answers, not web links.

        • Jim
          Hi Paul, It can be for sale if I build two more! I need one each for my two systems. Only have this one at this time. jim... ... day on emergency. ... tube
          Message 4 of 4 , Oct 11, 2007
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            Hi Paul,
            It can be for sale if I build two more! I need one each for my two
            systems. Only have this one at this time. jim...

            --- In dallasaudioclub@yahoogroups.com, pdtt Houston <pdtt75@...>
            wrote:
            >
            > Is it for sale?
            > Sorry I could not meet you for lunch. I had to go back the next
            day on emergency.
            > Paul
            >
            > Jim <jim@...> wrote:
            > Building a great sounding, (relatively) inexpensive
            tube phono stage
            >
            > Home page photo and in our Photos section
            under "Dyna PAS Phono only"
            > The first leg (of the PS) has two 47 uf at 250 volt in series
            with resistors across them to equalize the voltage drop over each
            cap. Making it about 24 uf at 500 volt. Well above Dyna's B+ for
            each leg.
            > The second leg is 33 uf at 630 volt. Making it 33 uf at 630 volt
            > The last leg is two 20 uf at 400 volt in parallel. Making it 40
            uf at 400 volt. Voltage on this leg of the circuit is below 250
            volts even at turn on.
            > This is similar to the original capacitance rating. But notice
            each leg consecutive has a higher capacitance rating in uf than the
            former. This gleaned from an article, with measurements. I read that
            if you make each leg larger than the last, you have a smoother, more
            constant B+.
            > www.tubesandmore.com sells 630 volt Solens.
            > http://www.partsconnexion.com/ is where I got the 400 volt
            Solens. Also hand matched Holco and PRP brand resistors from here.
            > The board is populated with Sprague 716P film and foil
            polypropylene caps from www.tubesandmore.com These were also hand
            matched from a large quantity.
            > The phono eq caps are from Tanner's. Hand matched.
            > The white wire in this build is from stripped apart Audioquest
            long grain copper cable.
            > I've built several of these. In two others I used Chimera Labs
            sourced CCC wire and RCA's.
            > The transformer is on rubber feet. Sourced from Tanner's. Most
            tweaks I've learned from John Camille, Dennis Boyle and Walter
            Delesandri. Slight change in phono eq from Walter.
            >
            >
            > jim...
            >
            >
            >
            >
            >
            > ---------------------------------
            > Yahoo! oneSearch: Finally, mobile search that gives answers, not
            web links.
            >
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