The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all products

    SP14 'elite' Version


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    Join date : 2014-10-05

    SP14 'elite' Version Empty SP14 'elite' Version

    Post by mmmbeer on Mon Feb 04, 2019 7:36 pm

    Hi all

    I have an SP14 board (I believe it is REV E, over a year old) that I'm going to get started wiring into the case.  I noticed since there is now an 'elite' version using B+ film caps as an upgrade.   Is it possible to just install film caps where the electrolytics would be on mine?  Any other modifications that would need to be done?  I don't plan on pulling the board out ever in the future so I'd like to implement any upgrades now. The board is fully soldered but I can easily pull out the electrolytics.  I noticed on Don Sach's version he only has one film cap on one side of the board and othe is unstuffed?  I am very familiar with soldering and mechanical assembly, I am still learning electronic design though.  

    On another note, I can't wait to get some tubes in my system! I've got all solid state now, and I am very curious to see what this does (mostly bryston gear, b&w diamond speakers)

    Thank you


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    SP14 'elite' Version Empty Re: SP14 'elite' Version

    Post by corndog71 on Mon Feb 04, 2019 11:16 pm

    On my SP13 I replaced the B+ caps at the first gain stage with Clarity TC CAPS.  I started with one channel to compare and the film cap eliminated a slight haze to the sound.  

    SP14 'elite' Version 43659736431_612c41716a_c VTA SP13 tube preamplifier

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    Join date : 2008-11-30

    SP14 'elite' Version Empty Re: SP14 'elite' Version

    Post by tubes4hifi on Wed Feb 13, 2019 6:44 pm

    sorry, if you had emailed me directly you would have gotten an answer within a few hours, rather than a week or two, as I don't check this forum very often.
    You can replace the B+ caps with film caps. Just remember that you do not want more than about 33uF attached directly to the output of the rectifier tube (C11).
    The other B+ caps (C5) can be as big as you want. I sell a B+ film cap upgrade on my SP14 page.
    Dale Stevens

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    Age : 71
    Location : Loris, SC

    SP14 'elite' Version Empty Re: SP14 'elite' Version

    Post by Dale Stevens on Wed Feb 13, 2019 7:16 pm

    Welcome. What u really want to do is get Bob's VTA 120 power amp. You will be very elated > Dale

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