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I returned to DIY electronics in 2009 after a 20 year pause by building a few kits to get in shape. This blog is for me to keep track of my progress.
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Elekit TU-879S

Posted 12th August 2010 at 07:24 PM by alexcp
Updated 11th April 2016 at 07:59 PM by alexcp

Elekit TU-879S is the best sounding kit I have ever built. Thank you TubeDepot.com for selling these kits. With my DIY full range speakers I mentioned a couple of posts earlier, the sound is fantastic.

Update: one of the original 6L6 tubes got blue sparks inside. As this amp can use KT88, KT66, or EL34 without any adjustment or modification, I replaced both 6L6s with EL34s left from the K4040 project, but the sound deteriorated. A replacement 6L6 from TubeDepot.com restored everything.
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Posted in Tube power amps
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Total Comments 2


  1. Old Comment
    Alexcp...Appreciate your comments. Do you still feel the same about the Elekit TU879S? Ive looked at tube amp kits from $200 to $2000 and although have built ss kits in the past am a novice when it comes to tubes. Just looking for a place to get started for a reasonable price and still end up with a decent amp.

    I would appreciate any and all comments, and recommendations should anyone choose to share.

    Posted 5th June 2012 at 05:48 PM by andya andya is offline
  2. Old Comment
    alexcp's Avatar
    Yes, I still like the TU879S very much.

    Note that a lot will depend on the speakers. My amp works great with Fostex FE206En in DIY full range back loaded horns (BK-20 cabinets from Madisound). These speakers perform well when paired with a low power single ended amp. I do not know if the same magic will work with multi-way speaker or a less sensitive pair.
    Posted 2nd August 2012 at 11:18 AM by alexcp alexcp is offline

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