KT88 / KT90 / 6550 Tubes

(8 customer reviews)

$60.00$799.00 US

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8 reviews for KT88 / KT90 / 6550 Tubes

  1. William Zapata (verified owner)

    I have purchased multiple times from Jim. Bought a quad match Electro-Harmonics 5550EH as my first order. Top notch shopping experience at every step of the way. Great communication and service on top of his experience and knowledge. Valvesnmore is the shop I’ll continue to get my tubes from.

    Will Z.
    Florida

  2. Jesse Curran (verified owner)

    Purchased a matched quad of vintage Svetlana 6550’s to replace the stock R8 Power tubes. The result was a decrease in that crispy, crunchy, etched top end bite. Now my music just flows smoothly in a natural, non-fatiguing relaxed presentation. Soundstage improved…… The location of the instruments more pronounced. I would compare the difference to Fluorescent lighting compared to an incandescent light bulb lighting.
    I can’t stop listening…… Absolutely wonderful!
    Jim has been right on with his recommendations!

  3. Todd Crawford (verified owner)

    Jim has been a great resource for figuring out the best options for tube rolling my R8 amp. I recently added the Svetlana 6550 (SED Winged C (#550q) and was blown away the second I swapped them out. You really are missing out on the potential of the R8 if you’re not using vintage matched tubes. These 6550s are why I bought the R8 to begin with. All I can say is Wow, wow, wow!

  4. William Zapata (verified owner)

    I purchased a matched quad set of the SED Winged C, a marked improvement from the Electro-Harmonics 5550EH I purchased originally for my R8. I’m glad I decided to purchase the SED 6550 quads. I can’t reiterate enough that the purchasing experience from Jim at valvesnmore is always a pleasure.

    Will Z
    Florida

  5. Chris Harding (verified owner)

    I have just purchased a matched quad set of SED 6550Cs to replace the PsVane Grey KT88s on my Willsenton R8. I had already upgraded the 6SL7s with Sylvania GTs from Jim, and this was the next upgrade.

    All I can say is that the amp now has presence. By that I mean that everything in the music is tangible – as if I was at a live concert. The sharp edge and graininess of the Chinese tubes has gone, without sacrificing the clear top end. Bass is well controlled; but it is in the midrange and instrument separation where the 6550Cs excel.

    A worthwhile upgrade.

  6. colin (verified owner)

    Bought a quad of true vintage Svetlana KT88’s from Jim, shipping to UK was one week and they arrived in perfect condition. The difference in Sound Quality compared to my reissue Gold Lion KT88’s was a huge improvement. My Willsenton R8 is now fully kitted out with all vintage tubes from Jim and I couldn’t be happier. I even received a hand written note explaining/reminding me how to change from EL34 to KT88 on the R8 and how to bias the tubes correctly – outstanding customer service!!

  7. dellaris_1 (verified owner)

    I got my quad of Svetlana 6550c, all I can say is this tube has very serious detail, very well balanced, I love the midrange and to be honest I can’t stop listening to my music. I just threw my Chinese tubes in the garbage 🙂
    Also I upgraded the front line of my R8, with MELZ tubes, now my R8 can compete with much more expensive tube amplifiers, I’m not kidding guys! Thanks a lot to Jim who’s knowledge helped guide me to this purchase.
    Cheers 🥂

  8. TheGM (verified owner)

    The Quad of SED 6550C is a wonderful surprise.
    I have been listening to a truly superb quad of Mullard xf2 EL34, also from Valvesnmore. These 6550 are very different. They are clean, detailed and the midrange is tactile with a solidity to it.
    The tubes themselves look brand new with shiny chrome flashing.
    Plus these are a relative bargain compared to the Mullards.

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