6550 / KT88 / KT90

KT88's generate a lot power, handling significantly more plate voltage than other power tubes. As a result, KT88's and 6550's are produce cleaner tones and have low distortion, making it popular amongst bass amplifiers and high end audio applications.

  • Electro Harmonix KT88

    Great tonal character for the price. In stock.
  • Gift Card 2018

    Gift Card 2018

    From: $25.00

    To: $100.00

    Doug's Tubes Gift Card 2018
  • Gold Lion KT88

    Smooth tone, and great broad frequency range definition.
  • JJ KT88

    JJ KT88
    Detailed character, tightly compressed bottom end.
  • Penta KT88SC

    More refined, detailed. Good for hi-fi and guitar alike. ****OUT OF STOCK**** Please order RUBY KT88V-STR's.
  • Ruby 6550A-STR

    Ruby 6550 STR

    Ruby 6550A-STR is a Chinese Shuguang(Sino equivalent) - selected by RUBY.

  • Ruby KT88-STR

    Ruby KT88 STR

    Select 3-hole plate KT88 made by Shuguang in China. Also re-marketed as Valve Art.

  • Ruby KT88V-STR

    Ruby KT88V-STR
    Ruby KT88V-STR. Solid plate, triple getter.
  • Ruby Winged =C= 6550

    Ruby Winged =C= 6550
    The same tube as the SED Winged "C" 6550. 1 available

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