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.



  • ANOS GE 6550

    NOS-6550-A
    $99.00
    ANOS GE 6550. Only unmatched singles available.
  • ANOS Genelex/GEC KT88

    ANOS Genelex/GEC KT88
    $299.95
    ANOS Genelex GEC Gold Lion KT88 originals, not the reissue.
  • ANOS Tung-Sol 6550

    ANOS Tung-Sol 6550
    $124.95
    ANOS Tung-Sol 6550 originals, not the reissue.
  • Electro Harmonix KT88

    Electro-Harmonix-KT88
    $36.95
    Great tonal character for the price. In stock.
  • Gift Card 2019

    Gift Card 2019

    From: $25.00

    To: $100.00

    Doug's Tubes Gift Card 2019
  • Gold Lion KT88

    gold-lion-kt88
    $59.95
    Smooth tone, and great broad frequency range definition.
  • JJ KT88

    JJ KT88
    $38.95
    Detailed character, tightly compressed bottom end.
  • Penta KT88SC

    penta-labs-kt88sc
    $57.95
    More refined, detailed. Good for hi-fi and guitar alike. ****OUT OF STOCK****
  • Ruby 6550A-STR

    Ruby 6550 STR
    $49.95

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

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