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Ruby

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A premium tube that produces more power, more tone, and higher fidelity with an extended dynamic range. All Ruby output tubes are labeled on the base with the exact matching measurements for plate current and transconductance. By matching these parameters, optimal performance and long life are ensured. Comes with a 6-month replacement warranty.
Ruby EL84CZ Premium Matched Duet

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  • Labeled with matching measurements for plate current and transconductance
  • Optimal performance and long life
  • 6-month replacement warranty

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4.89

9 Reviews

100%

of respondents would recommend this to a friend

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Reviewed by 9 customers

  • Outstanding Matched power tubes for Dr Z amp

    5

    Verified BuyerVerified Buyer

    submitted7 years ago

    byAnthony

    fromundisclosed

    Perfect replacement power tubes for my Dr Z amp. Matched quad for consistent performance. Highly recommended.

  • Ruby Tube Matching Service for JJ Tubes EL84CZ

    5

    Verified BuyerVerified Buyer

    submitted8 years ago

    byDon

    fromundisclosed

    I have used Ruby products for several years now. These Ruby EL84CZ are a JJ branded tube in a Ruby box. Ruby has a 6 month warranty policy. Most tube companies do not. Ruby does not manufacture tubes they only test the tubes much like Groove Tubes. I have found no sonic difference between "real" JJ tubes and the Ruby tested JJ tubes. I have only had one bad tube. It was a 6L6 from a matched quad. The whole quad was replaced no problem. I find Ruby to provide durable predictable quality tubes. I am a fan of rolling tubes to get the best sonic qualities out of an amp. I have no "Brand" loyalty. Many times the Ruby tubes are priced less than the same JJ tube. Providing testing and a 6 month warranty and lower price is a win win win.

  • Sound great so far!

    5

    Verified BuyerVerified Buyer

    submitted9 years ago

    byfzeppelin

    fromDallas, TX

    Just got them last week and gigged with them over the weekend. They sound great so far. No big deal but something of note, the tubes have the "JJ" logos stenciled on them and the Ruby name is basically stuck on over the "JJ" logo. I am using them in a Mesa Boogie Nomad 45 4x10

  • Sound great so far

    5

    Verified BuyerVerified Buyer

    submitted9 years ago

    byDanny

    fromundisclosed

    Just got them last week and gigged with them over the weekend. They sound great so far. No big deal but something of note, the tubes have the "JJ" logos stenciled on them and the Ruby name is basically stuck on over the "JJ" logo. I am using them in a Mesa Boogie Noman 45 4x10

  • Much better than stock tubes

    4

    submitted13 years ago

    byAvery Buffington

    fromAustin, TX

    Much better sound than the stock PM tubes that were in my Orange AD30. Thicker bass, less harsh and more smooth sounding on the od channel.

  • Outstandanding tone

    5

    submitted14 years ago

    byJames Gallion

    fromArlington, VA

    These replaced some ancient EL-84s in my Mesa Boogie Studio .22 Cal amplifier. We have mainly played an American Standard Strat and Les Paul through the amp with the new tubes using both a Dunlop Crybaby and Marshall Bluesbreaker pedal. The tone is outstanding whether clean or overdriven. I like it more than the original sound with the Mesa Boogie tubes. The tubes were easy to install. The pins were all straight right out of the box. They really shine when you push them hard.

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