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Ruby EL84CZ Premium Matched  Quartet

(Quartet)  Sku #212031000000186

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The most powerful EL84CZ available!

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.

  • Labeled with matching measurements for plate current and transconductance
  • Optimal performance and long life
  • 6-month replacement warranty
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by PowerReviews
RubyEL84CZ Premium Matched

(based on 2 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 2 customers

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Good tubes so far


from VA

About Me Professional Musician

Verified Buyer


  • Easy To Use
  • Functional
  • Good Quality
  • Improves Sound


  • Labeling confusing

Best Uses

  • Backup
  • Concerts
  • Practicing

Comments about Ruby EL84CZ Premium Matched:

Was thrown off when the Ruby tubes arrived and they were actually JJ tubes. Sent them back (easy exchange - well done Music123!) - and the same thing happened again!

Went to Ruby website and found out that Ruby is a DISTRIBUTOR, not a manufacturer. They, supposedly, modify the tube so it becomes a Ruby tube, which is stated on the sticker at the base of the tube. Thus, when you buy a Ruby tube, the actual tube may have JJ, Ruby, or another manufacturer's name on the actual tube. (I have a set of Ruby tubes that actually have Ruby ON THE TUBE, not just a sticker on the base of the tube.)

All that said, the tubes sound great! I used these to replace Groove Tubes in my Egnater amp. Makes a HUGE difference.

I will certainly use these tubes again in future when I need to get more.


Nice Upgrade.


from Undisclosed

Comments about Ruby EL84CZ Premium Matched:

I have a small tube amp that only uses one of these. After replacing the stock tube that had gone bad, I wish I had gone with one of these to start with. Now I can use the tone knob fully with and without my effects and not get any muddyness when there is more bass. I thought my speaker was not capable of good lows. I was wrong, It was all about the tubes. Nice and clear with the same sweet tube tone when I crank it up loud.

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