Ruby Tubes EL34BSTR Vacuum Tube Pair Matched

EL34BSTR Pair - Sensational new high-gain EL with dynamic tone. Extra-strong bottle, gold-plated grid.
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List Price$60.90
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Part # 072-942

Product Details

Ruby Tubes EL34BSTR Vacuum Tube Pair Matched
EL34BSTR Pair- Sensational new high-gain EL with dynamic tone. Extra-strong bottle, gold-plated grid. All Ruby Tubes premium power tubes are carefully tested and matched. Matching is done by both plate current and transconductance. Each tube is marked with the plate current and transconductance for that tube and a matched pair or quartet will have tubes that have the same tested value. Ruby Tubes come with a 6-month manufacturer's warranty, one of the best in the industry. They are so careful about selecting and testing their tubes that they have no problem making this kind of an offer. If one of the premium Ruby Tubes fails during the 6-month warranty period, they will replace it at no charge.

  • Tube TypePower Tubes
  • MatchingMatched Pair
Ruby Tubes EL34BSTR Vacuum Tube Pair Matched
  • BrandRuby Tubes
  • Part Number072-942
  • UPC844632005473
  • Product CategoryVacuum Tubes
  • Unit of MeasureEA
  • Product Rating
    (4 Reviews)
  • Weight0.306 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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Ruby Tubes EL34BSTR Vacuum Tube Pair Matched
Ruby Tubes EL34BSTR Vacuum Tube Pair Matched is rated 5.0 out of 5 by 4.
Rated 5 out of 5 by from Great price on carefully shipped amp tubesAfter shopping online for replacement tubes for my guitar amp, I decided to skip the boutique amplifier dealers and give Parts Express a try. I'm glad I did! The tubes were very carefully packaged for shipping, they arrived faster than I was expecting, and I got them at a great price.
Date published: 2014-06-13
Rated 5 out of 5 by from They sound great right out of the boxI am using these in an old Dynaco st70, I replaced a set of jj tubes. These sound great out of the box, I have used them about 20 hours now, still sound about the same as new. The price was reasonable, good bass mids and high's are great
Date published: 2014-04-07
Rated 5 out of 5 by from A great sounding EL34!I have used this type of tube before in other guitar amplifiers and have been nothing but pleased. It has thicker low end than your typical EL34, but when pushed blooms into what you would expect from an EL34. It is by far one of my favorite current production EL34 tubes, and has been very reliable in all the situations I have used them.As far as purchasing from Parts Express, it was nothing but a pleasure. I received my tubes VERY quickly and they were matched very well! Their price on these tubes beat out other tube retailers that I have used in the past as well. I wouldn't hesitate to order more tubes from Parts Express.
Date published: 2012-03-18
Rated 5 out of 5 by from Delivers Performance as Promised!This matched pair is performing flawlessly. The internet reviews about the Ruby EL34B-STR's being a great tube are accurate. I'm extremely satisfied with Part Expess & the tubes.
Date published: 2009-03-30
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Product Q&A

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Ruby Tubes EL34BSTR Vacuum Tube Pair Matched

PC and TC numbers

What are these numbers. I have a Vox I need to retube. Do I need to match PC and TC numbers?
Asked by: Cleophus
I'm not sure what you're referring to as a "PC" and "TC" numbers.The tolerances of these amplifiers is quite wide, any EL34, 6CA7 (iirc), or KT77 tube will work in the amp, at least for a while. Several other types might also work.
Answered by: AlonzoTG
Date published: 2011-11-01
  • 2015-08-04T10:04CST
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