Ruby 12AX7AC5 HG+


Availability: In stock

Quick Overview

Sweet, warm tone. Highest grade, lowest noise.

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Ruby 12AX7 AC5 High Grade +

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  • Ruby 12AX7 AC5 High Grade +


The Ruby 12AX7AC5 High Grade tube is the Shuguang 12AX7 9th gen tube, but distributed by Magic Parts. These are a very consistently made tube, sweet sounding, and very warm. "High grade +" is one of the labels in the measuring system used by Magic Parts. It basically means the tube is best suited for the most sensitive first gain V1 spots.

Customer Reviews

Great for moving coil phono stage, sweet and tight Review by Michael
These tubes have replaced my prior favorites, the reissue Mullards. The Mullards had been the only tube that didn't sound a little hard in my Herron VTPH2 phono stage, amplifying a Lyra Delos cartridge. These Rubys are very smooth and sweet, per Doung's description, but what really stood out was their bass response. Tighter and deeper, ' nuff said. Listening to LP's is truly an enveloping experience, which is all I could ask for. Thanks. (Posted on 12/9/13)
Marshall VS100 Review by Al
I'm very happy with the Ruby 12AX7AC5 HG+! While the JJ 5751 may be a bit cleaner, it is a bit thinner also. The Ruby sounds great! Thanks for a great suggestion and great service! (Posted on 1/8/13)
Three RUBY 12AX7AC5 HG+ preamp tubes: Missing link for a GK Fusion 550 Bass Amp through a GK 4x12 Bass Cabinet Review by
Per Doug's recommendation we replaced the three stock JJ ECC83C tubes; these stock tubes where quiet and clean but lacked midrange color and touch sensitive gain. I ordered two pairs (4 tubes) of Matched Gain (+$2.00), Balanced Triodes (+$2.00), High Gain (+$2.00), Matched Pair (+$22.00, Two Tubes). The tubes where marked by Doug with a 110/110 on all 4 tubes. We replaced the three stock tubes and after a 10 minute warmup, my first check was to turn all knobs on 10; the amp had so much more gain that I had to "lower" the preamp control to 0.5 (yes less than one). I use the "active" preamp selection with all of my basses otherwise this amp distorts too easily and sounds more like a Marshall guitar amp then a traditional bass amp. Note this amp has a large dynamic headroom (60v p-p) using a three tube preamp and a high current solid state 500 watt power amp. With three RUBY 12AX7AC5 HG+ preamp tubes, the amp is much tighter bass response, yet I can push it to growl like my old Boogie DL180 (all tube bass amp) by playing more aggressively. Overall the most notable improvement was in the lower and mid spectrum of the tone controls (GK uses tubes for this and only has 5-6 db of boost). These tubes add that color to your sound with increased harmonics and boost. Overall the RUBY 12AX7AC5 HG+ preamp tubes provide that early USA touch sensitive gain with a warm harmonic sustain; a wonderful change in tone! (Posted on 6/16/12)
Great V1 Tube for a Mesa Boogie Walkabout Scout Review by Thomas
On Doug's recommendation I put one of these in V1 and was really impressed! As per the description, it's sweeter sounding and warmer than the stock tube. Also, it stays clean a bit longer but overdrives really well. (Posted on 5/18/12)

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