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Vacuum Tubes

Here is where you find the finest vacuum tubes that are currently in production - from Shuguang and TJ Full Music, both are located in China. Grant Fidelity use these premium Chinese tubes in our own tube amplifiers and and distribute on behalf of the manufacturers in North America and even worldwide.

All tubes are factory premium matched, directly imported from manufacturer - no grey market / secondary quality products will come through Grant Fidelity's supply chain quality control. Please purchase with confidence.

How do we test tubes that we sell? 

There are 4 key quality control steps for every single tube sold from Grant Fidelity: 

            

                                  (testing tubes with the best tester)               (interpreting results)

 

The tube tester we use is called "Amplitrex AT-1000 Electron Tube Test System". It is probably the industry's most advanced computerized tube tester you could find in current production. 

For every single tube, Grant Fidelity test: 

  • Microphonic
  • Plate current
  • Transconductance
  • Gas test
  • Heater to Cathode leakage

For tubes with multiple sections such as 12AX7 and CV181 dual triode, we test all sections of the tube and match the sections as close as possible. Most tube sellers match tubes only to plate current, we take transconductance into consideration and match it as well. 

Your tubes are your workhorse in your system. If one section of a tube or one tube of a pair or quad deviate significantly from others, your system won't be balanced and work to its potential. 

Many audiophiles spend much on cabling to tweak sound, however, if your workhorse (tubes) wasn't taken care of first, a golden saddle (the cabling) won't make it a winner. 

If you are looking for a high valuel-to-dollar ratio purchase to boost your system, please do try out the Shuguang and TJ Full Music tubes from Grant Fidelity.  

All tube listing price is in USD and includes 30-day warranty from Grant Fidelity, plus an optional 12-month extended warranty at a small extra cost.

Shuguang Treasure ® Series
TJ Full Music
Shuguang generic tubes
 

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