"Hi-End, Not High Priced"

TJ Full Music

TJ Full Music was established in 1990s by one of the pioneers of Chinese vacuum tube industry. To date, the company is still run by the founder, Mr. Zhesheng Liu, who is in his 70s and his son is also actively involved in day-to-day business.

In the past decade, TJ Full Music 300B tubes has earned solid reputation in the international hi-fi market through OEM brands and has been reviewed by many major hi-fi magazines such as EnjoyTheMusic.com etc. The TJ Full Music 300B/SE tube is considered among the best 300B tubes in production today.

Since 2008, TJ Full Music has expanded to 2nd manufacturer facility in Tianjin City, China to manufacture high end gold pin, box plate 12AX7 and 12AU7 tubes. Audiophiles who have tried the 12AX7 and 12AU7 commented that they are even superior to the Telefunken ECC83 tube. In late 2008, TJ Full Music has released their 805/845/211 MKII series with oxide plate rather than graphite plate.

TJ Full Music has a solid resale network out of China with excellent support from factories. We are pleased to represent TJ Full Music tubes, one of China's or even probably the world's finest tubes, in North America.

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.