CV181-Z (6SN7GT) ShuGuang Tube - Treasure series

Although this tube is modeled as CV181 by the Chinese manufacturer - Shuguang, please do refer to the tube data at bottom of this page to check compability with 6SN7 / 6N8P tubes. The treasure CV181-Z has heater current of 0.6A, not 0.9A as typical CV181 tube does.  A comparable RCA 6SN7-GTA tube date has been added at the bottom of page for your convenience to compare. 

" It succeeds in beating the best NOS samples at their own games with the added bonus of new stock reliability and dependability".... "I have spent many long hours burning-in and auditioning NOS 6SN7 (there's so many to choose from) and the Shuguang CV181Z beats them all with maybe 50 hours on them and they claim to need 300 hours"

Mark Wheeler - TNT-Audio

True "Treasure" as a result of Shuguang's 50-years' of expertise in vacuum tube design and production.

- High Polymer Compound Carbon (HPCC) coating is for the first time used on vacuum tube production. Compared to traditional carbon spray technology, HPCC coating will allow greater concentration of electrons, enhance and maintain stability of the electron flow, maximize "secondary electron emission surpression" from the glass enclosure, in turn reduce effects of electron swirl which generates internal noises from the vacuum tube itself.

- 'Super Alloy' technology is for the first time used in constructing vacuum tube. 'Super Alloy' technology was invented and first used in aviation, aerospace, military and other high-tech area. After 3 years of testing under extreme conditions, Shuguang has successfully adopt such technology in vacuum tube constructing to achieve directional solidification and single crystallization, greatly improving the ability of electron emission and electron current stability.

- Improved vacuuming technology during production process to clear signal background - Key assembling process is manually completed by a small number of senior technicians with 30+ years of experience.

- 60 extra parts selection and matching processes are adopted to ensure premium quality tubes, compared to the Shuguang generic clear glass tubes.

- Premium Grade matched right out of factory to serve outside of China market

- Interchangable with 6SN7 family of tubes 

- Suggested burn-in time 150-300 hours. Most changes happen in the first 150 hours.

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