Shuguang Treasure CV181-Z
The Shuguang Treasure Series CV-181Z tube is a unique take on the 6SN7 tube. Unlike a NOS CV-181 tube, the Shuguang CV-181-Z tube is a safe replacement in any 6SN7 circuit. It is not identical to the NOS CV-181 tube. However compared to other 6SN7 tubes, the Shuguang Treasure CV-181-Z tube has a much larger "ST" style bottle. The beautiful ceramic base is over-sized as well, measuring 1 3/8" (35mm) in diameter.
Many folks report that the sound quality rivals that of the best vintage 6SN7 tubes. The CV-181Z tube's construction features a ceramic base, gold grid wires and pins, and a new internally coated black glass bottle. This unique HPCC coating is known as High Polymer Carbon Compound glass coating and is unique for its ability to reduce stray electron emission that can otherwise reflect off the glass. Shuguang also uses their new "Super Alloy" technology. Originally applied to aviation, aerospace, and military applications, this technology has been successfully used by Shuguang to accomplish directional solidification and single crystallization. This greatly improves the ability of electron emission and electron current stability.
This new Shuguang Treasure 6SN7 type required additional parts selection quality control processes, improved vacuum techniques and additional burn-in time and testing. This Shuguang Treasure 6SN7 type is their premium export grade and purchased direct from Shuguang in China.
Other Shuguang Treasure tubes6SN7 Tube Types
Additional Information and Downloads
Warranty Information and Return PolicyWarranty Period: 3 months
All our tubes are guaranteed for 3 months from the date of purchase. (Any exceptions will be noted on that tube's Warranty tab)
If you receive a tube that does not perform to the manufacturer's specifications, please do the following:
- contact us to get a return authorization
- return it via regular mail within 90 days from when we shipped it, and we will provide an exchange or refund of the full purchase price of the tube.
Returns not related to warranty or defect will be considered at our discretion, and are subject to a 15% restocking fee.
We can not accept returns that don't have an authorization, are past 3 month, or are returned improperly.
These guidelines may be updated without notice.
Ratings & Reviews
The ultimate 6SN7
by Denny L.
Tube rolling is an obsessive, compulsive madness that can drive you to the brink of insanity...or am I (you) already there?��I love the lush tonal qualities of 6SN7 preamps. My current favorite is the ModWright LS100. My growing stock of 6SN7's from other preamps didn't fair that well in the LS100. Of those my favorite is the 1951 Sylvania BadBoy, with black plates and 3 rivet holes. But the bass somehow disappears in the LS100.��Bass and dynamics with the stock EH tube and its gold pin variant are wonderful, but there's no air and space or any of that famous 6SN7 lushness of tone with these tubes in the LS100.��I was about to give up when I tried the Black Treasures. Though really pricey (damn!), these are far and away the best tubes I've heard in the LS100, including the Sophia Electric.��Like the EH tubes they play louder, are dynamic as hell, and have amazing bass impact and depth. But they also have that 6SN7 lushness, spaciousness and air in spades in the LS100. ��An amazing tube that you can listen to and get lost in the music for hours. This is what it's all about...at a price.