I have a single Shuguang Black Treasure CV181-Z, selling because I do not own gear that uses 6SN7's anymore. It was actually run tested in a preamp for noise, of which I heard none. I would guesstimate it has ~50-80 hours on it.
"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."
Asking $50. Buyer pays shipping and any PayPal fees. You can get a ballpark from 97006.
I'll accept a money order as well to save the PP fees.
Ships from 97006 Oregon, pickup is welcome in the metro-Portland area.
