– from Robin Waytt, owner of Robyatt Audio (www.robyattaudio.com)

“The new Shuguang Treasure Series 300B-Z tubes arrived yesterday. These Black bottle carbon coated tubes are kind of unique in appearance, and construction, so I thought I would try them!

I put them in my Tektron switchable 2A3/300B/50 SET integrated, and ran them into the old Altec 604-C’s. I must state I have never been a 300B fan , I prefer 2A3’s or 45’s, however these new tubes could be one of the nicest tubes I have ever heard!!! Incredible detail, with no glare, the traditional 300B, “white” sound is gone, just sweet detail with amazing extension, and air around the instruments!!”

“I compared a loaner pair of engraved base 1930’s original Western Electric 300b’s, my re-issue Wester Electric 300b’s, and a new pair of Grant Fidelity imported Shuhuang Treasury Series carbon coated 300b’s. All played in the reference Tektron 300B intergrated using vintage Telefunken AC2 input tubes and NOS Panasonic 274A’s rectifiers.

Well first the bad news $3000 does buy you the best 300b ever, the original 300b’s have better detail better harmonics and amazing soundstage than the others. However the slight “white” nature of 300b’s is still present. Now the good newsthe Treasure 300b is AMAZING bettering the reissue 300b’s by a margin while completly banishing the “white” nature! Fantastic bass, burnished tones and richness in nature characterize this tube. The mid range and vocals are a pure grainless joy. My new SET tube of choice in the Tektron amplifiers-and I DONT LIKE 300b’s!!!!”

(feedback provided via email)