My understanding regarding the Shuguang 845s is that they make them in factory runs and then move on to another tube in the big tube family. Curiously the Psvanes were thought by many on certain other forums to be Shuguang products. I am sorry I can't comment on the sound quality but barring the KR etc. tubes you have little choice. I did see some very real looking NOS RCA 845s recently for $3 or 4K, but you can buy some decent amps for that and I thimk it was a running auction!
Shuguang 845B or Psvane 845 Hi-Fi series tubes
My amp is Mastersound 845. I've been using a pair of Shuguang 845B tubes. After 2 years (probably about 2000 hrs) one of them died. I don't see many Shuguang 845B on Ebay any more, they were quite good. There are some "new" constructions though ... Psvane 845 Hi-Fi series , about the same price as Shuguang 845B (note, these are not Psvane 845-T). How are the "new" Psvane 845 Hi-Fi in comparison to 845B?
Thanks
Thanks