yes the Shuguang factory was closed. Has been for over a year and a half. Any Shuguang tubes up for sale now are either left overs, or old stock that some had around. They are not fresh valves.
There was a building next door to the factory that caught fire. The fire was put out, but there was some minor damage to the Shuguang factory building, but not to the tube mfg. gear. Do not know all the details, but local govt in that city would not let Shuguang re-open so they decided to move to a larger facility, which they were planning on doing anyway. Have not heard how that is going. There are over 15 tube factories in China. Most are left overs from supporting the Chinese military. A few make some really good tubes. A lot make high failure rate tubes.
There are two popular competitors in China to Shuguang tubes. PSVANE (now have their own factory but used to be made in Shuguang tube factory), and Lanai (new tube company started by some PSVANE ex-PSVANE folks who left PSVANE to go out on their own.
Having said all above, will add the Shuguang WE KT88 red base tubes are the most organic KT88s I have ever listened to. If you like open full, midrange, with airy top end that has no edge to it, they really pull you in. But they are not worth buying if your plate voltage on your amp runs over 400VDC. (Keep in mind the original GE 6550 was spec'ed with a max plate voltage of 600 volts with normal operating voltage of 500-550VDC. and the original British Gold Lion KT88 was spec'ed at a similar voltage). All the Chinese tubes (speaking of a ton of KT88s) I have tried from Shuguang and PSVANE will not hold up long to higher plate voltages. You will experience tube ELFs ( Early Life Failures). I bought 3 quartets of the Shugang WE KT88 Plus red bass, and had a 30% failure rate before I reached the 6 month old point. Similar with the PSVANE Gray glass KT88s, they do sound good, but will not hold up to 500 volts on the plate. (take a look at all the Chinese made KT88 amps- most only put out 35-40 watts from a pair in push pull- WHY??? because they run 350 to 380VDC on the plate, that is why).
Have not tried any of the Chinese 211s, 845s, 300Bs etc, so can't comment on those. But will add the Chinese tube factories and re-sellers are charging a premium for all of these "special" tubes with their secret sauce mixed in. ....so just be careful before you fall victim to the "Audiophiles Siren's call" (or is the audiophool??) of Chinese made valve with gold plated pins, special black carbon plates and super secret gold mesh grids, and plop down your hard earned cash on Chinese made valves that may go up in smoke much quicker than you had expected. I was an audiophool who dropped 3-4 large on Chinese KT88s, only to be super disappointed in their longevity. They were great while they lasted, but once they started going, Poof, Poof, Poof, one after another, I felt like I had been royally ripped off.
Am now back buying Russian made KT88s.
If I can deviate from power valves for a moment to input valves, will say I have tried a ton of the Chinese made input (signal level valves) from China tube factories. Have tried everyone that PSVANE and Shuguang have made.
Have to say the new PSVANE 12AU7 Art series are among the best I have heard including many NOS varieties which I also have. Have not had them long enough though to see how long they will last. But dropping 72 bucks on a matched pair and having them go poof is a bit easier to swallow than dropped 2K on power tubes and having them go super nova on you...