Favorite 300B: Sophia vs KR

Who sells the Shuguang Treasure Series? Is there a manufacturer website? And what about the Genelax Gold Lion PX300B?

Is Shuguang Treasure Grade B ok? Reading the description they sound defective. $395 from Grant Fidelity. $510 for Grade A.

My interest in this tube is growing as I'm not feeling Sophia at the moment (failed 274B) and would like to give another brand a try.

EAT is too expensive. KR WE Clone is available for just over $500, but I don't want to be disappointed if it fails and lose $$. And the EML 300B is $493. I'm not paying any more then that for these tubes. I'd rather pick up half used NOS WE.

I purchased the grade A versions from Grant Fidelity

The Grade B Shuguang tubes aren't defective. They're just a lower quality tube. Shuguang matches each pair, and the tolerance differences determine which tubes will be Grade A, B, etc. I also use the Shuguang Black Bottle 300B Treasure tubes, and have had no issues with them, and they sound very good. Very clean and clear, with pretty decent bass for a 300B.

I know Grant Fidelity has the Treasure tubes. I think others do, too. The only exclusivity Grant has with tube distribution, I believe, is with the Shuguang Psvane 845.

You can find them cheaper than 600/pr, but beware. You may not be getting Grade A. If you go with Shuguang, buy from a North American retailer. Shuguang routinely exports their best tubes, and keep the lesser quality ones in China/Asia. So, if you go looking on ebay or something like that, and find a pair for 200 bucks, don't think for a second that you're getting a great deal from the guy in Shanghai.

Sometimes Grant Fidelity has sales on the Treasure tubes, even type A.