Favorite 300B: Sophia vs KR

I have used EML 45 (solid plate) and 2a3 and Shungang Black Treasure 300b with no reliability problems. Not sure how the EML 45/2a3 experience would translate into a 300b (especially a mesh plate 300b), however. I am very happy with the Black Treasure 300b from the standpoint of reliability and sound; in fact, these were the tubes recommended by my amplifier designer.

I forgot about Emission Labs. I recall good things. I'm skeptical of the Shunguag(?) and most others in the $100-$200 range. It's not much to spend but can quickly add up from disappointing trials. One prerequisite is the tube be made to WE 300B specs. Not all 300B's are direct replacements and each 300B amp design varies. This could be the cause of failure for some customers 300B's.

Sakahara,
You are apparently confusing the Shuguang lower cost/quaility 300b with the more expensive(600.00 USD) ultra quality Shuguang Treasure Series(black glass). I use the black glass 300b and it`s sound is superb, I have about 1700 hours of use with absolutely no reliability issues. As I stated in an earlier post 6 moons has done numerous reviews and comparisions between the premium chinese,high end european and the most recent WE 300b. It would be worth your time to read those in my opinion.

Cheap Chinees, such as TJ's or other's have problems to keep bias at the level, they just don't, so, if I were you, I would buy from trusty source and the high quality only. I have read a lot about 300B's and many of them just dont have the quality level, however they may sound pretty good, but like many already said, if they will be dead in a short time, why bother?
Go for EML's or KR's, but tubular, earlier production type. I own a pair and they are very good.

Very happy with the EML 300b solid plate. Would love to try their mesh.