Best 845 tube out there?

Szyckf and Amfibius, as far as I know there are no commercial 845 amplifiers that use a regulated filament supply. Not Cary, not Audio Note, nor ASL. The schematics can be found on the web.

Most DHT amps use a diode bridge > capacitor > resistor > capacitor DC supply, for two reasons:
-it costs less than a regulated supply;
-it sounds better.
AC supplies are not an option, too much hum.

Also, a regulated 10V 3.25A power supply is actually a 35-50 Watts solid state amplifier. Do we REALLY want power transistors (IC or discrete, does not matter) feeding a DHT filament, which is also the tube's signal cathode? I bet that amplifier would sound like the worst of two worlds.

So, maybe KR is feeding you marketing BS to justify a weird product?

A tube with a different heater voltage or current SHOULD get a different number. For example, there are 6SN7s and 12SN7s, self-explanatory (6 volts and 12 V heaters).
This very simple tube industry rule-of-thumb has kept users out of trouble for the last 70 years.

I wish KR and Sophia did not play those marketing games on unwary buyers.
My advice to you: do not import many of those tubes. You are bound to lose money and/or valuable customers.

I own 845 SET amplifiers and have used successfully with zero failures: Shuguang 845A, 845B, 845M and RCA 845.

I wish you good luck with your distribution deal.

To add to my "mini review" ...as in a few posts previous to this...the Kr845 has a significantly lower noise floor then the 845m or the 845b. It is extremely quiet. It sounds like a hybrid between a 300b and an 845 if you can imagine that, combining a sense of "lushness" and sound staging like that of a 300b but with the linearity of a 845. I have no reasons to want to go back to listening with a 845b or a 845m. If i am going to be serious about my music playback i have to utilize a KR845 in my system and build the system, ie cords , around it. With this tube there is no fooling around. To balance this positive review i know of a few people who do not like it. They say it is coolish. I have an inkling as to what they might be referring too but it has within its sonic envelope attributes that can't be found in the other 845 tubes that i mention and therefore deserves to be accommodated into a system via system matching. I need to make it work because its got something! My 845m and 845b are up for sale as i write this.

Ampfibius.
Could you tell me what is the value of the bias capacitor in yours Cary 211? Thanks

Havent heard it, but Hightech Production Made in Germany is worth to mention:

ELROG ER 845

german review from stereoplay magazine:

http://www.stereoplay.de/ratgeber/made-in-germany-elrog-er-845-1158090.html

I bought my Belcanto seti 40 with 3 pairs of Shuguang 845's- regular aluminum base graphite electrode, type B's, and a pair of metal plates.
The aluminum ones were noisy within an hour or so of use, the B's were "OK", and the metal plates were ethereal! Unfortunately the metal plates didn't last forever, the actual metal electrode plates overheated, flared and came loose with time, they did last for 2 yrs though. I am currently using B's, but have ordered 2 pairs of metal plate 845's from "chinesetubes.com", I have read that if the metal plates test out ok for 30-40 hrs they are likely to last "the distance". Chinesetubes.com have a 60 day return policy so at just under $200 for a pair I'm willing to give them a try, until hopefully Shuguang change their policy and make more Noblemen type tubes. In short,if your amp can handle them, the best non NOS 845's are the metal plate Shuguangs.