Ayon Triton III — KT88 BTSX Tubes? Tube sources?

Can anyone explain what is different/better with the KT88 BTSX tubes that came with the current generation Ayon Audio "Triton III" integrated amp?

...Are those the best tubes for this amp?

Also, I simply can not find an alternative source for the stock KT88 BTSX tubes, I'm sure I will pay the maximum by approaching the dealer, but so far thats my only option for the BTSX tubes.


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Shuguang Black Treasure KT88
I agree with thuhaile in the response above. The dealer for Ayon is going to try to push you into buying their "fancy" BTSX tubes, which are WAY more money than the standard, affordable Black Treasures. There is a trustworthy seller on E-Bay (Hanshare Electronics), who I have bought from several times and had excellent results with. Spend your money on some good NOS driver and input tubes for it instead! They will improve the sound more than the "fancy" KT88s.
Thanks... I have been looking for more recent information regarding new KT88s and current sources for purchasing. "Hanshare Electronics" has come up a few times as a reliable source, but I do not see any recent discussions around (for instance) Canada Fuller KT88s...

It might be time to list the various sources/brands/models of KT88s and reliable sources for tested/matched stock.
Update: I sourced 3 sets of matched quad KT88’s from Ebay "NewQuestInc", based in California (strategy: less shaking between CA and VA). They arrived very well packed (thank you if you see this in the next decade) but I have not yet yanked the Ayons and re-biased the amp.

The Ayon will auto-bias (see manual) the tubes in an initial non-operational post-warm-up mode if it is user-initiated, and also before shutting down but only after a minimum length of time running (I recall 45 minutes). The auto biasing is a separate circuit outside the signal path, and it maintains tube bias (state) information over time. It’s a remarkable amp, but the Ayon tubes have had a high-failure rate (2 out of 8 tubes) in slightly oner it’s first month. (I have excellent power and am running ALL gear behind PS PowerPlants.)

The Ayon Triton III has 4 KT88s per each channel. The untried new Gold Lion tubes (I have 3 sets of matched quads) have match numbers: 48, 51 and 57.

Question: If I install these new tubes, what seems to be a good strategy: Mix them up by bias and tube position within left/right circuits or group matched tubes in left and other matched in right?
Has anyone had experience they can report about the reliability of Black Treasure KT88s?  I tried some competing special Chinese-made KT88s which I liked a lot sound quality-wise, but I just had a couple of new tubes fail around the 90+ day mark, which was disappointing.  Also, my first set of those tubes lasted 18 months before I had to replace them.  
From my experiences, the reliability of the Black treasure tubes is hit or miss. I have since switched to Gold Lions KT88 for the Tritton 3. So far so good and they are also cheaper to replace as well.
I also ended up with a "daily-listening" reliable set of Gold Lion KT88s. The difference in cost between the more expensive Ayon and Gold Lion tubes is absurd for the gain.

I emailed Ayon to enquire if I could run KT150s in my Ayon Triton III, based on their lookup of my serial number my amp was built to allow that (you need to check if you are unsure). Now I am in the process of seeking a solid vendor of a matched octet of KT150s... 
Thank you for sharing your experience, thuhaile and vicweast.  Good to know.  I might buy a few BT KT88s for my stock and trial and and have them properly stress tested at TC Tubes who offer this service.