2019 300B tubes that are worth the money?

I have use all listed here. 

Consider the various 300b offered by Kron.  They hit the sweet spot regarding price and value.  Most last to the 200 hr mark and then last years.  Those that fail, and 20% do, are replaced under warranty.   

Sometimes manufacturers will welcome a bulk buy.  No fancy box and paperwork, just a supply of tubes.

Regarding the new WE tubes.  My sense is there is opportunity to find them for less than retail.  Support your local or regional dealer.  WE are warrantied for 5 years!

My Emission labs lasted 10 before I sold the amps and they are still going strong!

Some owners of very early EML XLS are reporting their tubes are approaching 40,000 hours and still  test/measure  very well.  that's  a remarkable  accomplishment by any standard. Further more they have truly excellent sound quality.  Expensive yet they are a very high value product.
Charles 

So I ended up buying a used pair of KR 300B's.  The price was right ($500) and I'm very happy with the sound.  Hopefully they will last, but so far, so good.  I was a little surprised at first as overall I would describe them as more laid back, quieter, and mellower than the TJ's I had, but there is also more and tighter low end.  SET amps plus Klipsch speakers can be overly bright and the Czech glass brought balance to my system.  (also, my great grandfather was a Czech glass blower, and though I never new him, I think that heritage weighed on my decision!) 

IMO you can not go wrong with either the EML or KR 300bs. I used a loaned pair of the KR 300b XLS in my amplifier and they were exceptionally good sounding. Both brands  are upper tier quality Czech tubes. If  the KR has similar longevity as the EML then they'll serve beautifully for many years. 
Charles 

Some 300b have a pin sticking out the side of the base. Does it have a purpose? Or could I clip it?

thanks

gary