Have you contacted KR? (email@example.com) or (705-737-6773)
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Rodman99999 (you a surveyor?) "I've sent an email to KR's U.S. distributor" who actually answered pretty quickly to ask me to call them (but then my cellar flooded so I've not yet had a chance).
Brf- Hmmm. that makes sense. I thought that they also looked v similar in some ways to a pair of AVVT 300bs I also have. Do you know if the AVVTs also standard WE 300b specs?
Yes, the AVVT 300B is a WE 300B equivalent. I own a pair of the AVVT 300B with the SL-C37 glass, best 300B IMHO. AVVT also made the AV32B which is a high output 300B similar to both KR and the EML 300B XLS.
My understanding is that you can use the higher output AV32B or an 300B XLS tube in a WE300B spec'd amplifier as these tubes can perform at the WE spec'd (filament voltage 5v, filament current 1.3a, plate current 300v, bias 60Ma) and can go up to 500v on the plate with a bias 120Ma without any issues. If your amp is auto biased, you may not get the benefit of the higher output potential of the XLS tubes, but they will work and sound just fine.
Please note that the contact info for KR tubes that Rodman99999 has posted in not an authorized dealer or a representative for KR tubes. Please see kraudio.com under disclaimer for details. The US representative is another Alfred; Alfred Kainz of http://www.highend-electronics.com tel: +1 760 490 2410.