Elrog 300B vs Takatsuki 300B tubes

Unfortunately, the prudent thing is probably to wait until the dust settles and Elrog solves the problem. I am rather impressed that Elrog produced a pair to match Charles' amp. Charles, did Elrog make a pair to your specs? Or did they cull their supply to identify the right pair. As I understand it, there is a certain variability in actual specs for all tubes - a typical bell-shaped curve.

Hi Gary,
I'm not sure of what method of selection they utilized(existing tubes or new batch). My suspicion is new specific batch. I was assured my replacement Elrogs were specifically matched to the Frankenstein MK II operating parameters ( my original pair weren't matched in this manner).
Charles,

Tmm, Thanks. As I stated earler, once the tube failed I replaced it with one of my stand by Psvanes, and the amp appeared to function normally.

Gsm, I am patiently waiting for a response from Matthais or another representative from Elrog in this forum.

When I originally ordered the tubes, I told the vendor the tubes were to be used in a Coincident Frankenstein application, and when Charles' tube failed, I alerted both my dealer and Matthais of my concern, so I did everything possible on my part. As I feared (see my post of 7/7/15 above), the tube failed at 2 days post warranty.

I've been following this thread with great interest since springtime. I bought my first 300b amplifier last fall, a Cary 300sei. I am getting ready to swap out the output tubes. I had intended to buy the Takatsuki, before I began reading about the Elrogs. But I see from the discussion that there is some question about whether the Elrogs are the right match for the Cary. (And if I am interpreting the technical discussion correctly, perhaps there is some question about the Takats also?)

Any Cary owners using these tubes? I would love to hear your thoughts.

Rfprice,
I can say that as of now if you order Elrogs from tubesusa.com(George Lenz) he'll ask about your specific amplifier in order to match operational parameters. Other vendors may now be following these same guidelines as well.