Elrog 300B vs Takatsuki 300B tubes

You gotta love people who are dedicated to providing quality service. Tube matching to your particular amplifier! Awesome! Gotta love it. Well done, Matthias. Now I have to figure out how to get the operating parameters for my LadyDay+ amps.

Matthias, I too am waiting for George to send me a suitable pair for my Franks.
Thanks to you and George for sorting all this out. It's commendable of you two.

Best,
Joe

Joe,
My initial experience with George was three years ago when he sold me my pair of EML tubes. I was very impressed with his responsiveness and good attitude and I knew that customer service was very important to him. Well, he's done it again with his handling of the situation concerning the Elrog tube and various amplifiers, I give him a grade of A+!
Charles,

Although it may not be analogous and although I am not sure that I understand the principles involved, I had a similar experience with my Ancient Audio 300b SET. It was built with a protective circuit that proved rather touchy. As I learned through trial and error (and with the help of the folks at Sophia Electric and AmtransJapan, the distributor of Takatsuki), individual pairs of 300b tubes were less likely to trip the circuit if they had a low measured plate current. There is a range of specs for all tubes that fall within the high and low acceptable limits. The manufacturers helped to cull out pairs that were the most compatible with my amplifier.

This evening, from about 7:00 PM on my voltage has been fairly steady at 122.3.

The highest reading I observed all day was 123.3.