Quick update on the break-in, sound and reliability of the ELROG 300B's.
During the 80 hour break-in period, it was a bit of a roller coaster.
Sounded good right from the start, but the high end extension (grain) and base slam definitely improved with time.
As compared to Takatsuki, Psvane WE 1:1 and Gold Lion's, I find that the ELROG's present a "heavier yet delicate" overall presentation. About 30% more weight across the spectrum.
Like the other tubes mentioned, great sound staging and "air" around instruments and performers.
This tube really shines on vocals, string instruments and piano. When the hammer hits a string on the piano for example, you really know it.
After break-in, I made some "upstream" changes to my preamp and DAC tubes to see the effect. The ELROGS are quite unforgiving when they don't like what's coming from other components.
Complimentary upstream inputs need to be carefully selected.
Another way to say this, is "garbage in-garbage out." ELROG will let you know the good, bad and ugly system attributes.
So far I have enjoyed my time with these 300B's. They sound great in my system, and the reliability has not been an issue.
Hope this helps other listeners.