Elrog 300B vs Takatsuki 300B tubes

Wyan001:
Unfortunately you can't make adapter to add R to cathode bias: heater pins should be connected directly to 5v heater supply and virtual center of the heater goes via bias resistor to the ground (that's where additional R supposed to go). Also cathode resistor (in this case exiting one in series with the 200 ohm) is bypassed by capacitor.

I also got my replacement pair (Matthias, thank you very much) and they sounds like ... Elrogs!

Alexzzz, thanks. :)

With continued listening to my replacement Elrogs ER 300b I've come to realize they sound "better" than my original pair. I don't know if better matching of the tubes to my amplifier's operational points is the reason or not. The natural sound and music reproduction is the best I've heard in my home to this point. "If" the tube durability can match the sublime SQ, this is the best tube recommendation I can offer someone. This tube is really something special.
Charles,

Charles,
I received my replacements about a week ago and have listened to them sparingly while awaiting delivery of the PS-10 so I can limit the voltage going to the amps. That said, the replacement tubes most certainly sound better than the originals as they sounded prior to failure.
When I replaced the failed elrogs with my Psvane T black bottles, I was surprised to find that the Psvanes were almost indistinguishable from the Elrogs. This was in sharp contrast to my initial reaction to the Elrogs, which was that they were head and shoulders above the Psvanes. The inescapable conclusion is that the Elrogs really degraded with use prior to failure. Prior to failure, I knew something was wrong. The system had lost its magic, and I had no idea what was wrong.
Anyone else experience anything similar?
Apart from keeping the voltage down to 117, anyone got any more tips on the care and feeding of the Elrogs?