Elrog 300B vs Takatsuki 300B tubes

Jet,
I am a bit confused to some extent. Israel says the Frankenstein MK II is a "easy on the tube" design, heat dissipation is 25 watts and overspec transformers that operate at only 30% capacity. I can say that the amplifier is cool to the touch. The power transformer is only warm to touch when left on the entire day (never hot). I didn't have tube durability problems with my former Shuguang black treasures.i could have sworn at one time Israel said the Frankenstein ran relatively modest plate voltages(I could be mistaken). Bottom line, the amp sure sounds superb when good quality 300bs are used.

If the cathode resistor change settles the problem then this is very good
news. Matthias I'm assuming there's no adverse affect on the circuit (or other amplifier parameters) with this resistor change.
Charles,

Charles I agree there is some confusion going on. A call to Israel will solve this. I would guess the Franks Power supply is outputting more or less 425v. And if it is somewhere around 425v no adjustments to the Cathode resistor would be needed.

If the power supply is outputting somewhere around 425V that would mean the 300b tube would see a more conservative 325 to 350v acoss the plate depending on the cathode resistor value.

Charles I think Doug has the test equipment to measure these tube paramaters on his test bench. Its nice to have a Techy friend in the audio business.

Jeff,
It would be enlightening if he can measure plate voltage and other fundamental parameters.
Charles,