Elrog 300B vs Takatsuki 300B tubes

Charles,

Does your MKII incarnation of the Frankensteins have both an HT fuse and a second AC fuse?

It is my understanding that the HT fuse is intended to protect the Frankensteins in the event the 300B tube fails.

I am curious whether the HT fuse blew when your 300B tube failed?

Wondered if anyone can chime in on how the Elrog would be in a Cary 300SEI? I believe I have read somewhere that this integrated pushes a 300b a bit...or could I just adjust the bias down a little to try and compensate? thanks

Israel blume responded to an earlier email today. He says the plate voltage of the Frankenstein is 400 votes, he says the heat dissipation is measured at 28 watts. He said changing the cathode resistor from 1 to 1.2 k ohms is technically okay but in his opinion will result in sonic deterioration. He further said that in the past four years he has had virtually no failures using the Pavane and Shuguang 300b tube. He Points out how cool running the Frankenstein amplifier is, he attributes this to using over Spec capacitors transformers and resistors.

I really appreciate Israel's response today, I can agree with him on the cool running Frankenstein and the durability and longevity of using Shuguang as well as EML tubes. I've decided to leave the stock resistor in place, and just wait for the tweaked/modified version of the Elrocg tube and go from there.
Charles,

Hi Tmmvinyl,
My Frankenstein MK II was bought new in 2009, I believe this incarnation has only the HT fuse. No, the amplifier did not blow a fuse. I put in the EML XLS as replacements and everything is working and sounding fine.
Charles.

I did not expect to hear that the Franks are indeed running 400v on the plate. That puts them towards the upper range and not a conservative operating point. I would think that's the upper range of what the Elrogs can handle. No wonder the EML 300b XLS sound so good.

A more typical operating point for the Western Electric 300b is 350v on the plate @ 60mA according to the Tube Data Sheet