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Elrog 300B vs Takatsuki 300B tubes

Has anyone heard the Elrog 300B tubes ? I read an article which mentioned that the Elrog 300B delivers 15% less power than a traditional 300B tubes. Can anyone confirm that it is audible ?

I am choosing between Elrog and Takatsuki 300B tubes. I would prefer the Elrog because it is cheaper and supposedly wonderful but if it really sounds less powerful then I have to rethink.
pani
mk_
16 posts
 
Hi Charles,

You are absolutely right...No problems for EML XLS tubes.
They are designed for 55W anode dissipation, not for 36(40)W only. For this tubes the "Frank" is easy. ;-)
You can read something about that here:
http://www.emissionlabs.com/datasheets/EML300B-XLS.htm

Yes, we work on modifying the tubes to improve the compatibility for some "special amps"...but this needs time.

For now we will replace failed tubes with selected tubes, tested at the same conditions as this amps are working(plus 10% safty margin)...

Regards, Matthias
jetrexpro
506 posts
 
Charles you may want to call Israel Blume. I find that this operating point would be hard to believe. It would fry any mesh plate tube and push any standard 300b to its limits:

"1kOhms cathode resistor we have 86.8V at the cathode at anode current of about 87mA."
charles1dad's avatar
charles1dad
10,250 posts
 
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,
jetrexpro
506 posts
 
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.
jetrexpro
506 posts
 
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.
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