Elrog 300B vs Takatsuki 300B tubes

To my ears, the Elrogs are just outstanding in the Coincident Franks. They are much better in essentially every respect as compared to the Psvane Ts. Previously, I had found no preference in comparing the Ts to the TIIs, and found both of them superior to the Shuguangs. I have not had the pleasure of auditioning the EMLs or Taks.
My advice to other Frankenstein owners would be to give the Elrogs a try. I seriously doubt you will find anything better based on my experience and that of Charles. For owners of other amps, your mileage may vary. The good news is that we have some wonderful tubes to match to our amps and individual tastes.

Hi Charles1dad,
With my HUGE respect to you, this is not what I wrote.
I reported a case where with a particular SET amp Elrog was not just unsatisfactory. It was most probably not working properly as the sound was much inferior. It was not a matter of preference. The testers have huge experience both listening and building amps, I have not a slightest doubt in their assessment (there were 2 people, I have feedback from one).
In the second case I reported, it was indeed a matter of preference and not towards Elrog. And the man owns all these tubes, it's not a quick AB test. The SET in this case is also not Frankenstein MK2s. They system is very high grade, higher then mine and mine isn't a toy either.
The Elrog is not a drop in replacement for any 300B tube. What's called 300B tubes these days is a mix of different designs and even specs and this does cause problems in some amps. Several amp designers discuss or mention this. I could drop names of particular tubes here but I won't :)

Old WE's are not the same as new WE's and various batches may have different qualities too. I only heard new WE's, never the old ones but did several times, one pair is still with me.
What's very important is that Elrogs do work wonders in Frankensteins and this is key and very valuable info.
I am going to be more careful with other amps.

I am extremely grateful to you for making me replace 101D's in my Coincident Line Stage with PSvane WE Replica. I also replaced the fuse with AH. I totally confirm your findings there. I also paid attention to Star Sound and Tripoint type of products and am trying both with good results.

Dmarkov,
In terms of specs (filament current and voltage) the Elrog is a drop in replacement. In terms of "sonically" matching, this will be an individual determination (as it should be). As with recommeations I've made to you and anyone else, they're all based on my listening and specific taste/preference. I'm happy to hear that my previous recommendations to you have been very helpful.
Charles,

I don't mean sonically. Although mismatch can lead to severe sonic compromise or high hum level with sensitive speakers or something else.

Elrog is NOT a drop in replacement. Its specs are NOT compliant with WE's specs, like its plate resistance as one example. What's more important is that there is a proven case which I reported where Elrogs did not work, precisely due the fact that they are not drop-in replacement. For example, they might NOT work with 2 of my 3 300B amplifiers with my sensitive speakers.
Now I know they will work in Frankenstein MK2 but this is 33% success rate in my case. For some people with one amplifier it'll be 100%, for some 0%. Takatsuki to my knowledge has had no such problems so far. They might, but so far I don't know of any such cases.
That's the difference between them.

Online research will lead anyone interested to datasheets of Elrog, original WE's, Takatsuki. Also, there are discussions regarding how some 300B tubes should not be even called 300B tubes. This is all theoretical until it actually does cause problems. All I did is reported a case where it did in practice. And it's very relevant to me and owners of 300B amps.
I can't say yet what it is that causes this amp-tube mismatch. I know of other so called 300B tubes that occasionally have mismatch problems so this is not unique. What I do know now is that Elrog is among them. This is the reason I interfered in this thread. It could be helpful for some.

Dmarkov, I think you do us all a service by issuing a word of caution. Not everyone has the luxury of running expensive experiments. For those who are not in a position to roll the dice on a pair of 1K tubes, it may be well to carefully consider your words. For those that are in such a position, I say go for it.

Optimizing anything related to top tier audio is far from simple. If it were simple, we would all be doing the same thing. Consideration of the physics is alway a great place to start. But it is just a start.

I rolled the dice on the Elrogs pairing with my Frankensteins. It was a risk for sure, given Charles previous experience with, and praise for, the Franks driven by both the Taks and the EMLs. Had the experiment not gone well, I would have kicked myself for not going the safe route, which would have been acting on Charles previous experience and just ordering a pair of Taks. As it turned out, I was intrigued by the novel approach of Elrog, acted on that interest, and was pretty much blown away with the Elrogs right out of the box. I have been far more effusive than is normal in my recommendation of the Elrog 300Bs. For reference, see my caution regarding the Psvane 101D replicas vs the Psvane HiFi series.

Charles had the good fortune to audition a pair of Elrog 845s in a friends system, and based on that, he rolled the dice on the Elrog 300Bs as well.

If you have followed Rebbi's threads regarding driving his Ref 3A deCapos with a low power SET, you have seen caution issued by one of this forums most technically astute contributors, Almarg, with this pairing. After Rebbi's "satisfaction" with said pairing, he provided another astute set of observations that provided some basis in physics for why this pairing may indeed work.

As we used to say back in the chemistry lab, sometimes you just have to stop talking and run the d@Mn experiment.

There is another aspect that impacts all of us. The big gambler was the innovator who took a huge risk both in terms of money buy also in terms of the opportunity cost, i.e. the folks at Elrog. No one is going to take the risk of underwriting the cost of R&D, not to mention product launch, if we as consumers become overly risk adverse and won't try their products. We have to take some risk as well. The NOS well is running dry. The people with actual experience from the golden age of the 50's and 60's won't be with us much longer. It behoves us all to seize the moment.

I say folks try the tubes. If you don't like them, sell them.