Coincident Frankenstein mk.2 amps

tswisla,
I understand your comfort in going with Israel’s recommendation as you have established a level of trust and confidence with him. I’ve never had any problems with him x 10 years, simply none. So I believe you’d be happy with his preferred Psvane.

I’d suggest getting in touch with tubesusa.com. The owner George is a very long time EML dealer and has sold them to  owners of a multitude of different 300b amplifiers. He is a source of considerable knowledge and experience. The EML XLS is just fabulous in the Frankenstein.
Charles

@tswisla What do you want more or less of with the tube upgrade?  Perhaps some talk of that will help folks help you make the decision...

I'll be honest, I love what I am hearing.  At the same time, I always am surprised and love to hear improvements.  I mainly want to be sure that the EMLs are a good match for the Franks before I splurge.  

I think all the tubes you're considering are a good match, but they also will change the sound in different ways. If you want a bit more of a mellow, vintage sound, then try the psvane, if you want more frequency extension and imaging precision, try the eml.  And ideally, try them both.

One caveat is that both Charles and I have tried both tubes and settled on the eml. In my experience, Charles has good ears and makes great recommendations. We also had similar speakers though (coincident super/total eclipses).

I have been tormented over this decision for months now.  EML XLS, Elrog, Psvane Acme or ?.  Israel has been right every time so far, so I am taking his advice.  I am ordering a pair of Acmes.  He claims they are the best for the Franks.  I will report back!