Anyone prefer EL34 over 300B?

Atmasphere is spot on regarding sensitivity.  Check out the SPL rating of every Tekton speaker conducted by Stereophile.  They always show a noticeable reduction in the actual SPL rating vs. reported.  

This doesn't make the speakers bad in any way, it just means you need a bit more oomph to drive them.  I am not sure you need 60-100 watts for music listening.  In most rooms 50w will deliver 105dB of output and 25dB will give you 102 dB at 10' from the listening position.  

I don't think a 300B SET will deliver what you are looking for.   A 300B parallel SET delivering 16 to 18w might be enough but that is cutting it close with 100dB of output.   I think some higher powere SETs using 520Bs, 845s or ever 1605s will get you the output you need.  THe 520B and 1605 will be closer to a 300B while an 845 is just more linear and is not going to be your liking most likely.  

The thing about SETs is that if you really want to hear what they are all about, you will want to use a speaker that is efficient enough that the amp is never run past about 20% of full power. Otherwise the amp will take on a 'dynamic' character caused by higher ordered harmonic distortion masquerading as 'dynamics'.

Thank you all for your input. I will not be in a rush to try a 300B amp.  The present amp is sound so very good and I'm beginning to believe that with my present speakers the 300B might well be no improvement.