Sure, keep in mind i just got the Sylvanias and the Kenrads, so with those i have only 10 minutes of listening impressions.
Sylvania 6SN7GTB Short Bottle - Good warmth, not the best treble extension on first glance, should be nice with the WE's to get the 1266 running. Nice midbass kick. One of the tubes makes harsh noises for one minute while warming up, luckily completely silent after that.
Kenrad VT-231 - Separation, details, soundstage from the very first impressions. They also seem to slam a very good amount. Mids seem nice but not the focus. No idea how they compare to the other technical tubes just yet.
Brimar CV1988 - Super sweet mids and highly resolving. Pure honey, top tier!
Melz1578 - Most detailed and separation i got, insane with MO's. No warmth. They slam like a truck.
TungSol Round Plate - Just behind Melz in technicalities. Mids are also very good but not Brimar sweetness. Probably the best allrounder tube i got.
Electro Harmonix Gold New Stock: Nice mids, you don't sacrifice too much details, highly recommended for the price.
PSVane Globes: Neutral, slightly U-shaped, very good extension, more solid state sounding, goes for technicalities and not musicality. Probably similiar to other Gold PSVanes. Shame about the slight imbalance, i will try to swap them out...
Thanks!
Check out
Deyan here at head-fi, he makes them, not expensive either, very useful if you roll tubes on an (almost) daily basis.