OK so let me see if I got this right. You're comparing 4 tubes - all of them the regular size for the Ember, and one being the 6SN7 type.
- Sylvania 6SN7: wider soundstage and more air to the treble. Clean and clear with deep, tight & full bodied bass, but
recessed mids and treble roll off.
- Telefunken: more lush than the Sylvania 6SN7
- Amperex: sharper on both ends of the FR than Sylvania 6SN7
- Bugle Boy: impactful bass, extended & organic treble.
To me it sounds like a possible case of new product jitters or whatever that's called, where you want to find a reason your new product is superior to justify the purchase - and as if just maybe, if you do a blind test, then perhaps you would be happier with the Bugle Boy... but that's all based off your review and from not having tried these yet. That would be interesting to hear another comparison between those two. Also, which type of Sylvania 6SN7, and which type of Bugle Boy was that? (the 6DJ8 maybe)? thanks man