Sylvania BADBOY 6SN7GT ,not so much in bass quantity BUT best in quality ,very nice bass control
My "Bad Boy" had good bass quantity when paired with a tung sol 5998. The detail and holographic soundstage were the best part of it to me. I liked it so much that even though I sold my 336i a year ago I wont sell my Bad Boy just in case I need it later.
95 pages is a lot to go through!
Is there a specific tube number for the front and for the back for the darkvoice 336i? There are a tonne of tubes for auction on ebay and apart from 6080 6snt etc I have no clue.
what happens if I buy a wrong tube? will it not fir or poke a whole in the universe?
6SA7 (S first, then A) will definitely NOT work. totally different tube from 6AS7 (A first, then S).
6SD7 - also not usable.
The first one and the last two on your list seem to be good, although it doesn't say what brand they are (no clue what "TRAV-LER" is - maybe some kind of rebrander - there were a lot of rebranders back in the day - in the USA, almost all tubes were made by GE, RCA, Sylvania, Raytheon, Tung-Sol, Western Electric, and Ken-Rad. Even "big names" like Westinghouse were 100% rebranders of the others' tubes.
I have never seen an amp that uses a 6SA7 - it's said to be a "Pentagrid Converter" type - I don't even really know what that means - but it isn't a dual-triode like the 6AS7, or even a pentode, or rectifier tube...
The 6SD7 is a pentode, slightly (but not usably) similar to the 6SJ7 used in the DV337 - but again, not possible to use in the 337.
So no - I would say those tubes are headed for the trash heap.