Thanks Cee Tee. I'll take a look at both. I don't know if I can afford running seven 6SN7s for the EC
Here's a pic of my main NOS/NIB 6SN7 collection. It's about 20% of my NOS 6SN7 collection, but the tubes in this case are honestly holy grails and took forever to assemble, especially in NIB condition.
The tubes in this briefcase (from top left to bottom right):
Neotron 6SN7GT round plates (France)
Brimar CV1988/6SN7GTY
Philips Miniwatt 6SN7GT
Ken Rad VT-231 black glass
Raytheon VT-231 "type 1" flat plates
Sylvania 6SN7W short bottle
Sylvania 6SN7W tall bottle
Sylvania 6SN7W metal base
Sylvania VT-231
Tung Sol VT-231 round plates (narrow box)
CBS/Hytron JAN-CHY-5692
RCA VT-231 (1943)
National Union CNU-6SN7GT gray glass
Sylvania CHS-6SN7WGT
Hytron 6SN7GT (retail box)
AWA Radiotron 6SN7GT (Australia)
Raytheon 6SN7WGT (retail box)
Sylvania 6SN7GT true 1952 Bad Boys (retail box)
National Union 6SN7GT black glass (retail box)
National Union 6SN7GT gray glass (retail box)
RCA 5692 red base (retail box)
*** not original box but mega rare *** Swedish Standard 33S30B NOS
Tung Sol 6SN7GT round plates (fat retail box)
Tung Sol CTL-6SN7GT round plates (fat mil box)
Marconi B65 gray glass metal base
Mullard ECC32 (ok, not a 6SN7 but close)
Telefunken 6SN7GTA (original tape-sealed boxes ... have opened others to confirm contents)