Listened to the Columbia Legacy re-master of the first Santana album/disc. WeeeeeeSquirrel Darkvoice 336SE w/Svetlana 6H13C and RCA 6SN7GTB.
A pleasant surprise. Zero grain in the vocals, very driving articulate bass and a veritable "raging conduit" of '70s Rock-n-Roll detail. The lead guitar had bright moments, but that's the way Carlos had it tuned/amped.
+1 for the T1. : )
Glad you found a recording you like the T1! Let us know as your attitude towards them evolves (or doesn't).