Not much, apart from a growing stock of old NOS tubes for my Zana Deux.
List of my 6SL7 type tubes:
Brimar 6SL7GTY Brown Base w/white printing on base
Brimar 6SL7GT Black Base w/white printing on base
Brimar 6SL7GT Black Base w/white printing on glass
Brimar CV1985 Brown Base w/white printing on base
Mullard ECC35 Short, brown base "Tall Boy"
Mullard ECC35 Brown base w/yellow printing on glass
Adzam ECC35 Short, brown base "Tall Boy"
Swedish Standard Radio 33S29B (Haltron rebranded)
Valvo 6SL7GT (Hamburg 1957)
Tung Sol 6SU7GTY Brown Base w/black glass
Tung Sol 6SL7GT Black Base w/black glass
Ken Rad 6SL7GT VT-229
Sylvania JAN-CHS 6SL7GT VT-229
"Stupidity got us into this mess - and stupidity will get us out." - Homer SOURCE Ontech Monster Dual Mono AMP EC Zana Deux HEADPHONES Sennheiser HD800 w/LD Hyperion, HD650 w/SAA Equinox, Grado RS-1, Victor/JVC HP-DX1000 CABLES Zu Gede, Zu Firemine