6188 (aka 6SU7GT) Philips JAN Vacuum Tube - Super Military 6SL7  NOS/USA
recommended by audio enthusiasts to upgrade normal 6SL7 for HighEnd HiFi.

Duo-Triode for octal / 8-pin socket

These military grade, Joint Army Navy (JAN) vacuum tubes are never used and in the original box. This listing includes many hard to find tubes from manufacturers like Philips, GE, Sylanvia, Raytheon, and more. Due to an ever increasing demand plus a dwindling supply of N.O.S. (new old stock) vacuum tubes worldwide, these Mil-Spec tubes have limited availability

Recomendations for 6188 / 6SU7GT (a 'super-audio' 6SL7GT) NOS / USA: Tubes: Odd Ball [6SL7-C] 6SL7GT (C) (aka 6N9 / 6Н9П) 6SL7GT (aka 6N9 / 6Н9П) with beautiful brown base 14,00 Euro [6SL7-SOV] 6SL7GT (R) (aka 6N9 / 6Н9П) Double Triode 6SL7GT (aka 6N9 / 6Н9П) made in Russia (NOS) 9,60 Euro [s6SN7] 6SN7WGTA General Electric NOS 6SN7WGTA light brown base,  GE/JAN side O-getter very rare version in original military boxes date code: 1968-1970 LIMITED SUPPLY! 69,00 Euro [s6SN7-SYL] 6SN7WGTA / 6SNGT Sylvania/USA brown base NOS 6SN7WGTA brown base,  Sylvania/USA  JAN date code: 1964 -1972 This type indicates a military spec tube that was not made for consumer use. These usually have extra support... 49,20 Euro [s6SN7-SYL2] 6SN7WGTA / 6SNGT Sylvania/USA, black base NOS 6SN7WGTA black base,  Sylvania/USA  JAN date code: 1974-1979 This type indicates a military spec tube that was not made for consumer use. These usually have extra support... 39,50 Euro 39,50 Euro [s6SN7-TFK] 6SN7WGTA Telefunken, made in Sweden as 33S30B NOS 6SN7WGTA Telefunken, made in Sweden as 33S30B VERY LIMITED SUPPLY! Made in Sweden by Standard Radio under RCA's licence (1950s).  Dark brown base, Muddy black plate marked with white ink... 174,00 Euro Tung Sol Tubes [NN096] Tung-Sol 6SL7GT Electron Tube Tung-Sol 6SL7GT manufacturer description: "The best current production 6SL7 available.  NOS performance and sound at a fraction of the price.  Sweeten up the preamp section of that Vintage... 14,90 Euro NOS Rare & Vintage [sECC82-SIE] ECC82 Siemens / NOS ECC82 Siemens NOS, original boxed Siemens AG Munich date codes 84-86 18,00 Euro [sECC82-TFK1] ECC82 Telefunken / NOS ECC82 Telefunken / made in E.Germany NOS, original boxed Telefunken 24,00 Euro [sEL34] EL34 Siemens NOS EL34 Siemens  NOS from RFT (E.Germany) production original Siemens boxed, all from same production batch The Siemens EL34 is just about as close as you can come to NOS Mullard. They have a very... 69,00 Euro