6SN7GTB replacement

Hello, friends, I have a canary audio M 600 fitted with the 6SN7GTB reissue TungSol can I replace them with just the 6SN7 GT

jasbirnandra05-22-2020 8:54am

lowrider57 Details Discussions Posts This discussion Message User 5,417 posts 05-22-2020 at 03:28pm Copy Comment URL Report Comment Edit Delete You should ask the manufacturer or a dealer. Typically, you can't substitute a 6SN7GT in a circuit designed for the 6SN7GTB. The plate voltage is higher in the GTB (450V) vs. 350V for a GT, so the biasing would be different.
atmasphere Details Discussions Posts This discussion Message User 11,841 posts 05-22-2020 at 05:03pm Copy Comment URL Report Comment Edit Delete If a modern 6SN7GT like the Chinese Shuguang, yes, you can as even though they are marked as GTs, they are spec'ed more like GTBs and we've been using them that way for over 20 years with no worries. Don't do that with any of the boutique Chinese tubes like the Psvane- they are actual GTs.
dekay Details Discussions Posts This discussion Message User 5,597 posts 05-23-2020 at 12:00am Copy Comment URL Report Comment Edit Delete Thought the GT was rated as 300V (not 350V) maximum plate voltage. Bigger difference than 350V. There is an "old" production 6SN7 rated @ 450V, but I do not recall the "after" 6SN7 "letters". Again, as mentioned, it depends upon the circuit design. DeKay