Techboy57
Inspired
EL34, 6CA7, and KT77 are equivalent tubes. EL34 is designed by Mullard, 6CA7 by Sylvania and the KT77 by M O V of England can also be used and sound excellent, I have a pair of KT77's in my Boogie MkIIC+ and they sound awesomeI saw that video, but I missed the "E" reference. That said, I don't think that's correct ? Both John Suhr and Dave Friedman say that they were 6CA7 tubes ..., which I believe are a direct replacement for EL-34's ....
If you search "Eddie 6EA7 Tubes" you barely get any hits ....
If you search "Eddie 6CA7 Tubes" and you get pages and pages ....
https://humbuckersoup.com/tubes/el34-vs-kt77-tubes-difference/
https://humbuckersoup.com/tubes/el34-vs-6ca7/
https://books.google.ca/books?id=E9...age&q=Which company designed the KT77&f=false