What's the difference between Sylvania's with Red and Yellow Print???

[StratStringSlinger]

I was wondering what the difference between Sylvania's with red and yellow print? I have some sets of 6L6GC's. One pair has yellow print. Anyone with insight into this? Are they the same design/manufacture? Also, if they happen to draw the same current can I make a quad out of them? Thanks!

http://i581.photobucket.com/albums/ss257/WayneLiao/Vacuum%20Tubes/IMG_0368.jpg

[MartyStrat54]

They're very close, but were made in different years. As long as they are 6L6GC's and they are 8mA or closer to each other, yes you can make a quad out of them. Those older Sylvania's are great sounding tubes. I use Sylvania 6CA7's and they are awesome. Those are called, "Fat Boys" BTW.

[schmidlin]

Nice tubes. Lucky you :)

[Dan S]

Color.

[StratStringSlinger]

Thanks. So that's it huh? Sometimes with tubes the most subtle differences warrant a huge difference in value but I guess in this case it's just a different color print!?

[SamBooka]

Yeah.. but dont make that assumption with Fender/Groove tubes. Colour DOES matter.