Hi all, I know I'm probably unearthing a subject that's been dead and buried for a while. But the other day, under the influence of alcohol, I purchased 4 6bl7 tubes. So now I want to use them... can anyone confirm that it's safe to use quad 6bl7 in the elise, with 6sn7 as drivers? I looked around but saw a few conflicting or unclear statements, so wanted to check. Thanks, Rich.