@rocray WOW! The Sylvania 6by5 rectifier is also 4" tall. Luckily the linestage has tubes on the top instead of in a box. Thanks for the measurements. Was going to space the Salamander rack shelves further apart anyway.
@lowrider57 thanks for the tube profiles. They are the only 6SN7 I have, and had no idea where they stood sonically. It will be interesting to hear the comparison.
Thanks,
aldnorab