What are some tweaks you've been curious about?

[tin ear]

I guess this is more of a mod than a tweak.

I probably haven't had my Dynaco ST70 a month yet, but today I am starting assembly of a SDS Labs capacitor board for it. It may be because I'm not really an electronics nerd, but the instructions that came with the board seem a bit terse. So this may take a while, making sure I do everything right.

MEMO TO SELF:
Before buying, much less assembling, mods for a piece of used equipment, first open up said used equipment to see if it has already been modded.

[JoeE SP9]

Most of those tube sox devices should only be used on small signal tube 12XXXX etc. There are only a few that can be used on output tubes. Be careful good EL34's ain't cheap! Good tubes are an investment you might want to consider once you've done all your mods.