Par3n1- I don't know the mk2, but I believe the previous version used photoflash caps for the main B+. If you want better solidity and low-end authority, I'd replace these with Elna or WKZ Blackgates ($$$) with copper foil-in-oil or Rel Multicap bypass caps. Should make a very nice improvement. Then check on the signal coupling caps. Again, copper foil-in-oils (or Auric if you prefer film types)should provide a nice improvement depending on what caps Roger M. installed originally. Also, the B+ caps for the gain and driver stages will likely provide an even bigger benefit from upgrading/improving.
Power cord upgrade should definitely be considered if you're thinking about going this far with the mods. Hope there's adequate space to fit it all in!!! Good luck.
