Tubes for base

yep.. It's subering time.

Tubes will never give you what a sub will.

Period.

All your base are belong to us.

If any in your gear are possibly made by Amperex or Tungsol... try those.

Tubes wont make a good bases.
I tried to make an amp stand from tubes- not a good base idea.

I have to agree with the subwoofer idea - and I DO hear subs, actually can hear down to 25 hz easily (high end is a different problem).

Having said that, I just replaced some Matsushita's in my Monarchy tube DAC and replaced them with Amperex (Holland) 6DJ8's. I do notice an increase in bass response, and also a slight rolloff of high frequencies. The tubes are new so that may change. My experience is that some tubes do favor bass.