Excuse my ignorance, but what does that mean? If I were to do that (once I understand what the &$%# you're talking about) what would it cost, and how would I do it?
he just changed the preamp tube...
no very spendy at all
$20.00 or so a pair
here is a good place to start...
http://www.eurotubes.com/index.htm
his start at $7.50 for ecc83's....
if you have any questions, call them and they are more then happy to answer ANY questions you may have....