Is it true that the only difference between a 5755 tube and a 12ax7 tube is that the pins are in different places ... ?
I am thinking about getting a socket converter and trying out some 5755s in my Ming Da MC84-C07 ... but I love my little Ming Da and don't want to give it a headache or worse ! I really don't want to fry it ! 
So please tube gurus of Head-Fi share some knowledge with me about this idea ...
Many thanks in advance ... sincerely.





