New tubes will change the sound but maybe not as you like. You should try changing your gain tubes first with NOS telefunken or mullards and see if that is going the right direction. Many times you will get better sound with these than new tubes. If that works, then spend the real money on NOS output tubes. It's a lot easier to spend $75 for a pair of 12ax7s than $300 on EL34s and realize it didn't help.
If you get some well used/almost dead older telefunkens, you may get to experience the real tubey sound you thought you were looking for. After about an hour you will realize that that is a "microphonic" almost echo that is just too much.
Good Luck
If you get some well used/almost dead older telefunkens, you may get to experience the real tubey sound you thought you were looking for. After about an hour you will realize that that is a "microphonic" almost echo that is just too much.
Good Luck