I'm thinking of replacing the tubes in my Fargen Micro Plex. Right now it has a JJ EL34 and a Sovtek 12AX7. It sounds okay with these but I've never replaced the tubes - they're probably about 2 years old. I want low noise, reliable tubes. Based on the information I see on The Tube Store: For the 12AX7 I was looking at a Svetlana 12AX7 For the EL34 I was looking at a Tung-Sol EL34B (are these the Tung-Sol reissues?) or Svetlana EL34 I can use EL34/KT66/KT77/6550/6L6/5881/6V6 with no re-biasing. Any opinions or advice?