I've been collecting pieces to build a monoband 160m amplifier using a GS-35B. I have most of the other parts but it's about time to put a tube in my mitts. Aside from a certain well-known auction site, is there anywhere else to purchase the tube? If via auction only, can anyone recommend for (or against) a particular seller(s)? tnx es vy 73, Bryan WA7PRC