I spent $750 on glass in the last couple of weeks..... no way my gear will be boat anchors in my lifetime.... fortunately I paid pre embargo prices. I bought a replacement set of tubes for my headphone amp, 2 sets for my mono amps, 2 sets for my pre., a back up spare 12at7 for my back up preamp..... yesterday I bought 4 pair input tubes for a 300b I having built for a total of 8 pair.... 8 rectifiers.... should have all the bases covered for a while.