Loving the Whammer!
Currently running some NOS Sylvania "spring top" tubes, gives it a little more bass than the stock JJ. I also tried some NOS RCA single plates, which were awesome, but I wanted to save them (not sure why) and feel that the Sylvania's are not really a step back at all. I also snatched a pair of NOS Sylvania "Green Leaf" tubes, that Pat recommended, but I haven't tried them yet. The NOS market is tight, so if you can find a good set of tubes, grab them.