Well, I've been lucky enough to have just purchased one of my grail amp's. Uberschall Rev. Green #339 (▲▲ lightning bolt.). Best amp I have ever played! Has a new matched set of JJ el34's, and the preamp tubes are (1-6) toung-sol, 12ax7b china, 12ax7b china, 12ax7a JoLida, 12ax7 Holland, 12ax7eh. I asked the previous owner about the pre-amp tube selection, and he got the amp as it is today (excluding the new set of power tubes he did a few months back). Right now, I'm just getting to know it and really dig those low mids! I may play with moving some tubes around once i get to know it better. I know this is an older thread but lots of good info for a person new to the older ubers.
There’s an early rev blue local to me with the symbol serial that I’m seriously considering picking up. Would that be the closest bridge to a rev green? I hear good things but I don’t want to shell out for a rev green.