On another note, I have one Cetron 572B that was pulled out of an FL-2100 and never had its anode cap correctly soldered. It's essentially brand new while it's neighbor suffered a very punishing life doing the work of two tubes. Anytime I've tried to get it to play nicely with a partner, it's tried to hog the majority of the work and cherries its plate red before its partners. I mentioned this in case someone has one brand new Cetron, I may have your match...