I've got another tube amp on the way, I think it's time to double down on the watts. I can move my EL84's and a single 12ax7 from my current amp over to the new amp. The new amp also takes two 12at7's, I believe the originals are Electro Harmonix. I haven't heard them, but from other EH tubes I've heard I'm betting there are reasonably priced replacements that outperform the EH's. Anyone rolled 12at7's and have opinions on their characteristics? Not looking to buy any soon, there's always a chance the amp doesn't meet expectations and gets sent back.