Hi, This is my first post on ak, but certainly not my last. Today I received a nice Fisher X-100-3 in the mail, and as is typical with the US mail it was damaged. One of the original quad of Mullard 7189s was broken, and the other three were rattling around in the box. Right now I'm running the three remaining Mullards and a GE 7189 I had lying around. So, I hopped on eBay, and found a cheap quad of vintage Russian 6P14P-EVs. These seem to be a drop in replacement with the same specs as the 7189 (cant use el84s, this amp has waaay too much plate voltage) I am a little bit wary of these, as I haven't heard great things about other Russian tubes. Has anyone tried these tubes? are they any good or would I be better off with the mishmash I currently have? Any opinions are greatly appreciated!