I got my CJ PV12 modded at RHB Sound Dezign. I can't comment on the PV12 vs the ET3, but I can say that in my view, if you have a PV12 you absolutely must get it modded (either at RHB or elsewhere), because in stock form, the tone is beautiful but the soundstage is very flat, like a 2-dimensional wall of sound just behind your speakers. Their newer PV10-B fixed this, adding depth, but neither the 10 nor the 12 has particularly fast bass. The RHB mod that I did first was their power supply. It's well under $1000 so I expect that you could not find a used ET3 for a similar price. It totally transformed my PV-12. They also do mods that will improve tonality, but this is not where the PV12 needs help in my opinion. Good luck.
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Did you get your mod done? How'd it go?
I was in the same situation as you and at the time of your posting I opted for the ET3. After a year of comparing the strengths of these two preamps I couldn't let go of either so I decided I'll soon be modding the PV-12.
These are the guys I found who will mod the PV-12.